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	/*
	* Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	package javax.swing;

	import java.awt.*;
	import java.awt.event.*;
	import java.beans.*;
	import java.io.*;
	import java.util.*;
	import javax.swing.event.*;
	import javax.swing.plaf.*;
	import javax.swing.tree.*;
	import javax.swing.text.Position;
	import javax.accessibility.*;

	import sun.awt.AWTAccessor;
	import sun.awt.AWTAccessor.MouseEventAccessor;
	import sun.swing.SwingUtilities2;
	import sun.swing.SwingUtilities2.Section;
	import static sun.swing.SwingUtilities2.Section.*;


	/**
	* <a name="jtree_description"></a>
	* A control that displays a set of hierarchical data as an outline.
	* You can find task-oriented documentation and examples of using trees in
	* <a href="https://docs.oracle.com/javase/tutorial/uiswing/components/tree.html">How to Use Trees</a>,
	* a section in <em>The Java Tutorial.</em>
	* <p>
	* A specific node in a tree can be identified either by a
	* <code>TreePath</code> (an object
	* that encapsulates a node and all of its ancestors), or by its
	* display row, where each row in the display area displays one node.
	* An <i>expanded</i> node is a non-leaf node (as identified by
	* <code>TreeModel.isLeaf(node)</code> returning false) that will displays
	* its children when all its ancestors are <i>expanded</i>.
	* A <i>collapsed</i>
	* node is one which hides them. A <i>hidden</i> node is one which is
	* under a collapsed ancestor. All of a <i>viewable</i> nodes parents
	* are expanded, but may or may not be displayed. A <i>displayed</i> node
	* is both viewable and in the display area, where it can be seen.
	* </p>
	* The following <code>JTree</code> methods use "visible" to mean "displayed":
	* <ul>
	* <li><code>isRootVisible()</code>
	* <li><code>setRootVisible()</code>
	* <li><code>scrollPathToVisible()</code>
	* <li><code>scrollRowToVisible()</code>
	* <li><code>getVisibleRowCount()</code>
	* <li><code>setVisibleRowCount()</code>
	* </ul>
	* The next group of <code>JTree</code> methods use "visible" to mean
	* "viewable" (under an expanded parent):
	* <ul>
	* <li><code>isVisible()</code>
	* <li><code>makeVisible()</code>
	* </ul>
	* If you are interested in knowing when the selection changes implement
	* the <code>TreeSelectionListener</code> interface and add the instance
	* using the method <code>addTreeSelectionListener</code>.
	* <code>valueChanged</code> will be invoked when the
	* selection changes, that is if the user clicks twice on the same
	* node <code>valueChanged</code> will only be invoked once.
	* <p>
	* If you are interested in detecting either double-click events or when
	* a user clicks on a node, regardless of whether or not it was selected,
	* we recommend you do the following:
	* </p>
	* <pre>
	* final JTree tree = ...;
	*
	* MouseListener ml = new MouseAdapter() {
	* public void <b>mousePressed</b>(MouseEvent e) {
	* int selRow = tree.getRowForLocation(e.getX(), e.getY());
	* TreePath selPath = tree.getPathForLocation(e.getX(), e.getY());
	* if(selRow != -1) {
	* if(e.getClickCount() == 1) {
	* mySingleClick(selRow, selPath);
	* }
	* else if(e.getClickCount() == 2) {
	* myDoubleClick(selRow, selPath);
	* }
	* }
	* }
	* };
	* tree.addMouseListener(ml);
	* </pre>
	* NOTE: This example obtains both the path and row, but you only need to
	* get the one you're interested in.
	* <p>
	* To use <code>JTree</code> to display compound nodes
	* (for example, nodes containing both
	* a graphic icon and text), subclass {@link TreeCellRenderer} and use
	* {@link #setCellRenderer} to tell the tree to use it. To edit such nodes,
	* subclass {@link TreeCellEditor} and use {@link #setCellEditor}.
	* </p>
	* <p>
	* Like all <code>JComponent</code> classes, you can use {@link InputMap} and
	* {@link ActionMap}
	* to associate an {@link Action} object with a {@link KeyStroke}
	* and execute the action under specified conditions.
	* </p>
	* <strong>Warning:</strong> Swing is not thread safe. For more
	* information see <a
	* href="package-summary.html#threading">Swing's Threading
	* Policy</a>.
	* <p>
	* <strong>Warning:</strong>
	* Serialized objects of this class will not be compatible with
	* future Swing releases. The current serialization support is
	* appropriate for short term storage or RMI between applications running
	* the same version of Swing. As of 1.4, support for long term storage
	* of all JavaBeans™
	* has been added to the <code>java.beans</code> package.
	* Please see {@link java.beans.XMLEncoder}.
	*</p>
	* @beaninfo
	* attribute: isContainer false
	* description: A component that displays a set of hierarchical data as an outline.
	*
	* @author Rob Davis
	* @author Ray Ryan
	* @author Scott Violet
	*/
	@SuppressWarnings("serial")
	public class JTree extends JComponent implements Scrollable, Accessible
	{
	/**
	* @see #getUIClassID
	* @see #readObject
	*/
	private static final String uiClassID = "TreeUI";

	/**
	* The model that defines the tree displayed by this object.
	*/
	transient protected TreeModel treeModel;

	/**
	* Models the set of selected nodes in this tree.
	*/
	transient protected TreeSelectionModel selectionModel;

	/**
	* True if the root node is displayed, false if its children are
	* the highest visible nodes.
	*/
	protected boolean rootVisible;

	/**
	* The cell used to draw nodes. If <code>null</code>, the UI uses a default
	* <code>cellRenderer</code>.
	*/
	transient protected TreeCellRenderer cellRenderer;

	/**
	* Height to use for each display row. If this is <= 0 the renderer
	* determines the height for each row.
	*/
	protected int rowHeight;
	private boolean rowHeightSet = false;

	/**
	* Maps from <code>TreePath</code> to <code>Boolean</code>
	* indicating whether or not the
	* particular path is expanded. This ONLY indicates whether a
	* given path is expanded, and NOT if it is visible or not. That
	* information must be determined by visiting all the parent
	* paths and seeing if they are visible.
	*/
	transient private Hashtable<TreePath, Boolean> expandedState;


	/**
	* True if handles are displayed at the topmost level of the tree.
	* <p>
	* A handle is a small icon that displays adjacent to the node which
	* allows the user to click once to expand or collapse the node. A
	* common interface shows a plus sign (+) for a node which can be
	* expanded and a minus sign (-) for a node which can be collapsed.
	* Handles are always shown for nodes below the topmost level.
	* <p>
	* If the <code>rootVisible</code> setting specifies that the root
	* node is to be displayed, then that is the only node at the topmost
	* level. If the root node is not displayed, then all of its
	* children are at the topmost level of the tree. Handles are
	* always displayed for nodes other than the topmost.
	* <p>
	* If the root node isn't visible, it is generally a good to make
	* this value true. Otherwise, the tree looks exactly like a list,
	* and users may not know that the "list entries" are actually
	* tree nodes.
	*
	* @see #rootVisible
	*/
	protected boolean showsRootHandles;
	private boolean showsRootHandlesSet = false;

	/**
	* Creates a new event and passed it off the
	* <code>selectionListeners</code>.
	*/
	protected transient TreeSelectionRedirector selectionRedirector;

	/**
	* Editor for the entries. Default is <code>null</code>
	* (tree is not editable).
	*/
	transient protected TreeCellEditor cellEditor;

	/**
	* Is the tree editable? Default is false.
	*/
	protected boolean editable;

	/**
	* Is this tree a large model? This is a code-optimization setting.
	* A large model can be used when the cell height is the same for all
	* nodes. The UI will then cache very little information and instead
	* continually message the model. Without a large model the UI caches
	* most of the information, resulting in fewer method calls to the model.
	* <p>
	* This value is only a suggestion to the UI. Not all UIs will
	* take advantage of it. Default value is false.
	*/
	protected boolean largeModel;

	/**
	* Number of rows to make visible at one time. This value is used for
	* the <code>Scrollable</code> interface. It determines the preferred
	* size of the display area.
	*/
	protected int visibleRowCount;

	/**
	* If true, when editing is to be stopped by way of selection changing,
	* data in tree changing or other means <code>stopCellEditing</code>
	* is invoked, and changes are saved. If false,
	* <code>cancelCellEditing</code> is invoked, and changes
	* are discarded. Default is false.
	*/
	protected boolean invokesStopCellEditing;

	/**
	* If true, when a node is expanded, as many of the descendants are
	* scrolled to be visible.
	*/
	protected boolean scrollsOnExpand;
	private boolean scrollsOnExpandSet = false;

	/**
	* Number of mouse clicks before a node is expanded.
	*/
	protected int toggleClickCount;

	/**
	* Updates the <code>expandedState</code>.
	*/
	transient protected TreeModelListener treeModelListener;

	/**
	* Used when <code>setExpandedState</code> is invoked,
	* will be a <code>Stack</code> of <code>Stack</code>s.
	*/
	transient private Stack<Stack<TreePath>> expandedStack;

	/**
	* Lead selection path, may not be <code>null</code>.
	*/
	private TreePath leadPath;

	/**
	* Anchor path.
	*/
	private TreePath anchorPath;

	/**
	* True if paths in the selection should be expanded.
	*/
	private boolean expandsSelectedPaths;

	/**
	* This is set to true for the life of the <code>setUI</code> call.
	*/
	private boolean settingUI;

	/** If true, mouse presses on selections initiate a drag operation. */
	private boolean dragEnabled;

	/**
	* The drop mode for this component.
	*/
	private DropMode dropMode = DropMode.USE_SELECTION;

	/**
	* The drop location.
	*/
	private transient DropLocation dropLocation;

	/**
	* A subclass of <code>TransferHandler.DropLocation</code> representing
	* a drop location for a <code>JTree</code>.
	*
	* @see #getDropLocation
	* @since 1.6
	*/
	public static final class DropLocation extends TransferHandler.DropLocation {
	private final TreePath path;
	private final int index;

	private DropLocation(Point p, TreePath path, int index) {
	super(p);
	this.path = path;
	this.index = index;
	}

	/**
	* Returns the index where the dropped data should be inserted
	* with respect to the path returned by <code>getPath()</code>.
	* <p>
	* For drop modes <code>DropMode.USE_SELECTION</code> and
	* <code>DropMode.ON</code>, this index is unimportant (and it will
	* always be <code>-1</code>) as the only interesting data is the
	* path over which the drop operation occurred.
	* <p>
	* For drop mode <code>DropMode.INSERT</code>, this index
	* indicates the index at which the data should be inserted into
	* the parent path represented by <code>getPath()</code>.
	* <code>-1</code> indicates that the drop occurred over the
	* parent itself, and in most cases should be treated as inserting
	* into either the beginning or the end of the parent's list of
	* children.
	* <p>
	* For <code>DropMode.ON_OR_INSERT</code>, this value will be
	* an insert index, as described above, or <code>-1</code> if
	* the drop occurred over the path itself.
	*
	* @return the child index
	* @see #getPath
	*/
	public int getChildIndex() {
	return index;
	}

	/**
	* Returns the path where dropped data should be placed in the
	* tree.
	* <p>
	* Interpretation of this value depends on the drop mode set on the
	* component. If the drop mode is <code>DropMode.USE_SELECTION</code>
	* or <code>DropMode.ON</code>, the return value is the path in the
	* tree over which the data has been (or will be) dropped.
	* <code>null</code> indicates that the drop is over empty space,
	* not associated with a particular path.
	* <p>
	* If the drop mode is <code>DropMode.INSERT</code>, the return value
	* refers to the path that should become the parent of the new data,
	* in which case <code>getChildIndex()</code> indicates where the
	* new item should be inserted into this parent path. A
	* <code>null</code> path indicates that no parent path has been
	* determined, which can happen for multiple reasons:
	* <ul>
	* <li>The tree has no model
	* <li>There is no root in the tree
	* <li>The root is collapsed
	* <li>The root is a leaf node
	* </ul>
	* It is up to the developer to decide if and how they wish to handle
	* the <code>null</code> case.
	* <p>
	* If the drop mode is <code>DropMode.ON_OR_INSERT</code>,
	* <code>getChildIndex</code> can be used to determine whether the
	* drop is on top of the path itself (<code>-1</code>) or the index
	* at which it should be inserted into the path (values other than
	* <code>-1</code>).
	*
	* @return the drop path
	* @see #getChildIndex
	*/
	public TreePath getPath() {
	return path;
	}

	/**
	* Returns a string representation of this drop location.
	* This method is intended to be used for debugging purposes,
	* and the content and format of the returned string may vary
	* between implementations.
	*
	* @return a string representation of this drop location
	*/
	public String toString() {
	return getClass().getName()
	+ "[dropPoint=" + getDropPoint() + ","
	+ "path=" + path + ","
	+ "childIndex=" + index + "]";
	}
	}

	/**
	* The row to expand during DnD.
	*/
	private int expandRow = -1;

	@SuppressWarnings("serial")
	private class TreeTimer extends Timer {
	public TreeTimer() {
	super(2000, null);
	setRepeats(false);
	}

	public void fireActionPerformed(ActionEvent ae) {
	JTree.this.expandRow(expandRow);
	}
	}

	/**
	* A timer to expand nodes during drop.
	*/
	private TreeTimer dropTimer;

	/**
	* When <code>addTreeExpansionListener</code> is invoked,
	* and <code>settingUI</code> is true, this ivar gets set to the passed in
	* <code>Listener</code>. This listener is then notified first in
	* <code>fireTreeCollapsed</code> and <code>fireTreeExpanded</code>.
	* <p>This is an ugly workaround for a way to have the UI listener
	* get notified before other listeners.
	*/
	private transient TreeExpansionListener uiTreeExpansionListener;

	/**
	* Max number of stacks to keep around.
	*/
	private static int TEMP_STACK_SIZE = 11;

	//
	// Bound property names
	//
	/** Bound property name for <code>cellRenderer</code>. */
	public final static String CELL_RENDERER_PROPERTY = "cellRenderer";
	/** Bound property name for <code>treeModel</code>. */
	public final static String TREE_MODEL_PROPERTY = "model";
	/** Bound property name for <code>rootVisible</code>. */
	public final static String ROOT_VISIBLE_PROPERTY = "rootVisible";
	/** Bound property name for <code>showsRootHandles</code>. */
	public final static String SHOWS_ROOT_HANDLES_PROPERTY = "showsRootHandles";
	/** Bound property name for <code>rowHeight</code>. */
	public final static String ROW_HEIGHT_PROPERTY = "rowHeight";
	/** Bound property name for <code>cellEditor</code>. */
	public final static String CELL_EDITOR_PROPERTY = "cellEditor";
	/** Bound property name for <code>editable</code>. */
	public final static String EDITABLE_PROPERTY = "editable";
	/** Bound property name for <code>largeModel</code>. */
	public final static String LARGE_MODEL_PROPERTY = "largeModel";
	/** Bound property name for selectionModel. */
	public final static String SELECTION_MODEL_PROPERTY = "selectionModel";
	/** Bound property name for <code>visibleRowCount</code>. */
	public final static String VISIBLE_ROW_COUNT_PROPERTY = "visibleRowCount";
	/** Bound property name for <code>messagesStopCellEditing</code>. */
	public final static String INVOKES_STOP_CELL_EDITING_PROPERTY = "invokesStopCellEditing";
	/** Bound property name for <code>scrollsOnExpand</code>. */
	public final static String SCROLLS_ON_EXPAND_PROPERTY = "scrollsOnExpand";
	/** Bound property name for <code>toggleClickCount</code>. */
	public final static String TOGGLE_CLICK_COUNT_PROPERTY = "toggleClickCount";
	/** Bound property name for <code>leadSelectionPath</code>.
	* @since 1.3 */
	public final static String LEAD_SELECTION_PATH_PROPERTY = "leadSelectionPath";
	/** Bound property name for anchor selection path.
	* @since 1.3 */
	public final static String ANCHOR_SELECTION_PATH_PROPERTY = "anchorSelectionPath";
	/** Bound property name for expands selected paths property
	* @since 1.3 */
	public final static String EXPANDS_SELECTED_PATHS_PROPERTY = "expandsSelectedPaths";


	/**
	* Creates and returns a sample <code>TreeModel</code>.
	* Used primarily for beanbuilders to show something interesting.
	*
	* @return the default <code>TreeModel</code>
	*/
	protected static TreeModel getDefaultTreeModel() {
	DefaultMutableTreeNode root = new DefaultMutableTreeNode("JTree");
	DefaultMutableTreeNode parent;

	parent = new DefaultMutableTreeNode("colors");
	root.add(parent);
	parent.add(new DefaultMutableTreeNode("blue"));
	parent.add(new DefaultMutableTreeNode("violet"));
	parent.add(new DefaultMutableTreeNode("red"));
	parent.add(new DefaultMutableTreeNode("yellow"));

	parent = new DefaultMutableTreeNode("sports");
	root.add(parent);
	parent.add(new DefaultMutableTreeNode("basketball"));
	parent.add(new DefaultMutableTreeNode("soccer"));
	parent.add(new DefaultMutableTreeNode("football"));
	parent.add(new DefaultMutableTreeNode("hockey"));

	parent = new DefaultMutableTreeNode("food");
	root.add(parent);
	parent.add(new DefaultMutableTreeNode("hot dogs"));
	parent.add(new DefaultMutableTreeNode("pizza"));
	parent.add(new DefaultMutableTreeNode("ravioli"));
	parent.add(new DefaultMutableTreeNode("bananas"));
	return new DefaultTreeModel(root);
	}

	/**
	* Returns a <code>TreeModel</code> wrapping the specified object.
	* If the object is:<ul>
	* <li>an array of <code>Object</code>s,
	* <li>a <code>Hashtable</code>, or
	* <li>a <code>Vector</code>
	* </ul>then a new root node is created with each of the incoming
	* objects as children. Otherwise, a new root is created with
	* a value of {@code "root"}.
	*
	* @param value the <code>Object</code> used as the foundation for
	* the <code>TreeModel</code>
	* @return a <code>TreeModel</code> wrapping the specified object
	*/
	protected static TreeModel createTreeModel(Object value) {
	DefaultMutableTreeNode root;

	if((value instanceof Object[]) \|\| (value instanceof Hashtable) \|\|
	(value instanceof Vector)) {
	root = new DefaultMutableTreeNode("root");
	DynamicUtilTreeNode.createChildren(root, value);
	}
	else {
	root = new DynamicUtilTreeNode("root", value);
	}
	return new DefaultTreeModel(root, false);
	}

	/**
	* Returns a <code>JTree</code> with a sample model.
	* The default model used by the tree defines a leaf node as any node
	* without children.
	*
	* @see DefaultTreeModel#asksAllowsChildren
	*/
	public JTree() {
	this(getDefaultTreeModel());
	}

	/**
	* Returns a <code>JTree</code> with each element of the
	* specified array as the
	* child of a new root node which is not displayed.
	* By default, the tree defines a leaf node as any node without
	* children.
	*
	* @param value an array of <code>Object</code>s
	* @see DefaultTreeModel#asksAllowsChildren
	*/
	public JTree(Object[] value) {
	this(createTreeModel(value));
	this.setRootVisible(false);
	this.setShowsRootHandles(true);
	expandRoot();
	}

	/**
	* Returns a <code>JTree</code> with each element of the specified
	* <code>Vector</code> as the
	* child of a new root node which is not displayed. By default, the
	* tree defines a leaf node as any node without children.
	*
	* @param value a <code>Vector</code>
	* @see DefaultTreeModel#asksAllowsChildren
	*/
	public JTree(Vector<?> value) {
	this(createTreeModel(value));
	this.setRootVisible(false);
	this.setShowsRootHandles(true);
	expandRoot();
	}

	/**
	* Returns a <code>JTree</code> created from a <code>Hashtable</code>
	* which does not display with root.
	* Each value-half of the key/value pairs in the <code>HashTable</code>
	* becomes a child of the new root node. By default, the tree defines
	* a leaf node as any node without children.
	*
	* @param value a <code>Hashtable</code>
	* @see DefaultTreeModel#asksAllowsChildren
	*/
	public JTree(Hashtable<?,?> value) {
	this(createTreeModel(value));
	this.setRootVisible(false);
	this.setShowsRootHandles(true);
	expandRoot();
	}

	/**
	* Returns a <code>JTree</code> with the specified
	* <code>TreeNode</code> as its root,
	* which displays the root node.
	* By default, the tree defines a leaf node as any node without children.
	*
	* @param root a <code>TreeNode</code> object
	* @see DefaultTreeModel#asksAllowsChildren
	*/
	public JTree(TreeNode root) {
	this(root, false);
	}

	/**
	* Returns a <code>JTree</code> with the specified <code>TreeNode</code>
	* as its root, which
	* displays the root node and which decides whether a node is a
	* leaf node in the specified manner.
	*
	* @param root a <code>TreeNode</code> object
	* @param asksAllowsChildren if false, any node without children is a
	* leaf node; if true, only nodes that do not allow
	* children are leaf nodes
	* @see DefaultTreeModel#asksAllowsChildren
	*/
	public JTree(TreeNode root, boolean asksAllowsChildren) {
	this(new DefaultTreeModel(root, asksAllowsChildren));
	}

	/**
	* Returns an instance of <code>JTree</code> which displays the root node
	* -- the tree is created using the specified data model.
	*
	* @param newModel the <code>TreeModel</code> to use as the data model
	*/
	@ConstructorProperties({"model"})
	public JTree(TreeModel newModel) {
	super();
	expandedStack = new Stack<Stack<TreePath>>();
	toggleClickCount = 2;
	expandedState = new Hashtable<TreePath, Boolean>();
	setLayout(null);
	rowHeight = 16;
	visibleRowCount = 20;
	rootVisible = true;
	selectionModel = new DefaultTreeSelectionModel();
	cellRenderer = null;
	scrollsOnExpand = true;
	setOpaque(true);
	expandsSelectedPaths = true;
	updateUI();
	setModel(newModel);
	}

	/**
	* Returns the L&F object that renders this component.
	*
	* @return the <code>TreeUI</code> object that renders this component
	*/
	public TreeUI getUI() {
	return (TreeUI)ui;
	}

	/**
	* Sets the L&F object that renders this component.
	* <p>
	* This is a bound property.
	*
	* @param ui the <code>TreeUI</code> L&F object
	* @see UIDefaults#getUI
	* @beaninfo
	* bound: true
	* hidden: true
	* attribute: visualUpdate true
	* description: The UI object that implements the Component's LookAndFeel.
	*/
	public void setUI(TreeUI ui) {
	if (this.ui != ui) {
	settingUI = true;
	uiTreeExpansionListener = null;
	try {
	super.setUI(ui);
	}
	finally {
	settingUI = false;
	}
	}
	}

	/**
	* Notification from the <code>UIManager</code> that the L&F has changed.
	* Replaces the current UI object with the latest version from the
	* <code>UIManager</code>.
	*
	* @see JComponent#updateUI
	*/
	public void updateUI() {
	setUI((TreeUI)UIManager.getUI(this));

	SwingUtilities.updateRendererOrEditorUI(getCellRenderer());
	SwingUtilities.updateRendererOrEditorUI(getCellEditor());
	}


	/**
	* Returns the name of the L&F class that renders this component.
	*
	* @return the string "TreeUI"
	* @see JComponent#getUIClassID
	* @see UIDefaults#getUI
	*/
	public String getUIClassID() {
	return uiClassID;
	}


	/**
	* Returns the current <code>TreeCellRenderer</code>
	* that is rendering each cell.
	*
	* @return the <code>TreeCellRenderer</code> that is rendering each cell
	*/
	public TreeCellRenderer getCellRenderer() {
	return cellRenderer;
	}

	/**
	* Sets the <code>TreeCellRenderer</code> that will be used to
	* draw each cell.
	* <p>
	* This is a bound property.
	*
	* @param x the <code>TreeCellRenderer</code> that is to render each cell
	* @beaninfo
	* bound: true
	* description: The TreeCellRenderer that will be used to draw
	* each cell.
	*/
	public void setCellRenderer(TreeCellRenderer x) {
	TreeCellRenderer oldValue = cellRenderer;

	cellRenderer = x;
	firePropertyChange(CELL_RENDERER_PROPERTY, oldValue, cellRenderer);
	invalidate();
	}

	/**
	* Determines whether the tree is editable. Fires a property
	* change event if the new setting is different from the existing
	* setting.
	* <p>
	* This is a bound property.
	*
	* @param flag a boolean value, true if the tree is editable
	* @beaninfo
	* bound: true
	* description: Whether the tree is editable.
	*/
	public void setEditable(boolean flag) {
	boolean oldValue = this.editable;

	this.editable = flag;
	firePropertyChange(EDITABLE_PROPERTY, oldValue, flag);
	if (accessibleContext != null) {
	accessibleContext.firePropertyChange(
	AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
	(oldValue ? AccessibleState.EDITABLE : null),
	(flag ? AccessibleState.EDITABLE : null));
	}
	}

	/**
	* Returns true if the tree is editable.
	*
	* @return true if the tree is editable
	*/
	public boolean isEditable() {
	return editable;
	}

	/**
	* Sets the cell editor. A <code>null</code> value implies that the
	* tree cannot be edited. If this represents a change in the
	* <code>cellEditor</code>, the <code>propertyChange</code>
	* method is invoked on all listeners.
	* <p>
	* This is a bound property.
	*
	* @param cellEditor the <code>TreeCellEditor</code> to use
	* @beaninfo
	* bound: true
	* description: The cell editor. A null value implies the tree
	* cannot be edited.
	*/
	public void setCellEditor(TreeCellEditor cellEditor) {
	TreeCellEditor oldEditor = this.cellEditor;

	this.cellEditor = cellEditor;
	firePropertyChange(CELL_EDITOR_PROPERTY, oldEditor, cellEditor);
	invalidate();
	}

	/**
	* Returns the editor used to edit entries in the tree.
	*
	* @return the <code>TreeCellEditor</code> in use,
	* or <code>null</code> if the tree cannot be edited
	*/
	public TreeCellEditor getCellEditor() {
	return cellEditor;
	}

	/**
	* Returns the <code>TreeModel</code> that is providing the data.
	*
	* @return the <code>TreeModel</code> that is providing the data
	*/
	public TreeModel getModel() {
	return treeModel;
	}

	/**
	* Sets the <code>TreeModel</code> that will provide the data.
	* <p>
	* This is a bound property.
	*
	* @param newModel the <code>TreeModel</code> that is to provide the data
	* @beaninfo
	* bound: true
	* description: The TreeModel that will provide the data.
	*/
	public void setModel(TreeModel newModel) {
	clearSelection();

	TreeModel oldModel = treeModel;

	if(treeModel != null && treeModelListener != null)
	treeModel.removeTreeModelListener(treeModelListener);

	if (accessibleContext != null) {
	if (treeModel != null) {
	treeModel.removeTreeModelListener((TreeModelListener)accessibleContext);
	}
	if (newModel != null) {
	newModel.addTreeModelListener((TreeModelListener)accessibleContext);
	}
	}

	treeModel = newModel;
	clearToggledPaths();
	if(treeModel != null) {
	if(treeModelListener == null)
	treeModelListener = createTreeModelListener();
	if(treeModelListener != null)
	treeModel.addTreeModelListener(treeModelListener);
	// Mark the root as expanded, if it isn't a leaf.
	Object treeRoot = treeModel.getRoot();
	if(treeRoot != null &&
	!treeModel.isLeaf(treeRoot)) {
	expandedState.put(new TreePath(treeRoot),
	Boolean.TRUE);
	}
	}
	firePropertyChange(TREE_MODEL_PROPERTY, oldModel, treeModel);
	invalidate();
	}

	/**
	* Returns true if the root node of the tree is displayed.
	*
	* @return true if the root node of the tree is displayed
	* @see #rootVisible
	*/
	public boolean isRootVisible() {
	return rootVisible;
	}

	/**
	* Determines whether or not the root node from
	* the <code>TreeModel</code> is visible.
	* <p>
	* This is a bound property.
	*
	* @param rootVisible true if the root node of the tree is to be displayed
	* @see #rootVisible
	* @beaninfo
	* bound: true
	* description: Whether or not the root node
	* from the TreeModel is visible.
	*/
	public void setRootVisible(boolean rootVisible) {
	boolean oldValue = this.rootVisible;

	this.rootVisible = rootVisible;
	firePropertyChange(ROOT_VISIBLE_PROPERTY, oldValue, this.rootVisible);
	if (accessibleContext != null) {
	((AccessibleJTree)accessibleContext).fireVisibleDataPropertyChange();
	}
	}

	/**
	* Sets the value of the <code>showsRootHandles</code> property,
	* which specifies whether the node handles should be displayed.
	* The default value of this property depends on the constructor
	* used to create the <code>JTree</code>.
	* Some look and feels might not support handles;
	* they will ignore this property.
	* <p>
	* This is a bound property.
	*
	* @param newValue <code>true</code> if root handles should be displayed;
	* otherwise, <code>false</code>
	* @see #showsRootHandles
	* @see #getShowsRootHandles
	* @beaninfo
	* bound: true
	* description: Whether the node handles are to be
	* displayed.
	*/
	public void setShowsRootHandles(boolean newValue) {
	boolean oldValue = showsRootHandles;
	TreeModel model = getModel();

	showsRootHandles = newValue;
	showsRootHandlesSet = true;
	firePropertyChange(SHOWS_ROOT_HANDLES_PROPERTY, oldValue,
	showsRootHandles);
	if (accessibleContext != null) {
	((AccessibleJTree)accessibleContext).fireVisibleDataPropertyChange();
	}
	invalidate();
	}

	/**
	* Returns the value of the <code>showsRootHandles</code> property.
	*
	* @return the value of the <code>showsRootHandles</code> property
	* @see #showsRootHandles
	*/
	public boolean getShowsRootHandles()
	{
	return showsRootHandles;
	}

	/**
	* Sets the height of each cell, in pixels. If the specified value
	* is less than or equal to zero the current cell renderer is
	* queried for each row's height.
	* <p>
	* This is a bound property.
	*
	* @param rowHeight the height of each cell, in pixels
	* @beaninfo
	* bound: true
	* description: The height of each cell.
	*/
	public void setRowHeight(int rowHeight)
	{
	int oldValue = this.rowHeight;

	this.rowHeight = rowHeight;
	rowHeightSet = true;
	firePropertyChange(ROW_HEIGHT_PROPERTY, oldValue, this.rowHeight);
	invalidate();
	}

	/**
	* Returns the height of each row. If the returned value is less than
	* or equal to 0 the height for each row is determined by the
	* renderer.
	*
	*/
	public int getRowHeight()
	{
	return rowHeight;
	}

	/**
	* Returns true if the height of each display row is a fixed size.
	*
	* @return true if the height of each row is a fixed size
	*/
	public boolean isFixedRowHeight()
	{
	return (rowHeight > 0);
	}

	/**
	* Specifies whether the UI should use a large model.
	* (Not all UIs will implement this.) Fires a property change
	* for the LARGE_MODEL_PROPERTY.
	* <p>
	* This is a bound property.
	*
	* @param newValue true to suggest a large model to the UI
	* @see #largeModel
	* @beaninfo
	* bound: true
	* description: Whether the UI should use a
	* large model.
	*/
	public void setLargeModel(boolean newValue) {
	boolean oldValue = largeModel;

	largeModel = newValue;
	firePropertyChange(LARGE_MODEL_PROPERTY, oldValue, newValue);
	}

	/**
	* Returns true if the tree is configured for a large model.
	*
	* @return true if a large model is suggested
	* @see #largeModel
	*/
	public boolean isLargeModel() {
	return largeModel;
	}

	/**
	* Determines what happens when editing is interrupted by selecting
	* another node in the tree, a change in the tree's data, or by some
	* other means. Setting this property to <code>true</code> causes the
	* changes to be automatically saved when editing is interrupted.
	* <p>
	* Fires a property change for the INVOKES_STOP_CELL_EDITING_PROPERTY.
	*
	* @param newValue true means that <code>stopCellEditing</code> is invoked
	* when editing is interrupted, and data is saved; false means that
	* <code>cancelCellEditing</code> is invoked, and changes are lost
	* @beaninfo
	* bound: true
	* description: Determines what happens when editing is interrupted,
	* selecting another node in the tree, a change in the
	* tree's data, or some other means.
	*/
	public void setInvokesStopCellEditing(boolean newValue) {
	boolean oldValue = invokesStopCellEditing;

	invokesStopCellEditing = newValue;
	firePropertyChange(INVOKES_STOP_CELL_EDITING_PROPERTY, oldValue,
	newValue);
	}

	/**
	* Returns the indicator that tells what happens when editing is
	* interrupted.
	*
	* @return the indicator that tells what happens when editing is
	* interrupted
	* @see #setInvokesStopCellEditing
	*/
	public boolean getInvokesStopCellEditing() {
	return invokesStopCellEditing;
	}

	/**
	* Sets the <code>scrollsOnExpand</code> property,
	* which determines whether the
	* tree might scroll to show previously hidden children.
	* If this property is <code>true</code> (the default),
	* when a node expands
	* the tree can use scrolling to make
	* the maximum possible number of the node's descendants visible.
	* In some look and feels, trees might not need to scroll when expanded;
	* those look and feels will ignore this property.
	* <p>
	* This is a bound property.
	*
	* @param newValue <code>false</code> to disable scrolling on expansion;
	* <code>true</code> to enable it
	* @see #getScrollsOnExpand
	*
	* @beaninfo
	* bound: true
	* description: Indicates if a node descendant should be scrolled when expanded.
	*/
	public void setScrollsOnExpand(boolean newValue) {
	boolean oldValue = scrollsOnExpand;

	scrollsOnExpand = newValue;
	scrollsOnExpandSet = true;
	firePropertyChange(SCROLLS_ON_EXPAND_PROPERTY, oldValue,
	newValue);
	}

	/**
	* Returns the value of the <code>scrollsOnExpand</code> property.
	*
	* @return the value of the <code>scrollsOnExpand</code> property
	*/
	public boolean getScrollsOnExpand() {
	return scrollsOnExpand;
	}

	/**
	* Sets the number of mouse clicks before a node will expand or close.
	* The default is two.
	* <p>
	* This is a bound property.
	*
	* @since 1.3
	* @beaninfo
	* bound: true
	* description: Number of clicks before a node will expand/collapse.
	*/
	public void setToggleClickCount(int clickCount) {
	int oldCount = toggleClickCount;

	toggleClickCount = clickCount;
	firePropertyChange(TOGGLE_CLICK_COUNT_PROPERTY, oldCount,
	clickCount);
	}

	/**
	* Returns the number of mouse clicks needed to expand or close a node.
	*
	* @return number of mouse clicks before node is expanded
	* @since 1.3
	*/
	public int getToggleClickCount() {
	return toggleClickCount;
	}

	/**
	* Configures the <code>expandsSelectedPaths</code> property. If
	* true, any time the selection is changed, either via the
	* <code>TreeSelectionModel</code>, or the cover methods provided by
	* <code>JTree</code>, the <code>TreePath</code>s parents will be
	* expanded to make them visible (visible meaning the parent path is
	* expanded, not necessarily in the visible rectangle of the
	* <code>JTree</code>). If false, when the selection
	* changes the nodes parent is not made visible (all its parents expanded).
	* This is useful if you wish to have your selection model maintain paths
	* that are not always visible (all parents expanded).
	* <p>
	* This is a bound property.
	*
	* @param newValue the new value for <code>expandsSelectedPaths</code>
	*
	* @since 1.3
	* @beaninfo
	* bound: true
	* description: Indicates whether changes to the selection should make
	* the parent of the path visible.
	*/
	public void setExpandsSelectedPaths(boolean newValue) {
	boolean oldValue = expandsSelectedPaths;

	expandsSelectedPaths = newValue;
	firePropertyChange(EXPANDS_SELECTED_PATHS_PROPERTY, oldValue,
	newValue);
	}

	/**
	* Returns the <code>expandsSelectedPaths</code> property.
	* @return true if selection changes result in the parent path being
	* expanded
	* @since 1.3
	* @see #setExpandsSelectedPaths
	*/
	public boolean getExpandsSelectedPaths() {
	return expandsSelectedPaths;
	}

	/**
	* Turns on or off automatic drag handling. In order to enable automatic
	* drag handling, this property should be set to {@code true}, and the
	* tree's {@code TransferHandler} needs to be {@code non-null}.
	* The default value of the {@code dragEnabled} property is {@code false}.
	* <p>
	* The job of honoring this property, and recognizing a user drag gesture,
	* lies with the look and feel implementation, and in particular, the tree's
	* {@code TreeUI}. When automatic drag handling is enabled, most look and
	* feels (including those that subclass {@code BasicLookAndFeel}) begin a
	* drag and drop operation whenever the user presses the mouse button over
	* an item and then moves the mouse a few pixels. Setting this property to
	* {@code true} can therefore have a subtle effect on how selections behave.
	* <p>
	* If a look and feel is used that ignores this property, you can still
	* begin a drag and drop operation by calling {@code exportAsDrag} on the
	* tree's {@code TransferHandler}.
	*
	* @param b whether or not to enable automatic drag handling
	* @exception HeadlessException if
	* <code>b</code> is <code>true</code> and
	* <code>GraphicsEnvironment.isHeadless()</code>
	* returns <code>true</code>
	* @see java.awt.GraphicsEnvironment#isHeadless
	* @see #getDragEnabled
	* @see #setTransferHandler
	* @see TransferHandler
	* @since 1.4
	*
	* @beaninfo
	* description: determines whether automatic drag handling is enabled
	* bound: false
	*/
	public void setDragEnabled(boolean b) {
	if (b && GraphicsEnvironment.isHeadless()) {
	throw new HeadlessException();
	}
	dragEnabled = b;
	}

	/**
	* Returns whether or not automatic drag handling is enabled.
	*
	* @return the value of the {@code dragEnabled} property
	* @see #setDragEnabled
	* @since 1.4
	*/
	public boolean getDragEnabled() {
	return dragEnabled;
	}

	/**
	* Sets the drop mode for this component. For backward compatibility,
	* the default for this property is <code>DropMode.USE_SELECTION</code>.
	* Usage of one of the other modes is recommended, however, for an
	* improved user experience. <code>DropMode.ON</code>, for instance,
	* offers similar behavior of showing items as selected, but does so without
	* affecting the actual selection in the tree.
	* <p>
	* <code>JTree</code> supports the following drop modes:
	* <ul>
	* <li><code>DropMode.USE_SELECTION</code></li>
	* <li><code>DropMode.ON</code></li>
	* <li><code>DropMode.INSERT</code></li>
	* <li><code>DropMode.ON_OR_INSERT</code></li>
	* </ul>
	* <p>
	* The drop mode is only meaningful if this component has a
	* <code>TransferHandler</code> that accepts drops.
	*
	* @param dropMode the drop mode to use
	* @throws IllegalArgumentException if the drop mode is unsupported
	* or <code>null</code>
	* @see #getDropMode
	* @see #getDropLocation
	* @see #setTransferHandler
	* @see TransferHandler
	* @since 1.6
	*/
	public final void setDropMode(DropMode dropMode) {
	if (dropMode != null) {
	switch (dropMode) {
	case USE_SELECTION:
	case ON:
	case INSERT:
	case ON_OR_INSERT:
	this.dropMode = dropMode;
	return;
	}
	}

	throw new IllegalArgumentException(dropMode + ": Unsupported drop mode for tree");
	}

	/**
	* Returns the drop mode for this component.
	*
	* @return the drop mode for this component
	* @see #setDropMode
	* @since 1.6
	*/
	public final DropMode getDropMode() {
	return dropMode;
	}

	/**
	* Calculates a drop location in this component, representing where a
	* drop at the given point should insert data.
	*
	* @param p the point to calculate a drop location for
	* @return the drop location, or <code>null</code>
	*/
	DropLocation dropLocationForPoint(Point p) {
	DropLocation location = null;

	int row = getClosestRowForLocation(p.x, p.y);
	Rectangle bounds = getRowBounds(row);
	TreeModel model = getModel();
	Object root = (model == null) ? null : model.getRoot();
	TreePath rootPath = (root == null) ? null : new TreePath(root);

	TreePath child;
	TreePath parent;
	boolean outside = row == -1
	\|\| p.y < bounds.y
	\|\| p.y >= bounds.y + bounds.height;

	switch(dropMode) {
	case USE_SELECTION:
	case ON:
	if (outside) {
	location = new DropLocation(p, null, -1);
	} else {
	location = new DropLocation(p, getPathForRow(row), -1);
	}

	break;
	case INSERT:
	case ON_OR_INSERT:
	if (row == -1) {
	if (root != null && !model.isLeaf(root) && isExpanded(rootPath)) {
	location = new DropLocation(p, rootPath, 0);
	} else {
	location = new DropLocation(p, null, -1);
	}

	break;
	}

	boolean checkOn = dropMode == DropMode.ON_OR_INSERT
	\|\| !model.isLeaf(getPathForRow(row).getLastPathComponent());

	Section section = SwingUtilities2.liesInVertical(bounds, p, checkOn);
	if(section == LEADING) {
	child = getPathForRow(row);
	parent = child.getParentPath();
	} else if (section == TRAILING) {
	int index = row + 1;
	if (index >= getRowCount()) {
	if (model.isLeaf(root) \|\| !isExpanded(rootPath)) {
	location = new DropLocation(p, null, -1);
	} else {
	parent = rootPath;
	index = model.getChildCount(root);
	location = new DropLocation(p, parent, index);
	}

	break;
	}

	child = getPathForRow(index);
	parent = child.getParentPath();
	} else {
	assert checkOn;
	location = new DropLocation(p, getPathForRow(row), -1);
	break;
	}

	if (parent != null) {
	location = new DropLocation(p, parent,
	model.getIndexOfChild(parent.getLastPathComponent(),
	child.getLastPathComponent()));
	} else if (checkOn \|\| !model.isLeaf(root)) {
	location = new DropLocation(p, rootPath, -1);
	} else {
	location = new DropLocation(p, null, -1);
	}

	break;
	default:
	assert false : "Unexpected drop mode";
	}

	if (outside \|\| row != expandRow) {
	cancelDropTimer();
	}

	if (!outside && row != expandRow) {
	if (isCollapsed(row)) {
	expandRow = row;
	startDropTimer();
	}
	}

	return location;
	}

	/**
	* Called to set or clear the drop location during a DnD operation.
	* In some cases, the component may need to use it's internal selection
	* temporarily to indicate the drop location. To help facilitate this,
	* this method returns and accepts as a parameter a state object.
	* This state object can be used to store, and later restore, the selection
	* state. Whatever this method returns will be passed back to it in
	* future calls, as the state parameter. If it wants the DnD system to
	* continue storing the same state, it must pass it back every time.
	* Here's how this is used:
	* <p>
	* Let's say that on the first call to this method the component decides
	* to save some state (because it is about to use the selection to show
	* a drop index). It can return a state object to the caller encapsulating
	* any saved selection state. On a second call, let's say the drop location
	* is being changed to something else. The component doesn't need to
	* restore anything yet, so it simply passes back the same state object
	* to have the DnD system continue storing it. Finally, let's say this
	* method is messaged with <code>null</code>. This means DnD
	* is finished with this component for now, meaning it should restore
	* state. At this point, it can use the state parameter to restore
	* said state, and of course return <code>null</code> since there's
	* no longer anything to store.
	*
	* @param location the drop location (as calculated by
	* <code>dropLocationForPoint</code>) or <code>null</code>
	* if there's no longer a valid drop location
	* @param state the state object saved earlier for this component,
	* or <code>null</code>
	* @param forDrop whether or not the method is being called because an
	* actual drop occurred
	* @return any saved state for this component, or <code>null</code> if none
	*/
	Object setDropLocation(TransferHandler.DropLocation location,
	Object state,
	boolean forDrop) {

	Object retVal = null;
	DropLocation treeLocation = (DropLocation)location;

	if (dropMode == DropMode.USE_SELECTION) {
	if (treeLocation == null) {
	if (!forDrop && state != null) {
	setSelectionPaths(((TreePath[][])state)[0]);
	setAnchorSelectionPath(((TreePath[][])state)[1][0]);
	setLeadSelectionPath(((TreePath[][])state)[1][1]);
	}
	} else {
	if (dropLocation == null) {
	TreePath[] paths = getSelectionPaths();
	if (paths == null) {
	paths = new TreePath[0];
	}

	retVal = new TreePath[][] {paths,
	{getAnchorSelectionPath(), getLeadSelectionPath()}};
	} else {
	retVal = state;
	}

	setSelectionPath(treeLocation.getPath());
	}
	}

	DropLocation old = dropLocation;
	dropLocation = treeLocation;
	firePropertyChange("dropLocation", old, dropLocation);

	return retVal;
	}

	/**
	* Called to indicate to this component that DnD is done.
	* Allows for us to cancel the expand timer.
	*/
	void dndDone() {
	cancelDropTimer();
	dropTimer = null;
	}

	/**
	* Returns the location that this component should visually indicate
	* as the drop location during a DnD operation over the component,
	* or {@code null} if no location is to currently be shown.
	* <p>
	* This method is not meant for querying the drop location
	* from a {@code TransferHandler}, as the drop location is only
	* set after the {@code TransferHandler}'s <code>canImport</code>
	* has returned and has allowed for the location to be shown.
	* <p>
	* When this property changes, a property change event with
	* name "dropLocation" is fired by the component.
	*
	* @return the drop location
	* @see #setDropMode
	* @see TransferHandler#canImport(TransferHandler.TransferSupport)
	* @since 1.6
	*/
	public final DropLocation getDropLocation() {
	return dropLocation;
	}

	private void startDropTimer() {
	if (dropTimer == null) {
	dropTimer = new TreeTimer();
	}
	dropTimer.start();
	}

	private void cancelDropTimer() {
	if (dropTimer != null && dropTimer.isRunning()) {
	expandRow = -1;
	dropTimer.stop();
	}
	}

	/**
	* Returns <code>isEditable</code>. This is invoked from the UI before
	* editing begins to insure that the given path can be edited. This
	* is provided as an entry point for subclassers to add filtered
	* editing without having to resort to creating a new editor.
	*
	* @return true if every parent node and the node itself is editable
	* @see #isEditable
	*/
	public boolean isPathEditable(TreePath path) {
	return isEditable();
	}

	/**
	* Overrides <code>JComponent</code>'s <code>getToolTipText</code>
	* method in order to allow
	* renderer's tips to be used if it has text set.
	* <p>
	* NOTE: For <code>JTree</code> to properly display tooltips of its
	* renderers, <code>JTree</code> must be a registered component with the
	* <code>ToolTipManager</code>. This can be done by invoking
	* <code>ToolTipManager.sharedInstance().registerComponent(tree)</code>.
	* This is not done automatically!
	*
	* @param event the <code>MouseEvent</code> that initiated the
	* <code>ToolTip</code> display
	* @return a string containing the tooltip or <code>null</code>
	* if <code>event</code> is null
	*/
	public String getToolTipText(MouseEvent event) {
	String tip = null;

	if(event != null) {
	Point p = event.getPoint();
	int selRow = getRowForLocation(p.x, p.y);
	TreeCellRenderer r = getCellRenderer();

	if(selRow != -1 && r != null) {
	TreePath path = getPathForRow(selRow);
	Object lastPath = path.getLastPathComponent();
	Component rComponent = r.getTreeCellRendererComponent
	(this, lastPath, isRowSelected(selRow),
	isExpanded(selRow), getModel().isLeaf(lastPath), selRow,
	true);

	if(rComponent instanceof JComponent) {
	MouseEvent newEvent;
	Rectangle pathBounds = getPathBounds(path);

	p.translate(-pathBounds.x, -pathBounds.y);
	newEvent = new MouseEvent(rComponent, event.getID(),
	event.getWhen(),
	event.getModifiers(),
	p.x, p.y,
	event.getXOnScreen(),
	event.getYOnScreen(),
	event.getClickCount(),
	event.isPopupTrigger(),
	MouseEvent.NOBUTTON);
	MouseEventAccessor meAccessor =
	AWTAccessor.getMouseEventAccessor();
	meAccessor.setCausedByTouchEvent(newEvent,
	meAccessor.isCausedByTouchEvent(event));

	tip = ((JComponent)rComponent).getToolTipText(newEvent);
	}
	}
	}
	// No tip from the renderer get our own tip
	if (tip == null) {
	tip = getToolTipText();
	}
	return tip;
	}

	/**
	* Called by the renderers to convert the specified value to
	* text. This implementation returns <code>value.toString</code>, ignoring
	* all other arguments. To control the conversion, subclass this
	* method and use any of the arguments you need.
	*
	* @param value the <code>Object</code> to convert to text
	* @param selected true if the node is selected
	* @param expanded true if the node is expanded
	* @param leaf true if the node is a leaf node
	* @param row an integer specifying the node's display row, where 0 is
	* the first row in the display
	* @param hasFocus true if the node has the focus
	* @return the <code>String</code> representation of the node's value
	*/
	public String convertValueToText(Object value, boolean selected,
	boolean expanded, boolean leaf, int row,
	boolean hasFocus) {
	if(value != null) {
	String sValue = value.toString();
	if (sValue != null) {
	return sValue;
	}
	}
	return "";
	}

	//
	// The following are convenience methods that get forwarded to the
	// current TreeUI.
	//

	/**
	* Returns the number of viewable nodes. A node is viewable if all of its
	* parents are expanded. The root is only included in this count if
	* {@code isRootVisible()} is {@code true}. This returns {@code 0} if
	* the UI has not been set.
	*
	* @return the number of viewable nodes
	*/
	public int getRowCount() {
	TreeUI tree = getUI();

	if(tree != null)
	return tree.getRowCount(this);
	return 0;
	}

	/**
	* Selects the node identified by the specified path. If any
	* component of the path is hidden (under a collapsed node), and
	* <code>getExpandsSelectedPaths</code> is true it is
	* exposed (made viewable).
	*
	* @param path the <code>TreePath</code> specifying the node to select
	*/
	public void setSelectionPath(TreePath path) {
	getSelectionModel().setSelectionPath(path);
	}

	/**
	* Selects the nodes identified by the specified array of paths.
	* If any component in any of the paths is hidden (under a collapsed
	* node), and <code>getExpandsSelectedPaths</code> is true
	* it is exposed (made viewable).
	*
	* @param paths an array of <code>TreePath</code> objects that specifies
	* the nodes to select
	*/
	public void setSelectionPaths(TreePath[] paths) {
	getSelectionModel().setSelectionPaths(paths);
	}

	/**
	* Sets the path identifies as the lead. The lead may not be selected.
	* The lead is not maintained by <code>JTree</code>,
	* rather the UI will update it.
	* <p>
	* This is a bound property.
	*
	* @param newPath the new lead path
	* @since 1.3
	* @beaninfo
	* bound: true
	* description: Lead selection path
	*/
	public void setLeadSelectionPath(TreePath newPath) {
	TreePath oldValue = leadPath;

	leadPath = newPath;
	firePropertyChange(LEAD_SELECTION_PATH_PROPERTY, oldValue, newPath);

	if (accessibleContext != null){
	((AccessibleJTree)accessibleContext).
	fireActiveDescendantPropertyChange(oldValue, newPath);
	}
	}

	/**
	* Sets the path identified as the anchor.
	* The anchor is not maintained by <code>JTree</code>, rather the UI will
	* update it.
	* <p>
	* This is a bound property.
	*
	* @param newPath the new anchor path
	* @since 1.3
	* @beaninfo
	* bound: true
	* description: Anchor selection path
	*/
	public void setAnchorSelectionPath(TreePath newPath) {
	TreePath oldValue = anchorPath;

	anchorPath = newPath;
	firePropertyChange(ANCHOR_SELECTION_PATH_PROPERTY, oldValue, newPath);
	}

	/**
	* Selects the node at the specified row in the display.
	*
	* @param row the row to select, where 0 is the first row in
	* the display
	*/
	public void setSelectionRow(int row) {
	int[] rows = { row };

	setSelectionRows(rows);
	}

	/**
	* Selects the nodes corresponding to each of the specified rows
	* in the display. If a particular element of <code>rows</code> is
	* < 0 or >= <code>getRowCount</code>, it will be ignored.
	* If none of the elements
	* in <code>rows</code> are valid rows, the selection will
	* be cleared. That is it will be as if <code>clearSelection</code>
	* was invoked.
	*
	* @param rows an array of ints specifying the rows to select,
	* where 0 indicates the first row in the display
	*/
	public void setSelectionRows(int[] rows) {
	TreeUI ui = getUI();

	if(ui != null && rows != null) {
	int numRows = rows.length;
	TreePath[] paths = new TreePath[numRows];

	for(int counter = 0; counter < numRows; counter++) {
	paths[counter] = ui.getPathForRow(this, rows[counter]);
	}
	setSelectionPaths(paths);
	}
	}

	/**
	* Adds the node identified by the specified <code>TreePath</code>
	* to the current selection. If any component of the path isn't
	* viewable, and <code>getExpandsSelectedPaths</code> is true it is
	* made viewable.
	* <p>
	* Note that <code>JTree</code> does not allow duplicate nodes to
	* exist as children under the same parent -- each sibling must be
	* a unique object.
	*
	* @param path the <code>TreePath</code> to add
	*/
	public void addSelectionPath(TreePath path) {
	getSelectionModel().addSelectionPath(path);
	}

	/**
	* Adds each path in the array of paths to the current selection. If
	* any component of any of the paths isn't viewable and
	* <code>getExpandsSelectedPaths</code> is true, it is
	* made viewable.
	* <p>
	* Note that <code>JTree</code> does not allow duplicate nodes to
	* exist as children under the same parent -- each sibling must be
	* a unique object.
	*
	* @param paths an array of <code>TreePath</code> objects that specifies
	* the nodes to add
	*/
	public void addSelectionPaths(TreePath[] paths) {
	getSelectionModel().addSelectionPaths(paths);
	}

	/**
	* Adds the path at the specified row to the current selection.
	*
	* @param row an integer specifying the row of the node to add,
	* where 0 is the first row in the display
	*/
	public void addSelectionRow(int row) {
	int[] rows = { row };

	addSelectionRows(rows);
	}

	/**
	* Adds the paths at each of the specified rows to the current selection.
	*
	* @param rows an array of ints specifying the rows to add,
	* where 0 indicates the first row in the display
	*/
	public void addSelectionRows(int[] rows) {
	TreeUI ui = getUI();

	if(ui != null && rows != null) {
	int numRows = rows.length;
	TreePath[] paths = new TreePath[numRows];

	for(int counter = 0; counter < numRows; counter++)
	paths[counter] = ui.getPathForRow(this, rows[counter]);
	addSelectionPaths(paths);
	}
	}

	/**
	* Returns the last path component of the selected path. This is
	* a convenience method for
	* {@code getSelectionModel().getSelectionPath().getLastPathComponent()}.
	* This is typically only useful if the selection has one path.
	*
	* @return the last path component of the selected path, or
	* <code>null</code> if nothing is selected
	* @see TreePath#getLastPathComponent
	*/
	public Object getLastSelectedPathComponent() {
	TreePath selPath = getSelectionModel().getSelectionPath();

	if(selPath != null)
	return selPath.getLastPathComponent();
	return null;
	}

	/**
	* Returns the path identified as the lead.
	* @return path identified as the lead
	*/
	public TreePath getLeadSelectionPath() {
	return leadPath;
	}

	/**
	* Returns the path identified as the anchor.
	* @return path identified as the anchor
	* @since 1.3
	*/
	public TreePath getAnchorSelectionPath() {
	return anchorPath;
	}

	/**
	* Returns the path to the first selected node.
	*
	* @return the <code>TreePath</code> for the first selected node,
	* or <code>null</code> if nothing is currently selected
	*/
	public TreePath getSelectionPath() {
	return getSelectionModel().getSelectionPath();
	}

	/**
	* Returns the paths of all selected values.
	*
	* @return an array of <code>TreePath</code> objects indicating the selected
	* nodes, or <code>null</code> if nothing is currently selected
	*/
	public TreePath[] getSelectionPaths() {
	TreePath[] selectionPaths = getSelectionModel().getSelectionPaths();

	return (selectionPaths != null && selectionPaths.length > 0) ? selectionPaths : null;
	}

	/**
	* Returns all of the currently selected rows. This method is simply
	* forwarded to the <code>TreeSelectionModel</code>.
	* If nothing is selected <code>null</code> or an empty array will
	* be returned, based on the <code>TreeSelectionModel</code>
	* implementation.
	*
	* @return an array of integers that identifies all currently selected rows
	* where 0 is the first row in the display
	*/
	public int[] getSelectionRows() {
	return getSelectionModel().getSelectionRows();
	}

	/**
	* Returns the number of nodes selected.
	*
	* @return the number of nodes selected
	*/
	public int getSelectionCount() {
	return selectionModel.getSelectionCount();
	}

	/**
	* Returns the smallest selected row. If the selection is empty, or
	* none of the selected paths are viewable, {@code -1} is returned.
	*
	* @return the smallest selected row
	*/
	public int getMinSelectionRow() {
	return getSelectionModel().getMinSelectionRow();
	}

	/**
	* Returns the largest selected row. If the selection is empty, or
	* none of the selected paths are viewable, {@code -1} is returned.
	*
	* @return the largest selected row
	*/
	public int getMaxSelectionRow() {
	return getSelectionModel().getMaxSelectionRow();
	}

	/**
	* Returns the row index corresponding to the lead path.
	*
	* @return an integer giving the row index of the lead path,
	* where 0 is the first row in the display; or -1
	* if <code>leadPath</code> is <code>null</code>
	*/
	public int getLeadSelectionRow() {
	TreePath leadPath = getLeadSelectionPath();

	if (leadPath != null) {
	return getRowForPath(leadPath);
	}
	return -1;
	}

	/**
	* Returns true if the item identified by the path is currently selected.
	*
	* @param path a <code>TreePath</code> identifying a node
	* @return true if the node is selected
	*/
	public boolean isPathSelected(TreePath path) {
	return getSelectionModel().isPathSelected(path);
	}

	/**
	* Returns true if the node identified by row is selected.
	*
	* @param row an integer specifying a display row, where 0 is the first
	* row in the display
	* @return true if the node is selected
	*/
	public boolean isRowSelected(int row) {
	return getSelectionModel().isRowSelected(row);
	}

	/**
	* Returns an <code>Enumeration</code> of the descendants of the
	* path <code>parent</code> that
	* are currently expanded. If <code>parent</code> is not currently
	* expanded, this will return <code>null</code>.
	* If you expand/collapse nodes while
	* iterating over the returned <code>Enumeration</code>
	* this may not return all
	* the expanded paths, or may return paths that are no longer expanded.
	*
	* @param parent the path which is to be examined
	* @return an <code>Enumeration</code> of the descendents of
	* <code>parent</code>, or <code>null</code> if
	* <code>parent</code> is not currently expanded
	*/
	public Enumeration<TreePath> getExpandedDescendants(TreePath parent) {
	if(!isExpanded(parent))
	return null;

	Enumeration<TreePath> toggledPaths = expandedState.keys();
	Vector<TreePath> elements = null;
	TreePath path;
	Object value;

	if(toggledPaths != null) {
	while(toggledPaths.hasMoreElements()) {
	path = toggledPaths.nextElement();
	value = expandedState.get(path);
	// Add the path if it is expanded, a descendant of parent,
	// and it is visible (all parents expanded). This is rather
	// expensive!
	if(path != parent && value != null &&
	((Boolean)value).booleanValue() &&
	parent.isDescendant(path) && isVisible(path)) {
	if (elements == null) {
	elements = new Vector<TreePath>();
	}
	elements.addElement(path);
	}
	}
	}
	if (elements == null) {
	Set<TreePath> empty = Collections.emptySet();
	return Collections.enumeration(empty);
	}
	return elements.elements();
	}

	/**
	* Returns true if the node identified by the path has ever been
	* expanded.
	* @return true if the <code>path</code> has ever been expanded
	*/
	public boolean hasBeenExpanded(TreePath path) {
	return (path != null && expandedState.get(path) != null);
	}

	/**
	* Returns true if the node identified by the path is currently expanded,
	*
	* @param path the <code>TreePath</code> specifying the node to check
	* @return false if any of the nodes in the node's path are collapsed,
	* true if all nodes in the path are expanded
	*/
	public boolean isExpanded(TreePath path) {

	if(path == null)
	return false;
	Object value;

	do{
	value = expandedState.get(path);
	if(value == null \|\| !((Boolean)value).booleanValue())
	return false;
	} while( (path=path.getParentPath())!=null );

	return true;
	}

	/**
	* Returns true if the node at the specified display row is currently
	* expanded.
	*
	* @param row the row to check, where 0 is the first row in the
	* display
	* @return true if the node is currently expanded, otherwise false
	*/
	public boolean isExpanded(int row) {
	TreeUI tree = getUI();

	if(tree != null) {
	TreePath path = tree.getPathForRow(this, row);

	if(path != null) {
	Boolean value = expandedState.get(path);

	return (value != null && value.booleanValue());
	}
	}
	return false;
	}

	/**
	* Returns true if the value identified by path is currently collapsed,
	* this will return false if any of the values in path are currently
	* not being displayed.
	*
	* @param path the <code>TreePath</code> to check
	* @return true if any of the nodes in the node's path are collapsed,
	* false if all nodes in the path are expanded
	*/
	public boolean isCollapsed(TreePath path) {
	return !isExpanded(path);
	}

	/**
	* Returns true if the node at the specified display row is collapsed.
	*
	* @param row the row to check, where 0 is the first row in the
	* display
	* @return true if the node is currently collapsed, otherwise false
	*/
	public boolean isCollapsed(int row) {
	return !isExpanded(row);
	}

	/**
	* Ensures that the node identified by path is currently viewable.
	*
	* @param path the <code>TreePath</code> to make visible
	*/
	public void makeVisible(TreePath path) {
	if(path != null) {
	TreePath parentPath = path.getParentPath();

	if(parentPath != null) {
	expandPath(parentPath);
	}
	}
	}

	/**
	* Returns true if the value identified by path is currently viewable,
	* which means it is either the root or all of its parents are expanded.
	* Otherwise, this method returns false.
	*
	* @return true if the node is viewable, otherwise false
	*/
	public boolean isVisible(TreePath path) {
	if(path != null) {
	TreePath parentPath = path.getParentPath();

	if(parentPath != null)
	return isExpanded(parentPath);
	// Root.
	return true;
	}
	return false;
	}

	/**
	* Returns the <code>Rectangle</code> that the specified node will be drawn
	* into. Returns <code>null</code> if any component in the path is hidden
	* (under a collapsed parent).
	* <p>
	* Note:<br>
	* This method returns a valid rectangle, even if the specified
	* node is not currently displayed.
	*
	* @param path the <code>TreePath</code> identifying the node
	* @return the <code>Rectangle</code> the node is drawn in,
	* or <code>null</code>
	*/
	public Rectangle getPathBounds(TreePath path) {
	TreeUI tree = getUI();

	if(tree != null)
	return tree.getPathBounds(this, path);
	return null;
	}

	/**
	* Returns the <code>Rectangle</code> that the node at the specified row is
	* drawn in.
	*
	* @param row the row to be drawn, where 0 is the first row in the
	* display
	* @return the <code>Rectangle</code> the node is drawn in
	*/
	public Rectangle getRowBounds(int row) {
	return getPathBounds(getPathForRow(row));
	}

	/**
	* Makes sure all the path components in path are expanded (except
	* for the last path component) and scrolls so that the
	* node identified by the path is displayed. Only works when this
	* <code>JTree</code> is contained in a <code>JScrollPane</code>.
	*
	* @param path the <code>TreePath</code> identifying the node to
	* bring into view
	*/
	public void scrollPathToVisible(TreePath path) {
	if(path != null) {
	makeVisible(path);

	Rectangle bounds = getPathBounds(path);

	if(bounds != null) {
	scrollRectToVisible(bounds);
	if (accessibleContext != null) {
	((AccessibleJTree)accessibleContext).fireVisibleDataPropertyChange();
	}
	}
	}
	}

	/**
	* Scrolls the item identified by row until it is displayed. The minimum
	* of amount of scrolling necessary to bring the row into view
	* is performed. Only works when this <code>JTree</code> is contained in a
	* <code>JScrollPane</code>.
	*
	* @param row an integer specifying the row to scroll, where 0 is the
	* first row in the display
	*/
	public void scrollRowToVisible(int row) {
	scrollPathToVisible(getPathForRow(row));
	}

	/**
	* Returns the path for the specified row. If <code>row</code> is
	* not visible, or a {@code TreeUI} has not been set, <code>null</code>
	* is returned.
	*
	* @param row an integer specifying a row
	* @return the <code>TreePath</code> to the specified node,
	* <code>null</code> if <code>row < 0</code>
	* or <code>row >= getRowCount()</code>
	*/
	public TreePath getPathForRow(int row) {
	TreeUI tree = getUI();

	if(tree != null)
	return tree.getPathForRow(this, row);
	return null;
	}

	/**
	* Returns the row that displays the node identified by the specified
	* path.
	*
	* @param path the <code>TreePath</code> identifying a node
	* @return an integer specifying the display row, where 0 is the first
	* row in the display, or -1 if any of the elements in path
	* are hidden under a collapsed parent.
	*/
	public int getRowForPath(TreePath path) {
	TreeUI tree = getUI();

	if(tree != null)
	return tree.getRowForPath(this, path);
	return -1;
	}

	/**
	* Ensures that the node identified by the specified path is
	* expanded and viewable. If the last item in the path is a
	* leaf, this will have no effect.
	*
	* @param path the <code>TreePath</code> identifying a node
	*/
	public void expandPath(TreePath path) {
	// Only expand if not leaf!
	TreeModel model = getModel();

	if(path != null && model != null &&
	!model.isLeaf(path.getLastPathComponent())) {
	setExpandedState(path, true);
	}
	}

	/**
	* Ensures that the node in the specified row is expanded and
	* viewable.
	* <p>
	* If <code>row</code> is < 0 or >= <code>getRowCount</code> this
	* will have no effect.
	*
	* @param row an integer specifying a display row, where 0 is the
	* first row in the display
	*/
	public void expandRow(int row) {
	expandPath(getPathForRow(row));
	}

	/**
	* Ensures that the node identified by the specified path is
	* collapsed and viewable.
	*
	* @param path the <code>TreePath</code> identifying a node
	*/
	public void collapsePath(TreePath path) {
	setExpandedState(path, false);
	}

	/**
	* Ensures that the node in the specified row is collapsed.
	* <p>
	* If <code>row</code> is < 0 or >= <code>getRowCount</code> this
	* will have no effect.
	*
	* @param row an integer specifying a display row, where 0 is the
	* first row in the display
	*/
	public void collapseRow(int row) {
	collapsePath(getPathForRow(row));
	}

	/**
	* Returns the path for the node at the specified location.
	*
	* @param x an integer giving the number of pixels horizontally from
	* the left edge of the display area, minus any left margin
	* @param y an integer giving the number of pixels vertically from
	* the top of the display area, minus any top margin
	* @return the <code>TreePath</code> for the node at that location
	*/
	public TreePath getPathForLocation(int x, int y) {
	TreePath closestPath = getClosestPathForLocation(x, y);

	if(closestPath != null) {
	Rectangle pathBounds = getPathBounds(closestPath);

	if(pathBounds != null &&
	x >= pathBounds.x && x < (pathBounds.x + pathBounds.width) &&
	y >= pathBounds.y && y < (pathBounds.y + pathBounds.height))
	return closestPath;
	}
	return null;
	}

	/**
	* Returns the row for the specified location.
	*
	* @param x an integer giving the number of pixels horizontally from
	* the left edge of the display area, minus any left margin
	* @param y an integer giving the number of pixels vertically from
	* the top of the display area, minus any top margin
	* @return the row corresponding to the location, or -1 if the
	* location is not within the bounds of a displayed cell
	* @see #getClosestRowForLocation
	*/
	public int getRowForLocation(int x, int y) {
	return getRowForPath(getPathForLocation(x, y));
	}

	/**
	* Returns the path to the node that is closest to x,y. If
	* no nodes are currently viewable, or there is no model, returns
	* <code>null</code>, otherwise it always returns a valid path. To test if
	* the node is exactly at x, y, get the node's bounds and
	* test x, y against that.
	*
	* @param x an integer giving the number of pixels horizontally from
	* the left edge of the display area, minus any left margin
	* @param y an integer giving the number of pixels vertically from
	* the top of the display area, minus any top margin
	* @return the <code>TreePath</code> for the node closest to that location,
	* <code>null</code> if nothing is viewable or there is no model
	*
	* @see #getPathForLocation
	* @see #getPathBounds
	*/
	public TreePath getClosestPathForLocation(int x, int y) {
	TreeUI tree = getUI();

	if(tree != null)
	return tree.getClosestPathForLocation(this, x, y);
	return null;
	}

	/**
	* Returns the row to the node that is closest to x,y. If no nodes
	* are viewable or there is no model, returns -1. Otherwise,
	* it always returns a valid row. To test if the returned object is
	* exactly at x, y, get the bounds for the node at the returned
	* row and test x, y against that.
	*
	* @param x an integer giving the number of pixels horizontally from
	* the left edge of the display area, minus any left margin
	* @param y an integer giving the number of pixels vertically from
	* the top of the display area, minus any top margin
	* @return the row closest to the location, -1 if nothing is
	* viewable or there is no model
	*
	* @see #getRowForLocation
	* @see #getRowBounds
	*/
	public int getClosestRowForLocation(int x, int y) {
	return getRowForPath(getClosestPathForLocation(x, y));
	}

	/**
	* Returns true if the tree is being edited. The item that is being
	* edited can be obtained using <code>getSelectionPath</code>.
	*
	* @return true if the user is currently editing a node
	* @see #getSelectionPath
	*/
	public boolean isEditing() {
	TreeUI tree = getUI();

	if(tree != null)
	return tree.isEditing(this);
	return false;
	}

	/**
	* Ends the current editing session.
	* (The <code>DefaultTreeCellEditor</code>
	* object saves any edits that are currently in progress on a cell.
	* Other implementations may operate differently.)
	* Has no effect if the tree isn't being edited.
	* <blockquote>
	* <b>Note:</b><br>
	* To make edit-saves automatic whenever the user changes
	* their position in the tree, use {@link #setInvokesStopCellEditing}.
	* </blockquote>
	*
	* @return true if editing was in progress and is now stopped,
	* false if editing was not in progress
	*/
	public boolean stopEditing() {
	TreeUI tree = getUI();

	if(tree != null)
	return tree.stopEditing(this);
	return false;
	}

	/**
	* Cancels the current editing session. Has no effect if the
	* tree isn't being edited.
	*/
	public void cancelEditing() {
	TreeUI tree = getUI();

	if(tree != null)
	tree.cancelEditing(this);
	}

	/**
	* Selects the node identified by the specified path and initiates
	* editing. The edit-attempt fails if the <code>CellEditor</code>
	* does not allow
	* editing for the specified item.
	*
	* @param path the <code>TreePath</code> identifying a node
	*/
	public void startEditingAtPath(TreePath path) {
	TreeUI tree = getUI();

	if(tree != null)
	tree.startEditingAtPath(this, path);
	}

	/**
	* Returns the path to the element that is currently being edited.
	*
	* @return the <code>TreePath</code> for the node being edited
	*/
	public TreePath getEditingPath() {
	TreeUI tree = getUI();

	if(tree != null)
	return tree.getEditingPath(this);
	return null;
	}

	//
	// Following are primarily convenience methods for mapping from
	// row based selections to path selections. Sometimes it is
	// easier to deal with these than paths (mouse downs, key downs
	// usually just deal with index based selections).
	// Since row based selections require a UI many of these won't work
	// without one.
	//

	/**
	* Sets the tree's selection model. When a <code>null</code> value is
	* specified an empty
	* <code>selectionModel</code> is used, which does not allow selections.
	* <p>
	* This is a bound property.
	*
	* @param selectionModel the <code>TreeSelectionModel</code> to use,
	* or <code>null</code> to disable selections
	* @see TreeSelectionModel
	* @beaninfo
	* bound: true
	* description: The tree's selection model.
	*/
	public void setSelectionModel(TreeSelectionModel selectionModel) {
	if(selectionModel == null)
	selectionModel = EmptySelectionModel.sharedInstance();

	TreeSelectionModel oldValue = this.selectionModel;

	if (this.selectionModel != null && selectionRedirector != null) {
	this.selectionModel.removeTreeSelectionListener
	(selectionRedirector);
	}
	if (accessibleContext != null) {
	this.selectionModel.removeTreeSelectionListener((TreeSelectionListener)accessibleContext);
	selectionModel.addTreeSelectionListener((TreeSelectionListener)accessibleContext);
	}

	this.selectionModel = selectionModel;
	if (selectionRedirector != null) {
	this.selectionModel.addTreeSelectionListener(selectionRedirector);
	}
	firePropertyChange(SELECTION_MODEL_PROPERTY, oldValue,
	this.selectionModel);

	if (accessibleContext != null) {
	accessibleContext.firePropertyChange(
	AccessibleContext.ACCESSIBLE_SELECTION_PROPERTY,
	Boolean.valueOf(false), Boolean.valueOf(true));
	}
	}

	/**
	* Returns the model for selections. This should always return a
	* non-<code>null</code> value. If you don't want to allow anything
	* to be selected
	* set the selection model to <code>null</code>, which forces an empty
	* selection model to be used.
	*
	* @see #setSelectionModel
	*/
	public TreeSelectionModel getSelectionModel() {
	return selectionModel;
	}

	/**
	* Returns the paths (inclusive) between the specified rows. If
	* the specified indices are within the viewable set of rows, or
	* bound the viewable set of rows, then the indices are
	* constrained by the viewable set of rows. If the specified
	* indices are not within the viewable set of rows, or do not
	* bound the viewable set of rows, then an empty array is
	* returned. For example, if the row count is {@code 10}, and this
	* method is invoked with {@code -1, 20}, then the specified
	* indices are constrained to the viewable set of rows, and this is
	* treated as if invoked with {@code 0, 9}. On the other hand, if
	* this were invoked with {@code -10, -1}, then the specified
	* indices do not bound the viewable set of rows, and an empty
	* array is returned.
	* <p>
	* The parameters are not order dependent. That is, {@code
	* getPathBetweenRows(x, y)} is equivalent to
	* {@code getPathBetweenRows(y, x)}.
	* <p>
	* An empty array is returned if the row count is {@code 0}, or
	* the specified indices do not bound the viewable set of rows.
	*
	* @param index0 the first index in the range
	* @param index1 the last index in the range
	* @return the paths (inclusive) between the specified row indices
	*/
	protected TreePath[] getPathBetweenRows(int index0, int index1) {
	TreeUI tree = getUI();
	if (tree != null) {
	int rowCount = getRowCount();
	if (rowCount > 0 && !((index0 < 0 && index1 < 0) \|\|
	(index0 >= rowCount && index1 >= rowCount))){
	index0 = Math.min(rowCount - 1, Math.max(index0, 0));
	index1 = Math.min(rowCount - 1, Math.max(index1, 0));
	int minIndex = Math.min(index0, index1);
	int maxIndex = Math.max(index0, index1);
	TreePath[] selection = new TreePath[
	maxIndex - minIndex + 1];
	for(int counter = minIndex; counter <= maxIndex; counter++) {
	selection[counter - minIndex] =
	tree.getPathForRow(this, counter);
	}
	return selection;
	}
	}
	return new TreePath[0];
	}

	/**
	* Selects the rows in the specified interval (inclusive). If
	* the specified indices are within the viewable set of rows, or bound
	* the viewable set of rows, then the specified rows are constrained by
	* the viewable set of rows. If the specified indices are not within the
	* viewable set of rows, or do not bound the viewable set of rows, then
	* the selection is cleared. For example, if the row count is {@code
	* 10}, and this method is invoked with {@code -1, 20}, then the
	* specified indices bounds the viewable range, and this is treated as
	* if invoked with {@code 0, 9}. On the other hand, if this were
	* invoked with {@code -10, -1}, then the specified indices do not
	* bound the viewable set of rows, and the selection is cleared.
	* <p>
	* The parameters are not order dependent. That is, {@code
	* setSelectionInterval(x, y)} is equivalent to
	* {@code setSelectionInterval(y, x)}.
	*
	* @param index0 the first index in the range to select
	* @param index1 the last index in the range to select
	*/
	public void setSelectionInterval(int index0, int index1) {
	TreePath[] paths = getPathBetweenRows(index0, index1);

	this.getSelectionModel().setSelectionPaths(paths);
	}

	/**
	* Adds the specified rows (inclusive) to the selection. If the
	* specified indices are within the viewable set of rows, or bound
	* the viewable set of rows, then the specified indices are
	* constrained by the viewable set of rows. If the indices are not
	* within the viewable set of rows, or do not bound the viewable
	* set of rows, then the selection is unchanged. For example, if
	* the row count is {@code 10}, and this method is invoked with
	* {@code -1, 20}, then the specified indices bounds the viewable
	* range, and this is treated as if invoked with {@code 0, 9}. On
	* the other hand, if this were invoked with {@code -10, -1}, then
	* the specified indices do not bound the viewable set of rows,
	* and the selection is unchanged.
	* <p>
	* The parameters are not order dependent. That is, {@code
	* addSelectionInterval(x, y)} is equivalent to
	* {@code addSelectionInterval(y, x)}.
	*
	* @param index0 the first index in the range to add to the selection
	* @param index1 the last index in the range to add to the selection
	*/
	public void addSelectionInterval(int index0, int index1) {
	TreePath[] paths = getPathBetweenRows(index0, index1);

	if (paths != null && paths.length > 0) {
	this.getSelectionModel().addSelectionPaths(paths);
	}
	}

	/**
	* Removes the specified rows (inclusive) from the selection. If
	* the specified indices are within the viewable set of rows, or bound
	* the viewable set of rows, then the specified indices are constrained by
	* the viewable set of rows. If the specified indices are not within the
	* viewable set of rows, or do not bound the viewable set of rows, then
	* the selection is unchanged. For example, if the row count is {@code
	* 10}, and this method is invoked with {@code -1, 20}, then the
	* specified range bounds the viewable range, and this is treated as
	* if invoked with {@code 0, 9}. On the other hand, if this were
	* invoked with {@code -10, -1}, then the specified range does not
	* bound the viewable set of rows, and the selection is unchanged.
	* <p>
	* The parameters are not order dependent. That is, {@code
	* removeSelectionInterval(x, y)} is equivalent to
	* {@code removeSelectionInterval(y, x)}.
	*
	* @param index0 the first row to remove from the selection
	* @param index1 the last row to remove from the selection
	*/
	public void removeSelectionInterval(int index0, int index1) {
	TreePath[] paths = getPathBetweenRows(index0, index1);

	if (paths != null && paths.length > 0) {
	this.getSelectionModel().removeSelectionPaths(paths);
	}
	}

	/**
	* Removes the node identified by the specified path from the current
	* selection.
	*
	* @param path the <code>TreePath</code> identifying a node
	*/
	public void removeSelectionPath(TreePath path) {
	this.getSelectionModel().removeSelectionPath(path);
	}

	/**
	* Removes the nodes identified by the specified paths from the
	* current selection.
	*
	* @param paths an array of <code>TreePath</code> objects that
	* specifies the nodes to remove
	*/
	public void removeSelectionPaths(TreePath[] paths) {
	this.getSelectionModel().removeSelectionPaths(paths);
	}

	/**
	* Removes the row at the index <code>row</code> from the current
	* selection.
	*
	* @param row the row to remove
	*/
	public void removeSelectionRow(int row) {
	int[] rows = { row };

	removeSelectionRows(rows);
	}

	/**
	* Removes the rows that are selected at each of the specified
	* rows.
	*
	* @param rows an array of ints specifying display rows, where 0 is
	* the first row in the display
	*/
	public void removeSelectionRows(int[] rows) {
	TreeUI ui = getUI();

	if(ui != null && rows != null) {
	int numRows = rows.length;
	TreePath[] paths = new TreePath[numRows];

	for(int counter = 0; counter < numRows; counter++)
	paths[counter] = ui.getPathForRow(this, rows[counter]);
	removeSelectionPaths(paths);
	}
	}

	/**
	* Clears the selection.
	*/
	public void clearSelection() {
	getSelectionModel().clearSelection();
	}

	/**
	* Returns true if the selection is currently empty.
	*
	* @return true if the selection is currently empty
	*/
	public boolean isSelectionEmpty() {
	return getSelectionModel().isSelectionEmpty();
	}

	/**
	* Adds a listener for <code>TreeExpansion</code> events.
	*
	* @param tel a TreeExpansionListener that will be notified when
	* a tree node is expanded or collapsed (a "negative
	* expansion")
	*/
	public void addTreeExpansionListener(TreeExpansionListener tel) {
	if (settingUI) {
	uiTreeExpansionListener = tel;
	}
	listenerList.add(TreeExpansionListener.class, tel);
	}

	/**
	* Removes a listener for <code>TreeExpansion</code> events.
	*
	* @param tel the <code>TreeExpansionListener</code> to remove
	*/
	public void removeTreeExpansionListener(TreeExpansionListener tel) {
	listenerList.remove(TreeExpansionListener.class, tel);
	if (uiTreeExpansionListener == tel) {
	uiTreeExpansionListener = null;
	}
	}

	/**
	* Returns an array of all the <code>TreeExpansionListener</code>s added
	* to this JTree with addTreeExpansionListener().
	*
	* @return all of the <code>TreeExpansionListener</code>s added or an empty
	* array if no listeners have been added
	* @since 1.4
	*/
	public TreeExpansionListener[] getTreeExpansionListeners() {
	return listenerList.getListeners(TreeExpansionListener.class);
	}

	/**
	* Adds a listener for <code>TreeWillExpand</code> events.
	*
	* @param tel a <code>TreeWillExpandListener</code> that will be notified
	* when a tree node will be expanded or collapsed (a "negative
	* expansion")
	*/
	public void addTreeWillExpandListener(TreeWillExpandListener tel) {
	listenerList.add(TreeWillExpandListener.class, tel);
	}

	/**
	* Removes a listener for <code>TreeWillExpand</code> events.
	*
	* @param tel the <code>TreeWillExpandListener</code> to remove
	*/
	public void removeTreeWillExpandListener(TreeWillExpandListener tel) {
	listenerList.remove(TreeWillExpandListener.class, tel);
	}

	/**
	* Returns an array of all the <code>TreeWillExpandListener</code>s added
	* to this JTree with addTreeWillExpandListener().
	*
	* @return all of the <code>TreeWillExpandListener</code>s added or an empty
	* array if no listeners have been added
	* @since 1.4
	*/
	public TreeWillExpandListener[] getTreeWillExpandListeners() {
	return listenerList.getListeners(TreeWillExpandListener.class);
	}

	/**
	* Notifies all listeners that have registered interest for
	* notification on this event type. The event instance
	* is lazily created using the <code>path</code> parameter.
	*
	* @param path the <code>TreePath</code> indicating the node that was
	* expanded
	* @see EventListenerList
	*/
	public void fireTreeExpanded(TreePath path) {
	// Guaranteed to return a non-null array
	Object[] listeners = listenerList.getListenerList();
	TreeExpansionEvent e = null;
	if (uiTreeExpansionListener != null) {
	e = new TreeExpansionEvent(this, path);
	uiTreeExpansionListener.treeExpanded(e);
	}
	// Process the listeners last to first, notifying
	// those that are interested in this event
	for (int i = listeners.length-2; i>=0; i-=2) {
	if (listeners[i]==TreeExpansionListener.class &&
	listeners[i + 1] != uiTreeExpansionListener) {
	// Lazily create the event:
	if (e == null)
	e = new TreeExpansionEvent(this, path);
	((TreeExpansionListener)listeners[i+1]).
	treeExpanded(e);
	}
	}
	}

	/**
	* Notifies all listeners that have registered interest for
	* notification on this event type. The event instance
	* is lazily created using the <code>path</code> parameter.
	*
	* @param path the <code>TreePath</code> indicating the node that was
	* collapsed
	* @see EventListenerList
	*/
	public void fireTreeCollapsed(TreePath path) {
	// Guaranteed to return a non-null array
	Object[] listeners = listenerList.getListenerList();
	TreeExpansionEvent e = null;
	if (uiTreeExpansionListener != null) {
	e = new TreeExpansionEvent(this, path);
	uiTreeExpansionListener.treeCollapsed(e);
	}
	// Process the listeners last to first, notifying
	// those that are interested in this event
	for (int i = listeners.length-2; i>=0; i-=2) {
	if (listeners[i]==TreeExpansionListener.class &&
	listeners[i + 1] != uiTreeExpansionListener) {
	// Lazily create the event:
	if (e == null)
	e = new TreeExpansionEvent(this, path);
	((TreeExpansionListener)listeners[i+1]).
	treeCollapsed(e);
	}
	}
	}

	/**
	* Notifies all listeners that have registered interest for
	* notification on this event type. The event instance
	* is lazily created using the <code>path</code> parameter.
	*
	* @param path the <code>TreePath</code> indicating the node that was
	* expanded
	* @see EventListenerList
	*/
	public void fireTreeWillExpand(TreePath path) throws ExpandVetoException {
	// Guaranteed to return a non-null array
	Object[] listeners = listenerList.getListenerList();
	TreeExpansionEvent e = null;
	// Process the listeners last to first, notifying
	// those that are interested in this event
	for (int i = listeners.length-2; i>=0; i-=2) {
	if (listeners[i]==TreeWillExpandListener.class) {
	// Lazily create the event:
	if (e == null)
	e = new TreeExpansionEvent(this, path);
	((TreeWillExpandListener)listeners[i+1]).
	treeWillExpand(e);
	}
	}
	}

	/**
	* Notifies all listeners that have registered interest for
	* notification on this event type. The event instance
	* is lazily created using the <code>path</code> parameter.
	*
	* @param path the <code>TreePath</code> indicating the node that was
	* expanded
	* @see EventListenerList
	*/
	public void fireTreeWillCollapse(TreePath path) throws ExpandVetoException {
	// Guaranteed to return a non-null array
	Object[] listeners = listenerList.getListenerList();
	TreeExpansionEvent e = null;
	// Process the listeners last to first, notifying
	// those that are interested in this event
	for (int i = listeners.length-2; i>=0; i-=2) {
	if (listeners[i]==TreeWillExpandListener.class) {
	// Lazily create the event:
	if (e == null)
	e = new TreeExpansionEvent(this, path);
	((TreeWillExpandListener)listeners[i+1]).
	treeWillCollapse(e);
	}
	}
	}

	/**
	* Adds a listener for <code>TreeSelection</code> events.
	*
	* @param tsl the <code>TreeSelectionListener</code> that will be notified
	* when a node is selected or deselected (a "negative
	* selection")
	*/
	public void addTreeSelectionListener(TreeSelectionListener tsl) {
	listenerList.add(TreeSelectionListener.class,tsl);
	if(listenerList.getListenerCount(TreeSelectionListener.class) != 0
	&& selectionRedirector == null) {
	selectionRedirector = new TreeSelectionRedirector();
	selectionModel.addTreeSelectionListener(selectionRedirector);
	}
	}

	/**
	* Removes a <code>TreeSelection</code> listener.
	*
	* @param tsl the <code>TreeSelectionListener</code> to remove
	*/
	public void removeTreeSelectionListener(TreeSelectionListener tsl) {
	listenerList.remove(TreeSelectionListener.class,tsl);
	if(listenerList.getListenerCount(TreeSelectionListener.class) == 0
	&& selectionRedirector != null) {
	selectionModel.removeTreeSelectionListener
	(selectionRedirector);
	selectionRedirector = null;
	}
	}

	/**
	* Returns an array of all the <code>TreeSelectionListener</code>s added
	* to this JTree with addTreeSelectionListener().
	*
	* @return all of the <code>TreeSelectionListener</code>s added or an empty
	* array if no listeners have been added
	* @since 1.4
	*/
	public TreeSelectionListener[] getTreeSelectionListeners() {
	return listenerList.getListeners(TreeSelectionListener.class);
	}

	/**
	* Notifies all listeners that have registered interest for
	* notification on this event type.
	*
	* @param e the <code>TreeSelectionEvent</code> to be fired;
	* generated by the
	* <code>TreeSelectionModel</code>
	* when a node is selected or deselected
	* @see EventListenerList
	*/
	protected void fireValueChanged(TreeSelectionEvent e) {
	// Guaranteed to return a non-null array
	Object[] listeners = listenerList.getListenerList();
	// Process the listeners last to first, notifying
	// those that are interested in this event
	for (int i = listeners.length-2; i>=0; i-=2) {
	// TreeSelectionEvent e = null;
	if (listeners[i]==TreeSelectionListener.class) {
	// Lazily create the event:
	// if (e == null)
	// e = new ListSelectionEvent(this, firstIndex, lastIndex);
	((TreeSelectionListener)listeners[i+1]).valueChanged(e);
	}
	}
	}

	/**
	* Sent when the tree has changed enough that we need to resize
	* the bounds, but not enough that we need to remove the
	* expanded node set (e.g nodes were expanded or collapsed, or
	* nodes were inserted into the tree). You should never have to
	* invoke this, the UI will invoke this as it needs to.
	*/
	public void treeDidChange() {
	revalidate();
	repaint();
	}

	/**
	* Sets the number of rows that are to be displayed.
	* This will only work if the tree is contained in a
	* <code>JScrollPane</code>,
	* and will adjust the preferred size and size of that scrollpane.
	* <p>
	* This is a bound property.
	*
	* @param newCount the number of rows to display
	* @beaninfo
	* bound: true
	* description: The number of rows that are to be displayed.
	*/
	public void setVisibleRowCount(int newCount) {
	int oldCount = visibleRowCount;

	visibleRowCount = newCount;
	firePropertyChange(VISIBLE_ROW_COUNT_PROPERTY, oldCount,
	visibleRowCount);
	invalidate();
	if (accessibleContext != null) {
	((AccessibleJTree)accessibleContext).fireVisibleDataPropertyChange();
	}
	}

	/**
	* Returns the number of rows that are displayed in the display area.
	*
	* @return the number of rows displayed
	*/
	public int getVisibleRowCount() {
	return visibleRowCount;
	}

	/**
	* Expands the root path, assuming the current TreeModel has been set.
	*/
	private void expandRoot() {
	TreeModel model = getModel();

	if(model != null && model.getRoot() != null) {
	expandPath(new TreePath(model.getRoot()));
	}
	}

	/**
	* Returns the TreePath to the next tree element that
	* begins with a prefix. To handle the conversion of a
	* <code>TreePath</code> into a String, <code>convertValueToText</code>
	* is used.
	*
	* @param prefix the string to test for a match
	* @param startingRow the row for starting the search
	* @param bias the search direction, either
	* Position.Bias.Forward or Position.Bias.Backward.
	* @return the TreePath of the next tree element that
	* starts with the prefix; otherwise null
	* @exception IllegalArgumentException if prefix is null
	* or startingRow is out of bounds
	* @since 1.4
	*/
	public TreePath getNextMatch(String prefix, int startingRow,
	Position.Bias bias) {

	int max = getRowCount();
	if (prefix == null) {
	throw new IllegalArgumentException();
	}
	if (startingRow < 0 \|\| startingRow >= max) {
	throw new IllegalArgumentException();
	}
	prefix = prefix.toUpperCase();

	// start search from the next/previous element froom the
	// selected element
	int increment = (bias == Position.Bias.Forward) ? 1 : -1;
	int row = startingRow;
	do {
	TreePath path = getPathForRow(row);
	String text = convertValueToText(
	path.getLastPathComponent(), isRowSelected(row),
	isExpanded(row), true, row, false);

	if (text.toUpperCase().startsWith(prefix)) {
	return path;
	}
	row = (row + increment + max) % max;
	} while (row != startingRow);
	return null;
	}

	// Serialization support.
	private void writeObject(ObjectOutputStream s) throws IOException {
	Vector<Object> values = new Vector<Object>();

	s.defaultWriteObject();
	// Save the cellRenderer, if its Serializable.
	if(cellRenderer != null && cellRenderer instanceof Serializable) {
	values.addElement("cellRenderer");
	values.addElement(cellRenderer);
	}
	// Save the cellEditor, if its Serializable.
	if(cellEditor != null && cellEditor instanceof Serializable) {
	values.addElement("cellEditor");
	values.addElement(cellEditor);
	}
	// Save the treeModel, if its Serializable.
	if(treeModel != null && treeModel instanceof Serializable) {
	values.addElement("treeModel");
	values.addElement(treeModel);
	}
	// Save the selectionModel, if its Serializable.
	if(selectionModel != null && selectionModel instanceof Serializable) {
	values.addElement("selectionModel");
	values.addElement(selectionModel);
	}

	Object expandedData = getArchivableExpandedState();

	if(expandedData != null) {
	values.addElement("expandedState");
	values.addElement(expandedData);
	}

	s.writeObject(values);
	if (getUIClassID().equals(uiClassID)) {
	byte count = JComponent.getWriteObjCounter(this);
	JComponent.setWriteObjCounter(this, --count);
	if (count == 0 && ui != null) {
	ui.installUI(this);
	}
	}
	}

	private void readObject(ObjectInputStream s)
	throws IOException, ClassNotFoundException {
	s.defaultReadObject();

	// Create an instance of expanded state.

	expandedState = new Hashtable<TreePath, Boolean>();

	expandedStack = new Stack<Stack<TreePath>>();

	Vector<?> values = (Vector)s.readObject();
	int indexCounter = 0;
	int maxCounter = values.size();

	if(indexCounter < maxCounter && values.elementAt(indexCounter).
	equals("cellRenderer")) {
	cellRenderer = (TreeCellRenderer)values.elementAt(++indexCounter);
	indexCounter++;
	}
	if(indexCounter < maxCounter && values.elementAt(indexCounter).
	equals("cellEditor")) {
	cellEditor = (TreeCellEditor)values.elementAt(++indexCounter);
	indexCounter++;
	}
	if(indexCounter < maxCounter && values.elementAt(indexCounter).
	equals("treeModel")) {
	treeModel = (TreeModel)values.elementAt(++indexCounter);
	indexCounter++;
	}
	if(indexCounter < maxCounter && values.elementAt(indexCounter).
	equals("selectionModel")) {
	selectionModel = (TreeSelectionModel)values.elementAt(++indexCounter);
	indexCounter++;
	}
	if(indexCounter < maxCounter && values.elementAt(indexCounter).
	equals("expandedState")) {
	unarchiveExpandedState(values.elementAt(++indexCounter));
	indexCounter++;
	}
	// Reinstall the redirector.
	if(listenerList.getListenerCount(TreeSelectionListener.class) != 0) {
	selectionRedirector = new TreeSelectionRedirector();
	selectionModel.addTreeSelectionListener(selectionRedirector);
	}
	// Listener to TreeModel.
	if(treeModel != null) {
	treeModelListener = createTreeModelListener();
	if(treeModelListener != null)
	treeModel.addTreeModelListener(treeModelListener);
	}
	}

	/**
	* Returns an object that can be archived indicating what nodes are
	* expanded and what aren't. The objects from the model are NOT
	* written out.
	*/
	private Object getArchivableExpandedState() {
	TreeModel model = getModel();

	if(model != null) {
	Enumeration<TreePath> paths = expandedState.keys();

	if(paths != null) {
	Vector<Object> state = new Vector<Object>();

	while(paths.hasMoreElements()) {
	TreePath path = paths.nextElement();
	Object archivePath;

	try {
	archivePath = getModelIndexsForPath(path);
	} catch (Error error) {
	archivePath = null;
	}
	if(archivePath != null) {
	state.addElement(archivePath);
	state.addElement(expandedState.get(path));
	}
	}
	return state;
	}
	}
	return null;
	}

	/**
	* Updates the expanded state of nodes in the tree based on the
	* previously archived state <code>state</code>.
	*/
	private void unarchiveExpandedState(Object state) {
	if(state instanceof Vector) {
	Vector<?> paths = (Vector)state;

	for(int counter = paths.size() - 1; counter >= 0; counter--) {
	Boolean eState = (Boolean)paths.elementAt(counter--);
	TreePath path;

	try {
	path = getPathForIndexs((int[])paths.elementAt(counter));
	if(path != null)
	expandedState.put(path, eState);
	} catch (Error error) {}
	}
	}
	}

	/**
	* Returns an array of integers specifying the indexs of the
	* components in the <code>path</code>. If <code>path</code> is
	* the root, this will return an empty array. If <code>path</code>
	* is <code>null</code>, <code>null</code> will be returned.
	*/
	private int[] getModelIndexsForPath(TreePath path) {
	if(path != null) {
	TreeModel model = getModel();
	int count = path.getPathCount();
	int[] indexs = new int[count - 1];
	Object parent = model.getRoot();

	for(int counter = 1; counter < count; counter++) {
	indexs[counter - 1] = model.getIndexOfChild
	(parent, path.getPathComponent(counter));
	parent = path.getPathComponent(counter);
	if(indexs[counter - 1] < 0)
	return null;
	}
	return indexs;
	}
	return null;
	}

	/**
	* Returns a <code>TreePath</code> created by obtaining the children
	* for each of the indices in <code>indexs</code>. If <code>indexs</code>
	* or the <code>TreeModel</code> is <code>null</code>, it will return
	* <code>null</code>.
	*/
	private TreePath getPathForIndexs(int[] indexs) {
	if(indexs == null)
	return null;

	TreeModel model = getModel();

	if(model == null)
	return null;

	int count = indexs.length;
	Object parent = model.getRoot();
	if (parent == null)
	return null;

	TreePath parentPath = new TreePath(parent);

	for(int counter = 0; counter < count; counter++) {
	parent = model.getChild(parent, indexs[counter]);
	if(parent == null)
	return null;
	parentPath = parentPath.pathByAddingChild(parent);
	}
	return parentPath;
	}

	/**
	* <code>EmptySelectionModel</code> is a <code>TreeSelectionModel</code>
	* that does not allow anything to be selected.
	* <p>
	* <strong>Warning:</strong>
	* Serialized objects of this class will not be compatible with
	* future Swing releases. The current serialization support is
	* appropriate for short term storage or RMI between applications running
	* the same version of Swing. As of 1.4, support for long term storage
	* of all JavaBeans™
	* has been added to the <code>java.beans</code> package.
	* Please see {@link java.beans.XMLEncoder}.
	*/
	@SuppressWarnings("serial")
	protected static class EmptySelectionModel extends
	DefaultTreeSelectionModel
	{
	/**
	* The single instance of {@code EmptySelectionModel}.
	*/
	protected static final EmptySelectionModel sharedInstance =
	new EmptySelectionModel();

	/**
	* Returns the single instance of {@code EmptySelectionModel}.
	*
	* @return single instance of {@code EmptySelectionModel}
	*/
	static public EmptySelectionModel sharedInstance() {
	return sharedInstance;
	}

	/**
	* This is overriden to do nothing; {@code EmptySelectionModel}
	* does not allow a selection.
	*
	* @param paths the paths to select; this is ignored
	*/
	public void setSelectionPaths(TreePath[] paths) {}

	/**
	* This is overriden to do nothing; {@code EmptySelectionModel}
	* does not allow a selection.
	*
	* @param paths the paths to add to the selection; this is ignored
	*/
	public void addSelectionPaths(TreePath[] paths) {}

	/**
	* This is overriden to do nothing; {@code EmptySelectionModel}
	* does not allow a selection.
	*
	* @param paths the paths to remove; this is ignored
	*/
	public void removeSelectionPaths(TreePath[] paths) {}

	/**
	* This is overriden to do nothing; {@code EmptySelectionModel}
	* does not allow a selection.
	*
	* @param mode the selection mode; this is ignored
	* @since 1.7
	*/
	public void setSelectionMode(int mode) {
	}

	/**
	* This is overriden to do nothing; {@code EmptySelectionModel}
	* does not allow a selection.
	*
	* @param mapper the {@code RowMapper} instance; this is ignored
	* @since 1.7
	*/
	public void setRowMapper(RowMapper mapper) {
	}

	/**
	* This is overriden to do nothing; {@code EmptySelectionModel}
	* does not allow a selection.
	*
	* @param listener the listener to add; this is ignored
	* @since 1.7
	*/
	public void addTreeSelectionListener(TreeSelectionListener listener) {
	}

	/**
	* This is overriden to do nothing; {@code EmptySelectionModel}
	* does not allow a selection.
	*
	* @param listener the listener to remove; this is ignored
	* @since 1.7
	*/
	public void removeTreeSelectionListener(
	TreeSelectionListener listener) {
	}

	/**
	* This is overriden to do nothing; {@code EmptySelectionModel}
	* does not allow a selection.
	*
	* @param listener the listener to add; this is ignored
	* @since 1.7
	*/
	public void addPropertyChangeListener(
	PropertyChangeListener listener) {
	}

	/**
	* This is overriden to do nothing; {@code EmptySelectionModel}
	* does not allow a selection.
	*
	* @param listener the listener to remove; this is ignored
	* @since 1.7
	*/
	public void removePropertyChangeListener(
	PropertyChangeListener listener) {
	}
	}


	/**
	* Handles creating a new <code>TreeSelectionEvent</code> with the
	* <code>JTree</code> as the
	* source and passing it off to all the listeners.
	* <p>
	* <strong>Warning:</strong>
	* Serialized objects of this class will not be compatible with
	* future Swing releases. The current serialization support is
	* appropriate for short term storage or RMI between applications running
	* the same version of Swing. As of 1.4, support for long term storage
	* of all JavaBeans™
	* has been added to the <code>java.beans</code> package.
	* Please see {@link java.beans.XMLEncoder}.
	*/
	@SuppressWarnings("serial")
	protected class TreeSelectionRedirector implements Serializable,
	TreeSelectionListener
	{
	/**
	* Invoked by the <code>TreeSelectionModel</code> when the
	* selection changes.
	*
	* @param e the <code>TreeSelectionEvent</code> generated by the
	* <code>TreeSelectionModel</code>
	*/
	public void valueChanged(TreeSelectionEvent e) {
	TreeSelectionEvent newE;

	newE = (TreeSelectionEvent)e.cloneWithSource(JTree.this);
	fireValueChanged(newE);
	}
	} // End of class JTree.TreeSelectionRedirector

	//
	// Scrollable interface
	//

	/**
	* Returns the preferred display size of a <code>JTree</code>. The height is
	* determined from <code>getVisibleRowCount</code> and the width
	* is the current preferred width.
	*
	* @return a <code>Dimension</code> object containing the preferred size
	*/
	public Dimension getPreferredScrollableViewportSize() {
	int width = getPreferredSize().width;
	int visRows = getVisibleRowCount();
	int height = -1;

	if(isFixedRowHeight())
	height = visRows * getRowHeight();
	else {
	TreeUI ui = getUI();

	if (ui != null && visRows > 0) {
	int rc = ui.getRowCount(this);

	if (rc >= visRows) {
	Rectangle bounds = getRowBounds(visRows - 1);
	if (bounds != null) {
	height = bounds.y + bounds.height;
	}
	}
	else if (rc > 0) {
	Rectangle bounds = getRowBounds(0);
	if (bounds != null) {
	height = bounds.height * visRows;
	}
	}
	}
	if (height == -1) {
	height = 16 * visRows;
	}
	}
	return new Dimension(width, height);
	}

	/**
	* Returns the amount to increment when scrolling. The amount is
	* the height of the first displayed row that isn't completely in view
	* or, if it is totally displayed, the height of the next row in the
	* scrolling direction.
	*
	* @param visibleRect the view area visible within the viewport
	* @param orientation either <code>SwingConstants.VERTICAL</code>
	* or <code>SwingConstants.HORIZONTAL</code>
	* @param direction less than zero to scroll up/left,
	* greater than zero for down/right
	* @return the "unit" increment for scrolling in the specified direction
	* @see JScrollBar#setUnitIncrement(int)
	*/
	public int getScrollableUnitIncrement(Rectangle visibleRect,
	int orientation, int direction) {
	if(orientation == SwingConstants.VERTICAL) {
	Rectangle rowBounds;
	int firstIndex = getClosestRowForLocation
	(0, visibleRect.y);

	if(firstIndex != -1) {
	rowBounds = getRowBounds(firstIndex);
	if(rowBounds.y != visibleRect.y) {
	if(direction < 0) {
	// UP
	return Math.max(0, (visibleRect.y - rowBounds.y));
	}
	return (rowBounds.y + rowBounds.height - visibleRect.y);
	}
	if(direction < 0) { // UP
	if(firstIndex != 0) {
	rowBounds = getRowBounds(firstIndex - 1);
	return rowBounds.height;
	}
	}
	else {
	return rowBounds.height;
	}
	}
	return 0;
	}
	return 4;
	}


	/**
	* Returns the amount for a block increment, which is the height or
	* width of <code>visibleRect</code>, based on <code>orientation</code>.
	*
	* @param visibleRect the view area visible within the viewport
	* @param orientation either <code>SwingConstants.VERTICAL</code>
	* or <code>SwingConstants.HORIZONTAL</code>
	* @param direction less than zero to scroll up/left,
	* greater than zero for down/right.
	* @return the "block" increment for scrolling in the specified direction
	* @see JScrollBar#setBlockIncrement(int)
	*/
	public int getScrollableBlockIncrement(Rectangle visibleRect,
	int orientation, int direction) {
	return (orientation == SwingConstants.VERTICAL) ? visibleRect.height :
	visibleRect.width;
	}

	/**
	* Returns false to indicate that the width of the viewport does not
	* determine the width of the table, unless the preferred width of
	* the tree is smaller than the viewports width. In other words:
	* ensure that the tree is never smaller than its viewport.
	*
	* @return whether the tree should track the width of the viewport
	* @see Scrollable#getScrollableTracksViewportWidth
	*/
	public boolean getScrollableTracksViewportWidth() {
	Container parent = SwingUtilities.getUnwrappedParent(this);
	if (parent instanceof JViewport) {
	return parent.getWidth() > getPreferredSize().width;
	}
	return false;
	}

	/**
	* Returns false to indicate that the height of the viewport does not
	* determine the height of the table, unless the preferred height
	* of the tree is smaller than the viewports height. In other words:
	* ensure that the tree is never smaller than its viewport.
	*
	* @return whether the tree should track the height of the viewport
	* @see Scrollable#getScrollableTracksViewportHeight
	*/
	public boolean getScrollableTracksViewportHeight() {
	Container parent = SwingUtilities.getUnwrappedParent(this);
	if (parent instanceof JViewport) {
	return parent.getHeight() > getPreferredSize().height;
	}
	return false;
	}

	/**
	* Sets the expanded state of this <code>JTree</code>.
	* If <code>state</code> is
	* true, all parents of <code>path</code> and path are marked as
	* expanded. If <code>state</code> is false, all parents of
	* <code>path</code> are marked EXPANDED, but <code>path</code> itself
	* is marked collapsed.<p>
	* This will fail if a <code>TreeWillExpandListener</code> vetos it.
	*/
	protected void setExpandedState(TreePath path, boolean state) {
	if(path != null) {
	// Make sure all parents of path are expanded.
	Stack<TreePath> stack;
	TreePath parentPath = path.getParentPath();

	if (expandedStack.size() == 0) {
	stack = new Stack<TreePath>();
	}
	else {
	stack = expandedStack.pop();
	}

	try {
	while(parentPath != null) {
	if(isExpanded(parentPath)) {
	parentPath = null;
	}
	else {
	stack.push(parentPath);
	parentPath = parentPath.getParentPath();
	}
	}
	for(int counter = stack.size() - 1; counter >= 0; counter--) {
	parentPath = stack.pop();
	if(!isExpanded(parentPath)) {
	try {
	fireTreeWillExpand(parentPath);
	} catch (ExpandVetoException eve) {
	// Expand vetoed!
	return;
	}
	expandedState.put(parentPath, Boolean.TRUE);
	fireTreeExpanded(parentPath);
	if (accessibleContext != null) {
	((AccessibleJTree)accessibleContext).
	fireVisibleDataPropertyChange();
	}
	}
	}
	}
	finally {
	if (expandedStack.size() < TEMP_STACK_SIZE) {
	stack.removeAllElements();
	expandedStack.push(stack);
	}
	}
	if(!state) {
	// collapse last path.
	Object cValue = expandedState.get(path);

	if(cValue != null && ((Boolean)cValue).booleanValue()) {
	try {
	fireTreeWillCollapse(path);
	}
	catch (ExpandVetoException eve) {
	return;
	}
	expandedState.put(path, Boolean.FALSE);
	fireTreeCollapsed(path);
	if (removeDescendantSelectedPaths(path, false) &&
	!isPathSelected(path)) {
	// A descendant was selected, select the parent.
	addSelectionPath(path);
	}
	if (accessibleContext != null) {
	((AccessibleJTree)accessibleContext).
	fireVisibleDataPropertyChange();
	}
	}
	}
	else {
	// Expand last path.
	Object cValue = expandedState.get(path);

	if(cValue == null \|\| !((Boolean)cValue).booleanValue()) {
	try {
	fireTreeWillExpand(path);
	}
	catch (ExpandVetoException eve) {
	return;
	}
	expandedState.put(path, Boolean.TRUE);
	fireTreeExpanded(path);
	if (accessibleContext != null) {
	((AccessibleJTree)accessibleContext).
	fireVisibleDataPropertyChange();
	}
	}
	}
	}
	}

	/**
	* Returns an <code>Enumeration</code> of <code>TreePaths</code>
	* that have been expanded that
	* are descendants of <code>parent</code>.
	*/
	protected Enumeration<TreePath>
	getDescendantToggledPaths(TreePath parent)
	{
	if(parent == null)
	return null;

	Vector<TreePath> descendants = new Vector<TreePath>();
	Enumeration<TreePath> nodes = expandedState.keys();

	while(nodes.hasMoreElements()) {
	TreePath path = nodes.nextElement();
	if(parent.isDescendant(path))
	descendants.addElement(path);
	}
	return descendants.elements();
	}

	/**
	* Removes any descendants of the <code>TreePaths</code> in
	* <code>toRemove</code>
	* that have been expanded.
	*
	* @param toRemove an enumeration of the paths to remove; a value of
	* {@code null} is ignored
	* @throws ClassCastException if {@code toRemove} contains an
	* element that is not a {@code TreePath}; {@code null}
	* values are ignored
	*/
	protected void
	removeDescendantToggledPaths(Enumeration<TreePath> toRemove)
	{
	if(toRemove != null) {
	while(toRemove.hasMoreElements()) {
	Enumeration<?> descendants = getDescendantToggledPaths
	(toRemove.nextElement());

	if(descendants != null) {
	while(descendants.hasMoreElements()) {
	expandedState.remove(descendants.nextElement());
	}
	}
	}
	}
	}

	/**
	* Clears the cache of toggled tree paths. This does NOT send out
	* any <code>TreeExpansionListener</code> events.
	*/
	protected void clearToggledPaths() {
	expandedState.clear();
	}

	/**
	* Creates and returns an instance of <code>TreeModelHandler</code>.
	* The returned
	* object is responsible for updating the expanded state when the
	* <code>TreeModel</code> changes.
	* <p>
	* For more information on what expanded state means, see the
	* <a href=#jtree_description>JTree description</a> above.
	*/
	protected TreeModelListener createTreeModelListener() {
	return new TreeModelHandler();
	}

	/**
	* Removes any paths in the selection that are descendants of
	* <code>path</code>. If <code>includePath</code> is true and
	* <code>path</code> is selected, it will be removed from the selection.
	*
	* @return true if a descendant was selected
	* @since 1.3
	*/
	protected boolean removeDescendantSelectedPaths(TreePath path,
	boolean includePath) {
	TreePath[] toRemove = getDescendantSelectedPaths(path, includePath);

	if (toRemove != null) {
	getSelectionModel().removeSelectionPaths(toRemove);
	return true;
	}
	return false;
	}

	/**
	* Returns an array of paths in the selection that are descendants of
	* <code>path</code>. The returned array may contain <code>null</code>s.
	*/
	private TreePath[] getDescendantSelectedPaths(TreePath path,
	boolean includePath) {
	TreeSelectionModel sm = getSelectionModel();
	TreePath[] selPaths = (sm != null) ? sm.getSelectionPaths() :
	null;

	if(selPaths != null) {
	boolean shouldRemove = false;

	for(int counter = selPaths.length - 1; counter >= 0; counter--) {
	if(selPaths[counter] != null &&
	path.isDescendant(selPaths[counter]) &&
	(!path.equals(selPaths[counter]) \|\| includePath))
	shouldRemove = true;
	else
	selPaths[counter] = null;
	}
	if(!shouldRemove) {
	selPaths = null;
	}
	return selPaths;
	}
	return null;
	}

	/**
	* Removes any paths from the selection model that are descendants of
	* the nodes identified by in <code>e</code>.
	*/
	void removeDescendantSelectedPaths(TreeModelEvent e) {
	TreePath pPath = SwingUtilities2.getTreePath(e, getModel());
	Object[] oldChildren = e.getChildren();
	TreeSelectionModel sm = getSelectionModel();

	if (sm != null && pPath != null && oldChildren != null &&
	oldChildren.length > 0) {
	for (int counter = oldChildren.length - 1; counter >= 0;
	counter--) {
	// Might be better to call getDescendantSelectedPaths
	// numerous times, then push to the model.
	removeDescendantSelectedPaths(pPath.pathByAddingChild
	(oldChildren[counter]), true);
	}
	}
	}


	/**
	* Listens to the model and updates the <code>expandedState</code>
	* accordingly when nodes are removed, or changed.
	*/
	protected class TreeModelHandler implements TreeModelListener {
	public void treeNodesChanged(TreeModelEvent e) { }

	public void treeNodesInserted(TreeModelEvent e) { }

	public void treeStructureChanged(TreeModelEvent e) {
	if(e == null)
	return;

	// NOTE: If I change this to NOT remove the descendants
	// and update BasicTreeUIs treeStructureChanged method
	// to update descendants in response to a treeStructureChanged
	// event, all the children of the event won't collapse!
	TreePath parent = SwingUtilities2.getTreePath(e, getModel());

	if(parent == null)
	return;

	if (parent.getPathCount() == 1) {
	// New root, remove everything!
	clearToggledPaths();
	Object treeRoot = treeModel.getRoot();
	if(treeRoot != null &&
	!treeModel.isLeaf(treeRoot)) {
	// Mark the root as expanded, if it isn't a leaf.
	expandedState.put(parent, Boolean.TRUE);
	}
	}
	else if(expandedState.get(parent) != null) {
	Vector<TreePath> toRemove = new Vector<TreePath>(1);
	boolean isExpanded = isExpanded(parent);

	toRemove.addElement(parent);
	removeDescendantToggledPaths(toRemove.elements());
	if(isExpanded) {
	TreeModel model = getModel();

	if(model == null \|\| model.isLeaf
	(parent.getLastPathComponent()))
	collapsePath(parent);
	else
	expandedState.put(parent, Boolean.TRUE);
	}
	}
	removeDescendantSelectedPaths(parent, false);
	}

	public void treeNodesRemoved(TreeModelEvent e) {
	if(e == null)
	return;

	TreePath parent = SwingUtilities2.getTreePath(e, getModel());
	Object[] children = e.getChildren();

	if(children == null)
	return;

	TreePath rPath;
	Vector<TreePath> toRemove
	= new Vector<TreePath>(Math.max(1, children.length));

	for(int counter = children.length - 1; counter >= 0; counter--) {
	rPath = parent.pathByAddingChild(children[counter]);
	if(expandedState.get(rPath) != null)
	toRemove.addElement(rPath);
	}
	if(toRemove.size() > 0)
	removeDescendantToggledPaths(toRemove.elements());

	TreeModel model = getModel();

	if(model == null \|\| model.isLeaf(parent.getLastPathComponent()))
	expandedState.remove(parent);

	removeDescendantSelectedPaths(e);
	}
	}


	/**
	* <code>DynamicUtilTreeNode</code> can wrap
	* vectors/hashtables/arrays/strings and
	* create the appropriate children tree nodes as necessary. It is
	* dynamic in that it will only create the children as necessary.
	* <p>
	* <strong>Warning:</strong>
	* Serialized objects of this class will not be compatible with
	* future Swing releases. The current serialization support is
	* appropriate for short term storage or RMI between applications running
	* the same version of Swing. As of 1.4, support for long term storage
	* of all JavaBeans™
	* has been added to the <code>java.beans</code> package.
	* Please see {@link java.beans.XMLEncoder}.
	*/
	@SuppressWarnings("serial")
	public static class DynamicUtilTreeNode extends DefaultMutableTreeNode {
	/**
	* Does the this <code>JTree</code> have children?
	* This property is currently not implemented.
	*/
	protected boolean hasChildren;
	/** Value to create children with. */
	protected Object childValue;
	/** Have the children been loaded yet? */
	protected boolean loadedChildren;

	/**
	* Adds to parent all the children in <code>children</code>.
	* If <code>children</code> is an array or vector all of its
	* elements are added is children, otherwise if <code>children</code>
	* is a hashtable all the key/value pairs are added in the order
	* <code>Enumeration</code> returns them.
	*/
	public static void createChildren(DefaultMutableTreeNode parent,
	Object children) {
	if(children instanceof Vector) {
	Vector<?> childVector = (Vector)children;

	for(int counter = 0, maxCounter = childVector.size();
	counter < maxCounter; counter++)
	parent.add(new DynamicUtilTreeNode
	(childVector.elementAt(counter),
	childVector.elementAt(counter)));
	}
	else if(children instanceof Hashtable) {
	Hashtable<?,?> childHT = (Hashtable)children;
	Enumeration<?> keys = childHT.keys();
	Object aKey;

	while(keys.hasMoreElements()) {
	aKey = keys.nextElement();
	parent.add(new DynamicUtilTreeNode(aKey,
	childHT.get(aKey)));
	}
	}
	else if(children instanceof Object[]) {
	Object[] childArray = (Object[])children;

	for(int counter = 0, maxCounter = childArray.length;
	counter < maxCounter; counter++)
	parent.add(new DynamicUtilTreeNode(childArray[counter],
	childArray[counter]));
	}
	}

	/**
	* Creates a node with the specified object as its value and
	* with the specified children. For the node to allow children,
	* the children-object must be an array of objects, a
	* <code>Vector</code>, or a <code>Hashtable</code> -- even
	* if empty. Otherwise, the node is not
	* allowed to have children.
	*
	* @param value the <code>Object</code> that is the value for the
	* new node
	* @param children an array of <code>Object</code>s, a
	* <code>Vector</code>, or a <code>Hashtable</code>
	* used to create the child nodes; if any other
	* object is specified, or if the value is
	* <code>null</code>,
	* then the node is not allowed to have children
	*/
	public DynamicUtilTreeNode(Object value, Object children) {
	super(value);
	loadedChildren = false;
	childValue = children;
	if(children != null) {
	if(children instanceof Vector)
	setAllowsChildren(true);
	else if(children instanceof Hashtable)
	setAllowsChildren(true);
	else if(children instanceof Object[])
	setAllowsChildren(true);
	else
	setAllowsChildren(false);
	}
	else
	setAllowsChildren(false);
	}

	/**
	* Returns true if this node allows children. Whether the node
	* allows children depends on how it was created.
	*
	* @return true if this node allows children, false otherwise
	* @see JTree.DynamicUtilTreeNode
	*/
	public boolean isLeaf() {
	return !getAllowsChildren();
	}

	/**
	* Returns the number of child nodes.
	*
	* @return the number of child nodes
	*/
	public int getChildCount() {
	if(!loadedChildren)
	loadChildren();
	return super.getChildCount();
	}

	/**
	* Loads the children based on <code>childValue</code>.
	* If <code>childValue</code> is a <code>Vector</code>
	* or array each element is added as a child,
	* if <code>childValue</code> is a <code>Hashtable</code>
	* each key/value pair is added in the order that
	* <code>Enumeration</code> returns the keys.
	*/
	protected void loadChildren() {
	loadedChildren = true;
	createChildren(this, childValue);
	}

	/**
	* Subclassed to load the children, if necessary.
	*/
	public TreeNode getChildAt(int index) {
	if(!loadedChildren)
	loadChildren();
	return super.getChildAt(index);
	}

	/**
	* Subclassed to load the children, if necessary.
	*/
	public Enumeration children() {
	if(!loadedChildren)
	loadChildren();
	return super.children();
	}
	}

	void setUIProperty(String propertyName, Object value) {
	if (propertyName == "rowHeight") {
	if (!rowHeightSet) {
	setRowHeight(((Number)value).intValue());
	rowHeightSet = false;
	}
	} else if (propertyName == "scrollsOnExpand") {
	if (!scrollsOnExpandSet) {
	setScrollsOnExpand(((Boolean)value).booleanValue());
	scrollsOnExpandSet = false;
	}
	} else if (propertyName == "showsRootHandles") {
	if (!showsRootHandlesSet) {
	setShowsRootHandles(((Boolean)value).booleanValue());
	showsRootHandlesSet = false;
	}
	} else {
	super.setUIProperty(propertyName, value);
	}
	}


	/**
	* Returns a string representation of this <code>JTree</code>.
	* This method
	* is intended to be used only for debugging purposes, and the
	* content and format of the returned string may vary between
	* implementations. The returned string may be empty but may not
	* be <code>null</code>.
	*
	* @return a string representation of this <code>JTree</code>.
	*/
	protected String paramString() {
	String rootVisibleString = (rootVisible ?
	"true" : "false");
	String showsRootHandlesString = (showsRootHandles ?
	"true" : "false");
	String editableString = (editable ?
	"true" : "false");
	String largeModelString = (largeModel ?
	"true" : "false");
	String invokesStopCellEditingString = (invokesStopCellEditing ?
	"true" : "false");
	String scrollsOnExpandString = (scrollsOnExpand ?
	"true" : "false");

	return super.paramString() +
	",editable=" + editableString +
	",invokesStopCellEditing=" + invokesStopCellEditingString +
	",largeModel=" + largeModelString +
	",rootVisible=" + rootVisibleString +
	",rowHeight=" + rowHeight +
	",scrollsOnExpand=" + scrollsOnExpandString +
	",showsRootHandles=" + showsRootHandlesString +
	",toggleClickCount=" + toggleClickCount +
	",visibleRowCount=" + visibleRowCount;
	}

	/////////////////
	// Accessibility support
	////////////////

	/**
	* Gets the AccessibleContext associated with this JTree.
	* For JTrees, the AccessibleContext takes the form of an
	* AccessibleJTree.
	* A new AccessibleJTree instance is created if necessary.
	*
	* @return an AccessibleJTree that serves as the
	* AccessibleContext of this JTree
	*/
	public AccessibleContext getAccessibleContext() {
	if (accessibleContext == null) {
	accessibleContext = new AccessibleJTree();
	}
	return accessibleContext;
	}

	/**
	* This class implements accessibility support for the
	* <code>JTree</code> class. It provides an implementation of the
	* Java Accessibility API appropriate to tree user-interface elements.
	* <p>
	* <strong>Warning:</strong>
	* Serialized objects of this class will not be compatible with
	* future Swing releases. The current serialization support is
	* appropriate for short term storage or RMI between applications running
	* the same version of Swing. As of 1.4, support for long term storage
	* of all JavaBeans™
	* has been added to the <code>java.beans</code> package.
	* Please see {@link java.beans.XMLEncoder}.
	*/
	@SuppressWarnings("serial")
	protected class AccessibleJTree extends AccessibleJComponent
	implements AccessibleSelection, TreeSelectionListener,
	TreeModelListener, TreeExpansionListener {

	TreePath leadSelectionPath;
	Accessible leadSelectionAccessible;

	public AccessibleJTree() {
	// Add a tree model listener for JTree
	TreeModel model = JTree.this.getModel();
	if (model != null) {
	model.addTreeModelListener(this);
	}
	JTree.this.addTreeExpansionListener(this);
	JTree.this.addTreeSelectionListener(this);
	leadSelectionPath = JTree.this.getLeadSelectionPath();
	leadSelectionAccessible = (leadSelectionPath != null)
	? new AccessibleJTreeNode(JTree.this,
	leadSelectionPath,
	JTree.this)
	: null;
	}

	/**
	* Tree Selection Listener value change method. Used to fire the
	* property change
	*
	* @param e ListSelectionEvent
	*
	*/
	public void valueChanged(TreeSelectionEvent e) {
	firePropertyChange(AccessibleContext.ACCESSIBLE_SELECTION_PROPERTY,
	Boolean.valueOf(false), Boolean.valueOf(true));
	}

	/**
	* Fire a visible data property change notification.
	* A 'visible' data property is one that represents
	* something about the way the component appears on the
	* display, where that appearance isn't bound to any other
	* property. It notifies screen readers that the visual
	* appearance of the component has changed, so they can
	* notify the user.
	*/
	public void fireVisibleDataPropertyChange() {
	firePropertyChange(AccessibleContext.ACCESSIBLE_VISIBLE_DATA_PROPERTY,
	Boolean.valueOf(false), Boolean.valueOf(true));
	}

	// Fire the visible data changes for the model changes.

	/**
	* Tree Model Node change notification.
	*
	* @param e a Tree Model event
	*/
	public void treeNodesChanged(TreeModelEvent e) {
	fireVisibleDataPropertyChange();
	}

	/**
	* Tree Model Node change notification.
	*
	* @param e a Tree node insertion event
	*/
	public void treeNodesInserted(TreeModelEvent e) {
	fireVisibleDataPropertyChange();
	}

	/**
	* Tree Model Node change notification.
	*
	* @param e a Tree node(s) removal event
	*/
	public void treeNodesRemoved(TreeModelEvent e) {
	fireVisibleDataPropertyChange();
	}

	/**
	* Tree Model structure change change notification.
	*
	* @param e a Tree Model event
	*/
	public void treeStructureChanged(TreeModelEvent e) {
	fireVisibleDataPropertyChange();
	}

	/**
	* Tree Collapsed notification.
	*
	* @param e a TreeExpansionEvent
	*/
	public void treeCollapsed(TreeExpansionEvent e) {
	fireVisibleDataPropertyChange();
	TreePath path = e.getPath();
	if (path != null) {
	// Set parent to null so AccessibleJTreeNode computes
	// its parent.
	AccessibleJTreeNode node = new AccessibleJTreeNode(JTree.this,
	path,
	null);
	PropertyChangeEvent pce = new PropertyChangeEvent(node,
	AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
	AccessibleState.EXPANDED,
	AccessibleState.COLLAPSED);
	firePropertyChange(AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
	null, pce);
	}
	}

	/**
	* Tree Model Expansion notification.
	*
	* @param e a Tree node insertion event
	*/
	public void treeExpanded(TreeExpansionEvent e) {
	fireVisibleDataPropertyChange();
	TreePath path = e.getPath();
	if (path != null) {
	// TIGER - 4839971
	// Set parent to null so AccessibleJTreeNode computes
	// its parent.
	AccessibleJTreeNode node = new AccessibleJTreeNode(JTree.this,
	path,
	null);
	PropertyChangeEvent pce = new PropertyChangeEvent(node,
	AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
	AccessibleState.COLLAPSED,
	AccessibleState.EXPANDED);
	firePropertyChange(AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
	null, pce);
	}
	}

	/**
	* Fire an active descendant property change notification.
	* The active descendant is used for objects such as list,
	* tree, and table, which may have transient children.
	* It notifies screen readers the active child of the component
	* has been changed so user can be notified from there.
	*
	* @param oldPath - lead path of previous active child
	* @param newPath - lead path of current active child
	*
	*/
	void fireActiveDescendantPropertyChange(TreePath oldPath, TreePath newPath){
	if(oldPath != newPath){
	Accessible oldLSA = (oldPath != null)
	? new AccessibleJTreeNode(JTree.this,
	oldPath,
	null)
	: null;

	Accessible newLSA = (newPath != null)
	? new AccessibleJTreeNode(JTree.this,
	newPath,
	null)
	: null;
	firePropertyChange(AccessibleContext.ACCESSIBLE_ACTIVE_DESCENDANT_PROPERTY,
	oldLSA, newLSA);
	}
	}

	private AccessibleContext getCurrentAccessibleContext() {
	Component c = getCurrentComponent();
	if (c instanceof Accessible) {
	return c.getAccessibleContext();
	} else {
	return null;
	}
	}

	private Component getCurrentComponent() {
	// is the object visible?
	// if so, get row, selected, focus & leaf state,
	// and then get the renderer component and return it
	TreeModel model = JTree.this.getModel();
	if (model == null) {
	return null;
	}
	Object treeRoot = model.getRoot();
	if (treeRoot == null)
	return null;

	TreePath path = new TreePath(treeRoot);
	if (JTree.this.isVisible(path)) {
	TreeCellRenderer r = JTree.this.getCellRenderer();
	TreeUI ui = JTree.this.getUI();
	if (ui != null) {
	int row = ui.getRowForPath(JTree.this, path);
	int lsr = JTree.this.getLeadSelectionRow();
	boolean hasFocus = JTree.this.isFocusOwner()
	&& (lsr == row);
	boolean selected = JTree.this.isPathSelected(path);
	boolean expanded = JTree.this.isExpanded(path);

	return r.getTreeCellRendererComponent(JTree.this,
	treeRoot, selected, expanded,
	model.isLeaf(treeRoot), row, hasFocus);
	}
	}
	return null;
	}

	// Overridden methods from AccessibleJComponent

	/**
	* Get the role of this object.
	*
	* @return an instance of AccessibleRole describing the role of the
	* object
	* @see AccessibleRole
	*/
	public AccessibleRole getAccessibleRole() {
	return AccessibleRole.TREE;
	}

	/**
	* Returns the <code>Accessible</code> child, if one exists,
	* contained at the local coordinate <code>Point</code>.
	* Otherwise returns <code>null</code>.
	*
	* @param p point in local coordinates of this <code>Accessible</code>
	* @return the <code>Accessible</code>, if it exists,
	* at the specified location; else <code>null</code>
	*/
	public Accessible getAccessibleAt(Point p) {
	TreePath path = getClosestPathForLocation(p.x, p.y);
	if (path != null) {
	// JTree.this is NOT the parent; parent will get computed later
	return new AccessibleJTreeNode(JTree.this, path, null);
	} else {
	return null;
	}
	}

	/**
	* Returns the number of top-level children nodes of this
	* JTree. Each of these nodes may in turn have children nodes.
	*
	* @return the number of accessible children nodes in the tree.
	*/
	public int getAccessibleChildrenCount() {
	TreeModel model = JTree.this.getModel();
	if (model == null) {
	return 0;
	}
	if (isRootVisible()) {
	return 1; // the root node
	}

	Object treeRoot = model.getRoot();
	if (treeRoot == null)
	return 0;
	// return the root's first set of children count
	return model.getChildCount(treeRoot);
	}

	/**
	* Return the nth Accessible child of the object.
	*
	* @param i zero-based index of child
	* @return the nth Accessible child of the object
	*/
	public Accessible getAccessibleChild(int i) {
	TreeModel model = JTree.this.getModel();
	if (model == null) {
	return null;
	}

	Object treeRoot = model.getRoot();
	if (treeRoot == null) {
	return null;
	}

	if (isRootVisible()) {
	if (i == 0) { // return the root node Accessible
	Object[] objPath = { treeRoot };
	if (objPath[0] == null)
	return null;
	TreePath path = new TreePath(objPath);
	return new AccessibleJTreeNode(JTree.this, path, JTree.this);
	} else {
	return null;
	}
	}

	// return Accessible for one of root's child nodes
	int count = model.getChildCount(treeRoot);
	if (i < 0 \|\| i >= count) {
	return null;
	}
	Object obj = model.getChild(treeRoot, i);
	if (obj == null)
	return null;
	Object[] objPath = { treeRoot, obj };
	TreePath path = new TreePath(objPath);
	return new AccessibleJTreeNode(JTree.this, path, JTree.this);
	}

	/**
	* Get the index of this object in its accessible parent.
	*
	* @return the index of this object in its parent. Since a JTree
	* top-level object does not have an accessible parent.
	* @see #getAccessibleParent
	*/
	public int getAccessibleIndexInParent() {
	// didn't ever need to override this...
	return super.getAccessibleIndexInParent();
	}

	// AccessibleSelection methods
	/**
	* Get the AccessibleSelection associated with this object. In the
	* implementation of the Java Accessibility API for this class,
	* return this object, which is responsible for implementing the
	* AccessibleSelection interface on behalf of itself.
	*
	* @return this object
	*/
	public AccessibleSelection getAccessibleSelection() {
	return this;
	}

	/**
	* Returns the number of items currently selected.
	* If no items are selected, the return value will be 0.
	*
	* @return the number of items currently selected.
	*/
	public int getAccessibleSelectionCount() {
	Object[] rootPath = new Object[1];
	rootPath[0] = treeModel.getRoot();
	if (rootPath[0] == null)
	return 0;

	TreePath childPath = new TreePath(rootPath);
	if (JTree.this.isPathSelected(childPath)) {
	return 1;
	} else {
	return 0;
	}
	}

	/**
	* Returns an Accessible representing the specified selected item
	* in the object. If there isn't a selection, or there are
	* fewer items selected than the integer passed in, the return
	* value will be null.
	*
	* @param i the zero-based index of selected items
	* @return an Accessible containing the selected item
	*/
	public Accessible getAccessibleSelection(int i) {
	// The JTree can have only one accessible child, the root.
	if (i == 0) {
	Object[] rootPath = new Object[1];
	rootPath[0] = treeModel.getRoot();
	if (rootPath[0] == null)
	return null;
	TreePath childPath = new TreePath(rootPath);
	if (JTree.this.isPathSelected(childPath)) {
	return new AccessibleJTreeNode(JTree.this, childPath, JTree.this);
	}
	}
	return null;
	}

	/**
	* Returns true if the current child of this object is selected.
	*
	* @param i the zero-based index of the child in this Accessible object.
	* @see AccessibleContext#getAccessibleChild
	*/
	public boolean isAccessibleChildSelected(int i) {
	// The JTree can have only one accessible child, the root.
	if (i == 0) {
	Object[] rootPath = new Object[1];
	rootPath[0] = treeModel.getRoot();
	if (rootPath[0] == null)
	return false;
	TreePath childPath = new TreePath(rootPath);
	return JTree.this.isPathSelected(childPath);
	} else {
	return false;
	}
	}

	/**
	* Adds the specified selected item in the object to the object's
	* selection. If the object supports multiple selections,
	* the specified item is added to any existing selection, otherwise
	* it replaces any existing selection in the object. If the
	* specified item is already selected, this method has no effect.
	*
	* @param i the zero-based index of selectable items
	*/
	public void addAccessibleSelection(int i) {
	TreeModel model = JTree.this.getModel();
	if (model != null) {
	if (i == 0) {
	Object[] objPath = {model.getRoot()};
	if (objPath[0] == null)
	return;
	TreePath path = new TreePath(objPath);
	JTree.this.addSelectionPath(path);
	}
	}
	}

	/**
	* Removes the specified selected item in the object from the object's
	* selection. If the specified item isn't currently selected, this
	* method has no effect.
	*
	* @param i the zero-based index of selectable items
	*/
	public void removeAccessibleSelection(int i) {
	TreeModel model = JTree.this.getModel();
	if (model != null) {
	if (i == 0) {
	Object[] objPath = {model.getRoot()};
	if (objPath[0] == null)
	return;
	TreePath path = new TreePath(objPath);
	JTree.this.removeSelectionPath(path);
	}
	}
	}

	/**
	* Clears the selection in the object, so that nothing in the
	* object is selected.
	*/
	public void clearAccessibleSelection() {
	int childCount = getAccessibleChildrenCount();
	for (int i = 0; i < childCount; i++) {
	removeAccessibleSelection(i);
	}
	}

	/**
	* Causes every selected item in the object to be selected
	* if the object supports multiple selections.
	*/
	public void selectAllAccessibleSelection() {
	TreeModel model = JTree.this.getModel();
	if (model != null) {
	Object[] objPath = {model.getRoot()};
	if (objPath[0] == null)
	return;
	TreePath path = new TreePath(objPath);
	JTree.this.addSelectionPath(path);
	}
	}

	/**
	* This class implements accessibility support for the
	* <code>JTree</code> child. It provides an implementation of the
	* Java Accessibility API appropriate to tree nodes.
	*/
	protected class AccessibleJTreeNode extends AccessibleContext
	implements Accessible, AccessibleComponent, AccessibleSelection,
	AccessibleAction {

	private JTree tree = null;
	private TreeModel treeModel = null;
	private Object obj = null;
	private TreePath path = null;
	private Accessible accessibleParent = null;
	private int index = 0;
	private boolean isLeaf = false;

	/**
	* Constructs an AccessibleJTreeNode
	* @since 1.4
	*/
	public AccessibleJTreeNode(JTree t, TreePath p, Accessible ap) {
	tree = t;
	path = p;
	accessibleParent = ap;
	treeModel = t.getModel();
	obj = p.getLastPathComponent();
	if (treeModel != null) {
	isLeaf = treeModel.isLeaf(obj);
	}
	}

	private TreePath getChildTreePath(int i) {
	// Tree nodes can't be so complex that they have
	// two sets of children -> we're ignoring that case
	if (i < 0 \|\| i >= getAccessibleChildrenCount()) {
	return null;
	} else {
	Object childObj = treeModel.getChild(obj, i);
	Object[] objPath = path.getPath();
	Object[] objChildPath = new Object[objPath.length+1];
	java.lang.System.arraycopy(objPath, 0, objChildPath, 0, objPath.length);
	objChildPath[objChildPath.length-1] = childObj;
	return new TreePath(objChildPath);
	}
	}

	/**
	* Get the AccessibleContext associated with this tree node.
	* In the implementation of the Java Accessibility API for
	* this class, return this object, which is its own
	* AccessibleContext.
	*
	* @return this object
	*/
	public AccessibleContext getAccessibleContext() {
	return this;
	}

	private AccessibleContext getCurrentAccessibleContext() {
	Component c = getCurrentComponent();
	if (c instanceof Accessible) {
	return c.getAccessibleContext();
	} else {
	return null;
	}
	}

	private Component getCurrentComponent() {
	// is the object visible?
	// if so, get row, selected, focus & leaf state,
	// and then get the renderer component and return it
	if (tree.isVisible(path)) {
	TreeCellRenderer r = tree.getCellRenderer();
	if (r == null) {
	return null;
	}
	TreeUI ui = tree.getUI();
	if (ui != null) {
	int row = ui.getRowForPath(JTree.this, path);
	boolean selected = tree.isPathSelected(path);
	boolean expanded = tree.isExpanded(path);
	boolean hasFocus = false; // how to tell?? -PK
	return r.getTreeCellRendererComponent(tree, obj,
	selected, expanded, isLeaf, row, hasFocus);
	}
	}
	return null;
	}

	// AccessibleContext methods

	/**
	* Get the accessible name of this object.
	*
	* @return the localized name of the object; null if this
	* object does not have a name
	*/
	public String getAccessibleName() {
	AccessibleContext ac = getCurrentAccessibleContext();
	if (ac != null) {
	String name = ac.getAccessibleName();
	if ((name != null) && (name != "")) {
	return ac.getAccessibleName();
	} else {
	return null;
	}
	}
	if ((accessibleName != null) && (accessibleName != "")) {
	return accessibleName;
	} else {
	// fall back to the client property
	return (String)getClientProperty(AccessibleContext.ACCESSIBLE_NAME_PROPERTY);
	}
	}

	/**
	* Set the localized accessible name of this object.
	*
	* @param s the new localized name of the object.
	*/
	public void setAccessibleName(String s) {
	AccessibleContext ac = getCurrentAccessibleContext();
	if (ac != null) {
	ac.setAccessibleName(s);
	} else {
	super.setAccessibleName(s);
	}
	}

	//
	// *** should check tooltip text for desc. (needs MouseEvent)
	//
	/**
	* Get the accessible description of this object.
	*
	* @return the localized description of the object; null if
	* this object does not have a description
	*/
	public String getAccessibleDescription() {
	AccessibleContext ac = getCurrentAccessibleContext();
	if (ac != null) {
	return ac.getAccessibleDescription();
	} else {
	return super.getAccessibleDescription();
	}
	}

	/**
	* Set the accessible description of this object.
	*
	* @param s the new localized description of the object
	*/
	public void setAccessibleDescription(String s) {
	AccessibleContext ac = getCurrentAccessibleContext();
	if (ac != null) {
	ac.setAccessibleDescription(s);
	} else {
	super.setAccessibleDescription(s);
	}
	}

	/**
	* Get the role of this object.
	*
	* @return an instance of AccessibleRole describing the role of the object
	* @see AccessibleRole
	*/
	public AccessibleRole getAccessibleRole() {
	AccessibleContext ac = getCurrentAccessibleContext();
	if (ac != null) {
	return ac.getAccessibleRole();
	} else {
	return AccessibleRole.UNKNOWN;
	}
	}

	/**
	* Get the state set of this object.
	*
	* @return an instance of AccessibleStateSet containing the
	* current state set of the object
	* @see AccessibleState
	*/
	public AccessibleStateSet getAccessibleStateSet() {
	AccessibleContext ac = getCurrentAccessibleContext();
	AccessibleStateSet states;
	if (ac != null) {
	states = ac.getAccessibleStateSet();
	} else {
	states = new AccessibleStateSet();
	}
	// need to test here, 'cause the underlying component
	// is a cellRenderer, which is never showing...
	if (isShowing()) {
	states.add(AccessibleState.SHOWING);
	} else if (states.contains(AccessibleState.SHOWING)) {
	states.remove(AccessibleState.SHOWING);
	}
	if (isVisible()) {
	states.add(AccessibleState.VISIBLE);
	} else if (states.contains(AccessibleState.VISIBLE)) {
	states.remove(AccessibleState.VISIBLE);
	}
	if (tree.isPathSelected(path)){
	states.add(AccessibleState.SELECTED);
	}
	if (path == getLeadSelectionPath()) {
	states.add(AccessibleState.ACTIVE);
	}
	if (!isLeaf) {
	states.add(AccessibleState.EXPANDABLE);
	}
	if (tree.isExpanded(path)) {
	states.add(AccessibleState.EXPANDED);
	} else {
	states.add(AccessibleState.COLLAPSED);
	}
	if (tree.isEditable()) {
	states.add(AccessibleState.EDITABLE);
	}
	return states;
	}

	/**
	* Get the Accessible parent of this object.
	*
	* @return the Accessible parent of this object; null if this
	* object does not have an Accessible parent
	*/
	public Accessible getAccessibleParent() {
	// someone wants to know, so we need to create our parent
	// if we don't have one (hey, we're a talented kid!)
	if (accessibleParent == null) {
	Object[] objPath = path.getPath();
	if (objPath.length > 1) {
	Object objParent = objPath[objPath.length-2];
	if (treeModel != null) {
	index = treeModel.getIndexOfChild(objParent, obj);
	}
	Object[] objParentPath = new Object[objPath.length-1];
	java.lang.System.arraycopy(objPath, 0, objParentPath,
	0, objPath.length-1);
	TreePath parentPath = new TreePath(objParentPath);
	accessibleParent = new AccessibleJTreeNode(tree,
	parentPath,
	null);
	this.setAccessibleParent(accessibleParent);
	} else if (treeModel != null) {
	accessibleParent = tree; // we're the top!
	index = 0; // we're an only child!
	this.setAccessibleParent(accessibleParent);
	}
	}
	return accessibleParent;
	}

	/**
	* Get the index of this object in its accessible parent.
	*
	* @return the index of this object in its parent; -1 if this
	* object does not have an accessible parent.
	* @see #getAccessibleParent
	*/
	public int getAccessibleIndexInParent() {
	// index is invalid 'till we have an accessibleParent...
	if (accessibleParent == null) {
	getAccessibleParent();
	}
	Object[] objPath = path.getPath();
	if (objPath.length > 1) {
	Object objParent = objPath[objPath.length-2];
	if (treeModel != null) {
	index = treeModel.getIndexOfChild(objParent, obj);
	}
	}
	return index;
	}

	/**
	* Returns the number of accessible children in the object.
	*
	* @return the number of accessible children in the object.
	*/
	public int getAccessibleChildrenCount() {
	// Tree nodes can't be so complex that they have
	// two sets of children -> we're ignoring that case
	return treeModel.getChildCount(obj);
	}

	/**
	* Return the specified Accessible child of the object.
	*
	* @param i zero-based index of child
	* @return the Accessible child of the object
	*/
	public Accessible getAccessibleChild(int i) {
	// Tree nodes can't be so complex that they have
	// two sets of children -> we're ignoring that case
	if (i < 0 \|\| i >= getAccessibleChildrenCount()) {
	return null;
	} else {
	Object childObj = treeModel.getChild(obj, i);
	Object[] objPath = path.getPath();
	Object[] objChildPath = new Object[objPath.length+1];
	java.lang.System.arraycopy(objPath, 0, objChildPath, 0, objPath.length);
	objChildPath[objChildPath.length-1] = childObj;
	TreePath childPath = new TreePath(objChildPath);
	return new AccessibleJTreeNode(JTree.this, childPath, this);
	}
	}

	/**
	* Gets the locale of the component. If the component does not have
	* a locale, then the locale of its parent is returned.
	*
	* @return This component's locale. If this component does not have
	* a locale, the locale of its parent is returned.
	* @exception IllegalComponentStateException
	* If the Component does not have its own locale and has not yet
	* been added to a containment hierarchy such that the locale can be
	* determined from the containing parent.
	* @see #setLocale
	*/
	public Locale getLocale() {
	AccessibleContext ac = getCurrentAccessibleContext();
	if (ac != null) {
	return ac.getLocale();
	} else {
	return tree.getLocale();
	}
	}

	/**
	* Add a PropertyChangeListener to the listener list.
	* The listener is registered for all properties.
	*
	* @param l The PropertyChangeListener to be added
	*/
	public void addPropertyChangeListener(PropertyChangeListener l) {
	AccessibleContext ac = getCurrentAccessibleContext();
	if (ac != null) {
	ac.addPropertyChangeListener(l);
	} else {
	super.addPropertyChangeListener(l);
	}
	}

	/**
	* Remove a PropertyChangeListener from the listener list.
	* This removes a PropertyChangeListener that was registered
	* for all properties.
	*
	* @param l The PropertyChangeListener to be removed
	*/
	public void removePropertyChangeListener(PropertyChangeListener l) {
	AccessibleContext ac = getCurrentAccessibleContext();
	if (ac != null) {
	ac.removePropertyChangeListener(l);
	} else {
	super.removePropertyChangeListener(l);
	}
	}

	/**
	* Get the AccessibleAction associated with this object. In the
	* implementation of the Java Accessibility API for this class,
	* return this object, which is responsible for implementing the
	* AccessibleAction interface on behalf of itself.
	*
	* @return this object
	*/
	public AccessibleAction getAccessibleAction() {
	return this;
	}

	/**
	* Get the AccessibleComponent associated with this object. In the
	* implementation of the Java Accessibility API for this class,
	* return this object, which is responsible for implementing the
	* AccessibleComponent interface on behalf of itself.
	*
	* @return this object
	*/
	public AccessibleComponent getAccessibleComponent() {
	return this; // to override getBounds()
	}

	/**
	* Get the AccessibleSelection associated with this object if one
	* exists. Otherwise return null.
	*
	* @return the AccessibleSelection, or null
	*/
	public AccessibleSelection getAccessibleSelection() {
	AccessibleContext ac = getCurrentAccessibleContext();
	if (ac != null && isLeaf) {
	return getCurrentAccessibleContext().getAccessibleSelection();
	} else {
	return this;
	}
	}

	/**
	* Get the AccessibleText associated with this object if one
	* exists. Otherwise return null.
	*
	* @return the AccessibleText, or null
	*/
	public AccessibleText getAccessibleText() {
	AccessibleContext ac = getCurrentAccessibleContext();
	if (ac != null) {
	return getCurrentAccessibleContext().getAccessibleText();
	} else {
	return null;
	}
	}

	/**
	* Get the AccessibleValue associated with this object if one
	* exists. Otherwise return null.
	*
	* @return the AccessibleValue, or null
	*/
	public AccessibleValue getAccessibleValue() {
	AccessibleContext ac = getCurrentAccessibleContext();
	if (ac != null) {
	return getCurrentAccessibleContext().getAccessibleValue();
	} else {
	return null;
	}
	}


	// AccessibleComponent methods

	/**
	* Get the background color of this object.
	*
	* @return the background color, if supported, of the object;
	* otherwise, null
	*/
	public Color getBackground() {
	AccessibleContext ac = getCurrentAccessibleContext();
	if (ac instanceof AccessibleComponent) {
	return ((AccessibleComponent) ac).getBackground();
	} else {
	Component c = getCurrentComponent();
	if (c != null) {
	return c.getBackground();
	} else {
	return null;
	}
	}
	}

	/**
	* Set the background color of this object.
	*
	* @param c the new Color for the background
	*/
	public void setBackground(Color c) {
	AccessibleContext ac = getCurrentAccessibleContext();
	if (ac instanceof AccessibleComponent) {
	((AccessibleComponent) ac).setBackground(c);
	} else {
	Component cp = getCurrentComponent();
	if (cp != null) {
	cp.setBackground(c);
	}
	}
	}


	/**
	* Get the foreground color of this object.
	*
	* @return the foreground color, if supported, of the object;
	* otherwise, null
	*/
	public Color getForeground() {
	AccessibleContext ac = getCurrentAccessibleContext();
	if (ac instanceof AccessibleComponent) {
	return ((AccessibleComponent) ac).getForeground();
	} else {
	Component c = getCurrentComponent();
	if (c != null) {
	return c.getForeground();
	} else {
	return null;
	}
	}
	}

	public void setForeground(Color c) {
	AccessibleContext ac = getCurrentAccessibleContext();
	if (ac instanceof AccessibleComponent) {
	((AccessibleComponent) ac).setForeground(c);
	} else {
	Component cp = getCurrentComponent();
	if (cp != null) {
	cp.setForeground(c);
	}
	}
	}

	public Cursor getCursor() {
	AccessibleContext ac = getCurrentAccessibleContext();
	if (ac instanceof AccessibleComponent) {
	return ((AccessibleComponent) ac).getCursor();
	} else {
	Component c = getCurrentComponent();
	if (c != null) {
	return c.getCursor();
	} else {
	Accessible ap = getAccessibleParent();
	if (ap instanceof AccessibleComponent) {
	return ((AccessibleComponent) ap).getCursor();
	} else {
	return null;
	}
	}
	}
	}

	public void setCursor(Cursor c) {
	AccessibleContext ac = getCurrentAccessibleContext();
	if (ac instanceof AccessibleComponent) {
	((AccessibleComponent) ac).setCursor(c);
	} else {
	Component cp = getCurrentComponent();
	if (cp != null) {
	cp.setCursor(c);
	}
	}
	}

	public Font getFont() {
	AccessibleContext ac = getCurrentAccessibleContext();
	if (ac instanceof AccessibleComponent) {
	return ((AccessibleComponent) ac).getFont();
	} else {
	Component c = getCurrentComponent();
	if (c != null) {
	return c.getFont();
	} else {
	return null;
	}
	}
	}

	public void setFont(Font f) {
	AccessibleContext ac = getCurrentAccessibleContext();
	if (ac instanceof AccessibleComponent) {
	((AccessibleComponent) ac).setFont(f);
	} else {
	Component c = getCurrentComponent();
	if (c != null) {
	c.setFont(f);
	}
	}
	}

	public FontMetrics getFontMetrics(Font f) {
	AccessibleContext ac = getCurrentAccessibleContext();
	if (ac instanceof AccessibleComponent) {
	return ((AccessibleComponent) ac).getFontMetrics(f);
	} else {
	Component c = getCurrentComponent();
	if (c != null) {
	return c.getFontMetrics(f);
	} else {
	return null;
	}
	}
	}

	public boolean isEnabled() {
	AccessibleContext ac = getCurrentAccessibleContext();
	if (ac instanceof AccessibleComponent) {
	return ((AccessibleComponent) ac).isEnabled();
	} else {
	Component c = getCurrentComponent();
	if (c != null) {
	return c.isEnabled();
	} else {
	return false;
	}
	}
	}

	public void setEnabled(boolean b) {
	AccessibleContext ac = getCurrentAccessibleContext();
	if (ac instanceof AccessibleComponent) {
	((AccessibleComponent) ac).setEnabled(b);
	} else {
	Component c = getCurrentComponent();
	if (c != null) {
	c.setEnabled(b);
	}
	}
	}

	public boolean isVisible() {
	Rectangle pathBounds = tree.getPathBounds(path);
	Rectangle parentBounds = tree.getVisibleRect();
	return pathBounds != null && parentBounds != null &&
	parentBounds.intersects(pathBounds);
	}

	public void setVisible(boolean b) {
	}

	public boolean isShowing() {
	return (tree.isShowing() && isVisible());
	}

	public boolean contains(Point p) {
	AccessibleContext ac = getCurrentAccessibleContext();
	if (ac instanceof AccessibleComponent) {
	Rectangle r = ((AccessibleComponent) ac).getBounds();
	return r.contains(p);
	} else {
	Component c = getCurrentComponent();
	if (c != null) {
	Rectangle r = c.getBounds();
	return r.contains(p);
	} else {
	return getBounds().contains(p);
	}
	}
	}

	public Point getLocationOnScreen() {
	if (tree != null) {
	Point treeLocation = tree.getLocationOnScreen();
	Rectangle pathBounds = tree.getPathBounds(path);
	if (treeLocation != null && pathBounds != null) {
	Point nodeLocation = new Point(pathBounds.x,
	pathBounds.y);
	nodeLocation.translate(treeLocation.x, treeLocation.y);
	return nodeLocation;
	} else {
	return null;
	}
	} else {
	return null;
	}
	}

	protected Point getLocationInJTree() {
	Rectangle r = tree.getPathBounds(path);
	if (r != null) {
	return r.getLocation();
	} else {
	return null;
	}
	}

	public Point getLocation() {
	Rectangle r = getBounds();
	if (r != null) {
	return r.getLocation();
	} else {
	return null;
	}
	}

	public void setLocation(Point p) {
	}

	public Rectangle getBounds() {
	Rectangle r = tree.getPathBounds(path);
	Accessible parent = getAccessibleParent();
	if (parent != null) {
	if (parent instanceof AccessibleJTreeNode) {
	Point parentLoc = ((AccessibleJTreeNode) parent).getLocationInJTree();
	if (parentLoc != null && r != null) {
	r.translate(-parentLoc.x, -parentLoc.y);
	} else {
	return null; // not visible!
	}
	}
	}
	return r;
	}

	public void setBounds(Rectangle r) {
	AccessibleContext ac = getCurrentAccessibleContext();
	if (ac instanceof AccessibleComponent) {
	((AccessibleComponent) ac).setBounds(r);
	} else {
	Component c = getCurrentComponent();
	if (c != null) {
	c.setBounds(r);
	}
	}
	}

	public Dimension getSize() {
	return getBounds().getSize();
	}

	public void setSize (Dimension d) {
	AccessibleContext ac = getCurrentAccessibleContext();
	if (ac instanceof AccessibleComponent) {
	((AccessibleComponent) ac).setSize(d);
	} else {
	Component c = getCurrentComponent();
	if (c != null) {
	c.setSize(d);
	}
	}
	}

	/**
	* Returns the <code>Accessible</code> child, if one exists,
	* contained at the local coordinate <code>Point</code>.
	* Otherwise returns <code>null</code>.
	*
	* @param p point in local coordinates of this
	* <code>Accessible</code>
	* @return the <code>Accessible</code>, if it exists,
	* at the specified location; else <code>null</code>
	*/
	public Accessible getAccessibleAt(Point p) {
	AccessibleContext ac = getCurrentAccessibleContext();
	if (ac instanceof AccessibleComponent) {
	return ((AccessibleComponent) ac).getAccessibleAt(p);
	} else {
	return null;
	}
	}

	@SuppressWarnings("deprecation")
	public boolean isFocusTraversable() {
	AccessibleContext ac = getCurrentAccessibleContext();
	if (ac instanceof AccessibleComponent) {
	return ((AccessibleComponent) ac).isFocusTraversable();
	} else {
	Component c = getCurrentComponent();
	if (c != null) {
	return c.isFocusTraversable();
	} else {
	return false;
	}
	}
	}

	public void requestFocus() {
	AccessibleContext ac = getCurrentAccessibleContext();
	if (ac instanceof AccessibleComponent) {
	((AccessibleComponent) ac).requestFocus();
	} else {
	Component c = getCurrentComponent();
	if (c != null) {
	c.requestFocus();
	}
	}
	}

	public void addFocusListener(FocusListener l) {
	AccessibleContext ac = getCurrentAccessibleContext();
	if (ac instanceof AccessibleComponent) {
	((AccessibleComponent) ac).addFocusListener(l);
	} else {
	Component c = getCurrentComponent();
	if (c != null) {
	c.addFocusListener(l);
	}
	}
	}

	public void removeFocusListener(FocusListener l) {
	AccessibleContext ac = getCurrentAccessibleContext();
	if (ac instanceof AccessibleComponent) {
	((AccessibleComponent) ac).removeFocusListener(l);
	} else {
	Component c = getCurrentComponent();
	if (c != null) {
	c.removeFocusListener(l);
	}
	}
	}

	// AccessibleSelection methods

	/**
	* Returns the number of items currently selected.
	* If no items are selected, the return value will be 0.
	*
	* @return the number of items currently selected.
	*/
	public int getAccessibleSelectionCount() {
	int count = 0;
	int childCount = getAccessibleChildrenCount();
	for (int i = 0; i < childCount; i++) {
	TreePath childPath = getChildTreePath(i);
	if (tree.isPathSelected(childPath)) {
	count++;
	}
	}
	return count;
	}

	/**
	* Returns an Accessible representing the specified selected item
	* in the object. If there isn't a selection, or there are
	* fewer items selected than the integer passed in, the return
	* value will be null.
	*
	* @param i the zero-based index of selected items
	* @return an Accessible containing the selected item
	*/
	public Accessible getAccessibleSelection(int i) {
	int childCount = getAccessibleChildrenCount();
	if (i < 0 \|\| i >= childCount) {
	return null; // out of range
	}
	int count = 0;
	for (int j = 0; j < childCount && i >= count; j++) {
	TreePath childPath = getChildTreePath(j);
	if (tree.isPathSelected(childPath)) {
	if (count == i) {
	return new AccessibleJTreeNode(tree, childPath, this);
	} else {
	count++;
	}
	}
	}
	return null;
	}

	/**
	* Returns true if the current child of this object is selected.
	*
	* @param i the zero-based index of the child in this Accessible
	* object.
	* @see AccessibleContext#getAccessibleChild
	*/
	public boolean isAccessibleChildSelected(int i) {
	int childCount = getAccessibleChildrenCount();
	if (i < 0 \|\| i >= childCount) {
	return false; // out of range
	} else {
	TreePath childPath = getChildTreePath(i);
	return tree.isPathSelected(childPath);
	}
	}

	/**
	* Adds the specified selected item in the object to the object's
	* selection. If the object supports multiple selections,
	* the specified item is added to any existing selection, otherwise
	* it replaces any existing selection in the object. If the
	* specified item is already selected, this method has no effect.
	*
	* @param i the zero-based index of selectable items
	*/
	public void addAccessibleSelection(int i) {
	TreeModel model = JTree.this.getModel();
	if (model != null) {
	if (i >= 0 && i < getAccessibleChildrenCount()) {
	TreePath path = getChildTreePath(i);
	JTree.this.addSelectionPath(path);
	}
	}
	}

	/**
	* Removes the specified selected item in the object from the
	* object's
	* selection. If the specified item isn't currently selected, this
	* method has no effect.
	*
	* @param i the zero-based index of selectable items
	*/
	public void removeAccessibleSelection(int i) {
	TreeModel model = JTree.this.getModel();
	if (model != null) {
	if (i >= 0 && i < getAccessibleChildrenCount()) {
	TreePath path = getChildTreePath(i);
	JTree.this.removeSelectionPath(path);
	}
	}
	}

	/**
	* Clears the selection in the object, so that nothing in the
	* object is selected.
	*/
	public void clearAccessibleSelection() {
	int childCount = getAccessibleChildrenCount();
	for (int i = 0; i < childCount; i++) {
	removeAccessibleSelection(i);
	}
	}

	/**
	* Causes every selected item in the object to be selected
	* if the object supports multiple selections.
	*/
	public void selectAllAccessibleSelection() {
	TreeModel model = JTree.this.getModel();
	if (model != null) {
	int childCount = getAccessibleChildrenCount();
	TreePath path;
	for (int i = 0; i < childCount; i++) {
	path = getChildTreePath(i);
	JTree.this.addSelectionPath(path);
	}
	}
	}

	// AccessibleAction methods

	/**
	* Returns the number of accessible actions available in this
	* tree node. If this node is not a leaf, there is at least
	* one action (toggle expand), in addition to any available
	* on the object behind the TreeCellRenderer.
	*
	* @return the number of Actions in this object
	*/
	public int getAccessibleActionCount() {
	AccessibleContext ac = getCurrentAccessibleContext();
	if (ac != null) {
	AccessibleAction aa = ac.getAccessibleAction();
	if (aa != null) {
	return (aa.getAccessibleActionCount() + (isLeaf ? 0 : 1));
	}
	}
	return isLeaf ? 0 : 1;
	}

	/**
	* Return a description of the specified action of the tree node.
	* If this node is not a leaf, there is at least one action
	* description (toggle expand), in addition to any available
	* on the object behind the TreeCellRenderer.
	*
	* @param i zero-based index of the actions
	* @return a description of the action
	*/
	public String getAccessibleActionDescription(int i) {
	if (i < 0 \|\| i >= getAccessibleActionCount()) {
	return null;
	}
	AccessibleContext ac = getCurrentAccessibleContext();
	if (i == 0) {
	// TIGER - 4766636
	return AccessibleAction.TOGGLE_EXPAND;
	} else if (ac != null) {
	AccessibleAction aa = ac.getAccessibleAction();
	if (aa != null) {
	return aa.getAccessibleActionDescription(i - 1);
	}
	}
	return null;
	}

	/**
	* Perform the specified Action on the tree node. If this node
	* is not a leaf, there is at least one action which can be
	* done (toggle expand), in addition to any available on the
	* object behind the TreeCellRenderer.
	*
	* @param i zero-based index of actions
	* @return true if the the action was performed; else false.
	*/
	public boolean doAccessibleAction(int i) {
	if (i < 0 \|\| i >= getAccessibleActionCount()) {
	return false;
	}
	AccessibleContext ac = getCurrentAccessibleContext();
	if (i == 0) {
	if (JTree.this.isExpanded(path)) {
	JTree.this.collapsePath(path);
	} else {
	JTree.this.expandPath(path);
	}
	return true;
	} else if (ac != null) {
	AccessibleAction aa = ac.getAccessibleAction();
	if (aa != null) {
	return aa.doAccessibleAction(i - 1);
	}
	}
	return false;
	}

	} // inner class AccessibleJTreeNode

	} // inner class AccessibleJTree

	} // End of class JTree

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