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	/*
	* Copyright (c) 1997, 2013, 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.table;

	import javax.swing.*;
	import javax.swing.border.*;
	import javax.swing.event.SwingPropertyChangeSupport;
	import java.lang.Integer;
	import java.awt.Color;
	import java.awt.Component;
	import java.io.Serializable;
	import java.beans.PropertyChangeEvent;
	import java.beans.PropertyChangeListener;

	/**
	* A <code>TableColumn</code> represents all the attributes of a column in a
	* <code>JTable</code>, such as width, resizability, minimum and maximum width.
	* In addition, the <code>TableColumn</code> provides slots for a renderer and
	* an editor that can be used to display and edit the values in this column.
	* <p>
	* It is also possible to specify renderers and editors on a per type basis
	* rather than a per column basis - see the
	* <code>setDefaultRenderer</code> method in the <code>JTable</code> class.
	* This default mechanism is only used when the renderer (or
	* editor) in the <code>TableColumn</code> is <code>null</code>.
	* <p>
	* The <code>TableColumn</code> stores the link between the columns in the
	* <code>JTable</code> and the columns in the <code>TableModel</code>.
	* The <code>modelIndex</code> is the column in the
	* <code>TableModel</code>, which will be queried for the data values for the
	* cells in this column. As the column moves around in the view this
	* <code>modelIndex</code> does not change.
	* <p>
	* <b>Note:</b> Some implementations may assume that all
	* <code>TableColumnModel</code>s are unique, therefore we would
	* recommend that the same <code>TableColumn</code> instance
	* not be added more than once to a <code>TableColumnModel</code>.
	* To show <code>TableColumn</code>s with the same column of
	* data from the model, create a new instance with the same
	* <code>modelIndex</code>.
	* <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}.
	*
	* @author Alan Chung
	* @author Philip Milne
	* @see javax.swing.table.TableColumnModel
	*
	* @see javax.swing.table.DefaultTableColumnModel
	* @see javax.swing.table.JTableHeader#getDefaultRenderer()
	* @see JTable#getDefaultRenderer(Class)
	* @see JTable#getDefaultEditor(Class)
	* @see JTable#getCellRenderer(int, int)
	* @see JTable#getCellEditor(int, int)
	*/
	public class TableColumn extends Object implements Serializable {

	/**
	* Obsolete as of Java 2 platform v1.3. Please use string literals to identify
	* properties.
	*/
	/*
	* Warning: The value of this constant, "columWidth" is wrong as the
	* name of the property is "columnWidth".
	*/
	public final static String COLUMN_WIDTH_PROPERTY = "columWidth";

	/**
	* Obsolete as of Java 2 platform v1.3. Please use string literals to identify
	* properties.
	*/
	public final static String HEADER_VALUE_PROPERTY = "headerValue";

	/**
	* Obsolete as of Java 2 platform v1.3. Please use string literals to identify
	* properties.
	*/
	public final static String HEADER_RENDERER_PROPERTY = "headerRenderer";

	/**
	* Obsolete as of Java 2 platform v1.3. Please use string literals to identify
	* properties.
	*/
	public final static String CELL_RENDERER_PROPERTY = "cellRenderer";

	//
	// Instance Variables
	//

	/**
	* The index of the column in the model which is to be displayed by
	* this <code>TableColumn</code>. As columns are moved around in the
	* view <code>modelIndex</code> remains constant.
	*/
	protected int modelIndex;

	/**
	* This object is not used internally by the drawing machinery of
	* the <code>JTable</code>; identifiers may be set in the
	* <code>TableColumn</code> as as an
	* optional way to tag and locate table columns. The table package does
	* not modify or invoke any methods in these identifier objects other
	* than the <code>equals</code> method which is used in the
	* <code>getColumnIndex()</code> method in the
	* <code>DefaultTableColumnModel</code>.
	*/
	protected Object identifier;

	/** The width of the column. */
	protected int width;

	/** The minimum width of the column. */
	protected int minWidth;

	/** The preferred width of the column. */
	private int preferredWidth;

	/** The maximum width of the column. */
	protected int maxWidth;

	/** The renderer used to draw the header of the column. */
	protected TableCellRenderer headerRenderer;

	/** The header value of the column. */
	protected Object headerValue;

	/** The renderer used to draw the data cells of the column. */
	protected TableCellRenderer cellRenderer;

	/** The editor used to edit the data cells of the column. */
	protected TableCellEditor cellEditor;

	/** If true, the user is allowed to resize the column; the default is true. */
	protected boolean isResizable;

	/**
	* This field was not used in previous releases and there are
	* currently no plans to support it in the future.
	*
	* @deprecated as of Java 2 platform v1.3
	*/
	/*
	* Counter used to disable posting of resizing notifications until the
	* end of the resize.
	*/
	@Deprecated
	transient protected int resizedPostingDisableCount;

	/**
	* If any <code>PropertyChangeListeners</code> have been registered, the
	* <code>changeSupport</code> field describes them.
	*/
	private SwingPropertyChangeSupport changeSupport;

	//
	// Constructors
	//

	/**
	* Cover method, using a default model index of 0,
	* default width of 75, a <code>null</code> renderer and a
	* <code>null</code> editor.
	* This method is intended for serialization.
	* @see #TableColumn(int, int, TableCellRenderer, TableCellEditor)
	*/
	public TableColumn() {
	this(0);
	}

	/**
	* Cover method, using a default width of 75, a <code>null</code>
	* renderer and a <code>null</code> editor.
	* @see #TableColumn(int, int, TableCellRenderer, TableCellEditor)
	*/
	public TableColumn(int modelIndex) {
	this(modelIndex, 75, null, null);
	}

	/**
	* Cover method, using a <code>null</code> renderer and a
	* <code>null</code> editor.
	* @see #TableColumn(int, int, TableCellRenderer, TableCellEditor)
	*/
	public TableColumn(int modelIndex, int width) {
	this(modelIndex, width, null, null);
	}

	/**
	* Creates and initializes an instance of
	* <code>TableColumn</code> with the specified model index,
	* width, cell renderer, and cell editor;
	* all <code>TableColumn</code> constructors delegate to this one.
	* The value of <code>width</code> is used
	* for both the initial and preferred width;
	* if <code>width</code> is negative,
	* they're set to 0.
	* The minimum width is set to 15 unless the initial width is less,
	* in which case the minimum width is set to
	* the initial width.
	*
	* <p>
	* When the <code>cellRenderer</code>
	* or <code>cellEditor</code> parameter is <code>null</code>,
	* a default value provided by the <code>JTable</code>
	* <code>getDefaultRenderer</code>
	* or <code>getDefaultEditor</code> method, respectively,
	* is used to
	* provide defaults based on the type of the data in this column.
	* This column-centric rendering strategy can be circumvented by overriding
	* the <code>getCellRenderer</code> methods in <code>JTable</code>.
	*
	* @param modelIndex the index of the column
	* in the model that supplies the data for this column in the table;
	* the model index remains the same
	* even when columns are reordered in the view
	* @param width this column's preferred width and initial width
	* @param cellRenderer the object used to render values in this column
	* @param cellEditor the object used to edit values in this column
	* @see #getMinWidth()
	* @see JTable#getDefaultRenderer(Class)
	* @see JTable#getDefaultEditor(Class)
	* @see JTable#getCellRenderer(int, int)
	* @see JTable#getCellEditor(int, int)
	*/
	public TableColumn(int modelIndex, int width,
	TableCellRenderer cellRenderer,
	TableCellEditor cellEditor) {
	super();
	this.modelIndex = modelIndex;
	preferredWidth = this.width = Math.max(width, 0);

	this.cellRenderer = cellRenderer;
	this.cellEditor = cellEditor;

	// Set other instance variables to default values.
	minWidth = Math.min(15, this.width);
	maxWidth = Integer.MAX_VALUE;
	isResizable = true;
	resizedPostingDisableCount = 0;
	headerValue = null;
	}

	//
	// Modifying and Querying attributes
	//

	private void firePropertyChange(String propertyName, Object oldValue, Object newValue) {
	if (changeSupport != null) {
	changeSupport.firePropertyChange(propertyName, oldValue, newValue);
	}
	}

	private void firePropertyChange(String propertyName, int oldValue, int newValue) {
	if (oldValue != newValue) {
	firePropertyChange(propertyName, Integer.valueOf(oldValue), Integer.valueOf(newValue));
	}
	}

	private void firePropertyChange(String propertyName, boolean oldValue, boolean newValue) {
	if (oldValue != newValue) {
	firePropertyChange(propertyName, Boolean.valueOf(oldValue), Boolean.valueOf(newValue));
	}
	}

	/**
	* Sets the model index for this column. The model index is the
	* index of the column in the model that will be displayed by this
	* <code>TableColumn</code>. As the <code>TableColumn</code>
	* is moved around in the view the model index remains constant.
	* @param modelIndex the new modelIndex
	* @beaninfo
	* bound: true
	* description: The model index.
	*/
	public void setModelIndex(int modelIndex) {
	int old = this.modelIndex;
	this.modelIndex = modelIndex;
	firePropertyChange("modelIndex", old, modelIndex);
	}

	/**
	* Returns the model index for this column.
	* @return the <code>modelIndex</code> property
	*/
	public int getModelIndex() {
	return modelIndex;
	}

	/**
	* Sets the <code>TableColumn</code>'s identifier to
	* <code>anIdentifier</code>. <p>
	* Note: identifiers are not used by the <code>JTable</code>,
	* they are purely a
	* convenience for the external tagging and location of columns.
	*
	* @param identifier an identifier for this column
	* @see #getIdentifier
	* @beaninfo
	* bound: true
	* description: A unique identifier for this column.
	*/
	public void setIdentifier(Object identifier) {
	Object old = this.identifier;
	this.identifier = identifier;
	firePropertyChange("identifier", old, identifier);
	}


	/**
	* Returns the <code>identifier</code> object for this column.
	* Note identifiers are not used by <code>JTable</code>,
	* they are purely a convenience for external use.
	* If the <code>identifier</code> is <code>null</code>,
	* <code>getIdentifier()</code> returns <code>getHeaderValue</code>
	* as a default.
	*
	* @return the <code>identifier</code> property
	* @see #setIdentifier
	*/
	public Object getIdentifier() {
	return (identifier != null) ? identifier : getHeaderValue();

	}

	/**
	* Sets the <code>Object</code> whose string representation will be
	* used as the value for the <code>headerRenderer</code>. When the
	* <code>TableColumn</code> is created, the default <code>headerValue</code>
	* is <code>null</code>.
	* @param headerValue the new headerValue
	* @see #getHeaderValue
	* @beaninfo
	* bound: true
	* description: The text to be used by the header renderer.
	*/
	public void setHeaderValue(Object headerValue) {
	Object old = this.headerValue;
	this.headerValue = headerValue;
	firePropertyChange("headerValue", old, headerValue);
	}

	/**
	* Returns the <code>Object</code> used as the value for the header
	* renderer.
	*
	* @return the <code>headerValue</code> property
	* @see #setHeaderValue
	*/
	public Object getHeaderValue() {
	return headerValue;
	}

	//
	// Renderers and Editors
	//

	/**
	* Sets the <code>TableCellRenderer</code> used to draw the
	* <code>TableColumn</code>'s header to <code>headerRenderer</code>.
	* <p>
	* It is the header renderers responsibility to render the sorting
	* indicator. If you are using sorting and specify a renderer your
	* renderer must render the sorting indication.
	*
	* @param headerRenderer the new headerRenderer
	*
	* @see #getHeaderRenderer
	* @beaninfo
	* bound: true
	* description: The header renderer.
	*/
	public void setHeaderRenderer(TableCellRenderer headerRenderer) {
	TableCellRenderer old = this.headerRenderer;
	this.headerRenderer = headerRenderer;
	firePropertyChange("headerRenderer", old, headerRenderer);
	}

	/**
	* Returns the <code>TableCellRenderer</code> used to draw the header of the
	* <code>TableColumn</code>. When the <code>headerRenderer</code> is
	* <code>null</code>, the <code>JTableHeader</code>
	* uses its <code>defaultRenderer</code>. The default value for a
	* <code>headerRenderer</code> is <code>null</code>.
	*
	* @return the <code>headerRenderer</code> property
	* @see #setHeaderRenderer
	* @see #setHeaderValue
	* @see javax.swing.table.JTableHeader#getDefaultRenderer()
	*/
	public TableCellRenderer getHeaderRenderer() {
	return headerRenderer;
	}

	/**
	* Sets the <code>TableCellRenderer</code> used by <code>JTable</code>
	* to draw individual values for this column.
	*
	* @param cellRenderer the new cellRenderer
	* @see #getCellRenderer
	* @beaninfo
	* bound: true
	* description: The renderer to use for cell values.
	*/
	public void setCellRenderer(TableCellRenderer cellRenderer) {
	TableCellRenderer old = this.cellRenderer;
	this.cellRenderer = cellRenderer;
	firePropertyChange("cellRenderer", old, cellRenderer);
	}

	/**
	* Returns the <code>TableCellRenderer</code> used by the
	* <code>JTable</code> to draw
	* values for this column. The <code>cellRenderer</code> of the column
	* not only controls the visual look for the column, but is also used to
	* interpret the value object supplied by the <code>TableModel</code>.
	* When the <code>cellRenderer</code> is <code>null</code>,
	* the <code>JTable</code> uses a default renderer based on the
	* class of the cells in that column. The default value for a
	* <code>cellRenderer</code> is <code>null</code>.
	*
	* @return the <code>cellRenderer</code> property
	* @see #setCellRenderer
	* @see JTable#setDefaultRenderer
	*/
	public TableCellRenderer getCellRenderer() {
	return cellRenderer;
	}

	/**
	* Sets the editor to used by when a cell in this column is edited.
	*
	* @param cellEditor the new cellEditor
	* @see #getCellEditor
	* @beaninfo
	* bound: true
	* description: The editor to use for cell values.
	*/
	public void setCellEditor(TableCellEditor cellEditor){
	TableCellEditor old = this.cellEditor;
	this.cellEditor = cellEditor;
	firePropertyChange("cellEditor", old, cellEditor);
	}

	/**
	* Returns the <code>TableCellEditor</code> used by the
	* <code>JTable</code> to edit values for this column. When the
	* <code>cellEditor</code> is <code>null</code>, the <code>JTable</code>
	* uses a default editor based on the
	* class of the cells in that column. The default value for a
	* <code>cellEditor</code> is <code>null</code>.
	*
	* @return the <code>cellEditor</code> property
	* @see #setCellEditor
	* @see JTable#setDefaultEditor
	*/
	public TableCellEditor getCellEditor() {
	return cellEditor;
	}

	/**
	* This method should not be used to set the widths of columns in the
	* <code>JTable</code>, use <code>setPreferredWidth</code> instead.
	* Like a layout manager in the
	* AWT, the <code>JTable</code> adjusts a column's width automatically
	* whenever the
	* table itself changes size, or a column's preferred width is changed.
	* Setting widths programmatically therefore has no long term effect.
	* <p>
	* This method sets this column's width to <code>width</code>.
	* If <code>width</code> exceeds the minimum or maximum width,
	* it is adjusted to the appropriate limiting value.
	* @param width the new width
	* @see #getWidth
	* @see #setMinWidth
	* @see #setMaxWidth
	* @see #setPreferredWidth
	* @see JTable#doLayout()
	* @beaninfo
	* bound: true
	* description: The width of the column.
	*/
	public void setWidth(int width) {
	int old = this.width;
	this.width = Math.min(Math.max(width, minWidth), maxWidth);
	firePropertyChange("width", old, this.width);
	}

	/**
	* Returns the width of the <code>TableColumn</code>. The default width is
	* 75.
	*
	* @return the <code>width</code> property
	* @see #setWidth
	*/
	public int getWidth() {
	return width;
	}

	/**
	* Sets this column's preferred width to <code>preferredWidth</code>.
	* If <code>preferredWidth</code> exceeds the minimum or maximum width,
	* it is adjusted to the appropriate limiting value.
	* <p>
	* For details on how the widths of columns in the <code>JTable</code>
	* (and <code>JTableHeader</code>) are calculated from the
	* <code>preferredWidth</code>,
	* see the <code>doLayout</code> method in <code>JTable</code>.
	*
	* @param preferredWidth the new preferred width
	* @see #getPreferredWidth
	* @see JTable#doLayout()
	* @beaninfo
	* bound: true
	* description: The preferred width of the column.
	*/
	public void setPreferredWidth(int preferredWidth) {
	int old = this.preferredWidth;
	this.preferredWidth = Math.min(Math.max(preferredWidth, minWidth), maxWidth);
	firePropertyChange("preferredWidth", old, this.preferredWidth);
	}

	/**
	* Returns the preferred width of the <code>TableColumn</code>.
	* The default preferred width is 75.
	*
	* @return the <code>preferredWidth</code> property
	* @see #setPreferredWidth
	*/
	public int getPreferredWidth() {
	return preferredWidth;
	}

	/**
	* Sets the <code>TableColumn</code>'s minimum width to
	* <code>minWidth</code>,
	* adjusting the new minimum width if necessary to ensure that
	* 0 <= <code>minWidth</code> <= <code>maxWidth</code>.
	* For example, if the <code>minWidth</code> argument is negative,
	* this method sets the <code>minWidth</code> property to 0.
	*
	* <p>
	* If the value of the
	* <code>width</code> or <code>preferredWidth</code> property
	* is less than the new minimum width,
	* this method sets that property to the new minimum width.
	*
	* @param minWidth the new minimum width
	* @see #getMinWidth
	* @see #setPreferredWidth
	* @see #setMaxWidth
	* @beaninfo
	* bound: true
	* description: The minimum width of the column.
	*/
	public void setMinWidth(int minWidth) {
	int old = this.minWidth;
	this.minWidth = Math.max(Math.min(minWidth, maxWidth), 0);
	if (width < this.minWidth) {
	setWidth(this.minWidth);
	}
	if (preferredWidth < this.minWidth) {
	setPreferredWidth(this.minWidth);
	}
	firePropertyChange("minWidth", old, this.minWidth);
	}

	/**
	* Returns the minimum width for the <code>TableColumn</code>. The
	* <code>TableColumn</code>'s width can't be made less than this either
	* by the user or programmatically.
	*
	* @return the <code>minWidth</code> property
	* @see #setMinWidth
	* @see #TableColumn(int, int, TableCellRenderer, TableCellEditor)
	*/
	public int getMinWidth() {
	return minWidth;
	}

	/**
	* Sets the <code>TableColumn</code>'s maximum width to
	* <code>maxWidth</code> or,
	* if <code>maxWidth</code> is less than the minimum width,
	* to the minimum width.
	*
	* <p>
	* If the value of the
	* <code>width</code> or <code>preferredWidth</code> property
	* is more than the new maximum width,
	* this method sets that property to the new maximum width.
	*
	* @param maxWidth the new maximum width
	* @see #getMaxWidth
	* @see #setPreferredWidth
	* @see #setMinWidth
	* @beaninfo
	* bound: true
	* description: The maximum width of the column.
	*/
	public void setMaxWidth(int maxWidth) {
	int old = this.maxWidth;
	this.maxWidth = Math.max(minWidth, maxWidth);
	if (width > this.maxWidth) {
	setWidth(this.maxWidth);
	}
	if (preferredWidth > this.maxWidth) {
	setPreferredWidth(this.maxWidth);
	}
	firePropertyChange("maxWidth", old, this.maxWidth);
	}

	/**
	* Returns the maximum width for the <code>TableColumn</code>. The
	* <code>TableColumn</code>'s width can't be made larger than this
	* either by the user or programmatically. The default maxWidth
	* is Integer.MAX_VALUE.
	*
	* @return the <code>maxWidth</code> property
	* @see #setMaxWidth
	*/
	public int getMaxWidth() {
	return maxWidth;
	}

	/**
	* Sets whether this column can be resized.
	*
	* @param isResizable if true, resizing is allowed; otherwise false
	* @see #getResizable
	* @beaninfo
	* bound: true
	* description: Whether or not this column can be resized.
	*/
	public void setResizable(boolean isResizable) {
	boolean old = this.isResizable;
	this.isResizable = isResizable;
	firePropertyChange("isResizable", old, this.isResizable);
	}

	/**
	* Returns true if the user is allowed to resize the
	* <code>TableColumn</code>'s
	* width, false otherwise. You can change the width programmatically
	* regardless of this setting. The default is true.
	*
	* @return the <code>isResizable</code> property
	* @see #setResizable
	*/
	public boolean getResizable() {
	return isResizable;
	}

	/**
	* Resizes the <code>TableColumn</code> to fit the width of its header cell.
	* This method does nothing if the header renderer is <code>null</code>
	* (the default case). Otherwise, it sets the minimum, maximum and preferred
	* widths of this column to the widths of the minimum, maximum and preferred
	* sizes of the Component delivered by the header renderer.
	* The transient "width" property of this TableColumn is also set to the
	* preferred width. Note this method is not used internally by the table
	* package.
	*
	* @see #setPreferredWidth
	*/
	public void sizeWidthToFit() {
	if (headerRenderer == null) {
	return;
	}
	Component c = headerRenderer.getTableCellRendererComponent(null,
	getHeaderValue(), false, false, 0, 0);

	setMinWidth(c.getMinimumSize().width);
	setMaxWidth(c.getMaximumSize().width);
	setPreferredWidth(c.getPreferredSize().width);

	setWidth(getPreferredWidth());
	}

	/**
	* This field was not used in previous releases and there are
	* currently no plans to support it in the future.
	*
	* @deprecated as of Java 2 platform v1.3
	*/
	@Deprecated
	public void disableResizedPosting() {
	resizedPostingDisableCount++;
	}

	/**
	* This field was not used in previous releases and there are
	* currently no plans to support it in the future.
	*
	* @deprecated as of Java 2 platform v1.3
	*/
	@Deprecated
	public void enableResizedPosting() {
	resizedPostingDisableCount--;
	}

	//
	// Property Change Support
	//

	/**
	* Adds a <code>PropertyChangeListener</code> to the listener list.
	* The listener is registered for all properties.
	* <p>
	* A <code>PropertyChangeEvent</code> will get fired in response to an
	* explicit call to <code>setFont</code>, <code>setBackground</code>,
	* or <code>setForeground</code> on the
	* current component. Note that if the current component is
	* inheriting its foreground, background, or font from its
	* container, then no event will be fired in response to a
	* change in the inherited property.
	*
	* @param listener the listener to be added
	*
	*/
	public synchronized void addPropertyChangeListener(
	PropertyChangeListener listener) {
	if (changeSupport == null) {
	changeSupport = new SwingPropertyChangeSupport(this);
	}
	changeSupport.addPropertyChangeListener(listener);
	}

	/**
	* Removes a <code>PropertyChangeListener</code> from the listener list.
	* The <code>PropertyChangeListener</code> to be removed was registered
	* for all properties.
	*
	* @param listener the listener to be removed
	*
	*/

	public synchronized void removePropertyChangeListener(
	PropertyChangeListener listener) {
	if (changeSupport != null) {
	changeSupport.removePropertyChangeListener(listener);
	}
	}

	/**
	* Returns an array of all the <code>PropertyChangeListener</code>s added
	* to this TableColumn with addPropertyChangeListener().
	*
	* @return all of the <code>PropertyChangeListener</code>s added or an empty
	* array if no listeners have been added
	* @since 1.4
	*/
	public synchronized PropertyChangeListener[] getPropertyChangeListeners() {
	if (changeSupport == null) {
	return new PropertyChangeListener[0];
	}
	return changeSupport.getPropertyChangeListeners();
	}

	//
	// Protected Methods
	//

	/**
	* As of Java 2 platform v1.3, this method is not called by the <code>TableColumn</code>
	* constructor. Previously this method was used by the
	* <code>TableColumn</code> to create a default header renderer.
	* As of Java 2 platform v1.3, the default header renderer is <code>null</code>.
	* <code>JTableHeader</code> now provides its own shared default
	* renderer, just as the <code>JTable</code> does for its cell renderers.
	*
	* @return the default header renderer
	* @see javax.swing.table.JTableHeader#createDefaultRenderer()
	*/
	protected TableCellRenderer createDefaultHeaderRenderer() {
	DefaultTableCellRenderer label = new DefaultTableCellRenderer() {
	public Component getTableCellRendererComponent(JTable table, Object value,
	boolean isSelected, boolean hasFocus, int row, int column) {
	if (table != null) {
	JTableHeader header = table.getTableHeader();
	if (header != null) {
	setForeground(header.getForeground());
	setBackground(header.getBackground());
	setFont(header.getFont());
	}
	}

	setText((value == null) ? "" : value.toString());
	setBorder(UIManager.getBorder("TableHeader.cellBorder"));
	return this;
	}
	};
	label.setHorizontalAlignment(JLabel.CENTER);
	return label;
	}

	} // End of class TableColumn

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