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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

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 */

package javax.swing.event;

import java.util.EventObject;

import javax.swing.tree.TreePath;

/**

 * An event that characterizes a change in the current

 * selection.  The change is based on any number of paths.

 * TreeSelectionListeners will generally query the source of

 * the event for the new selected status of each potentially

 * changed row.

 * <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}.

 *

 * @see TreeSelectionListener

 * @see javax.swing.tree.TreeSelectionModel

 *

 * @author Scott Violet

 */

public class TreeSelectionEvent extends EventObject

{

    /** Paths this event represents. */

    protected TreePath[]     paths;

    /** For each path identifies if that path is in fact new. */

    protected boolean[]       areNew;

    /** leadSelectionPath before the paths changed, may be null. */

    protected TreePath        oldLeadSelectionPath;

    /** leadSelectionPath after the paths changed, may be null. */

    protected TreePath        newLeadSelectionPath;

    /**

      * Represents a change in the selection of a TreeSelectionModel.

      * paths identifies the paths that have been either added or

      * removed from the selection.

      *

      * @param source source of event

      * @param paths the paths that have changed in the selection

      */

    public TreeSelectionEvent(Object source, TreePath[] paths,

                              boolean[] areNew, TreePath oldLeadSelectionPath,

                              TreePath newLeadSelectionPath)

    {

        super(source);

        this.paths = paths;

        this.areNew = areNew;

        this.oldLeadSelectionPath = oldLeadSelectionPath;

        this.newLeadSelectionPath = newLeadSelectionPath;

    }

    /**

      * Represents a change in the selection of a TreeSelectionModel.

      * path identifies the path that have been either added or

      * removed from the selection.

      *

      * @param source source of event

      * @param path the path that has changed in the selection

      * @param isNew whether or not the path is new to the selection, false

      * means path was removed from the selection.

      */

    public TreeSelectionEvent(Object source, TreePath path, boolean isNew,

                              TreePath oldLeadSelectionPath,

                              TreePath newLeadSelectionPath)

    {

        super(source);

        paths = new TreePath[1];

        paths[0] = path;

        areNew = new boolean[1];

        areNew[0] = isNew;

        this.oldLeadSelectionPath = oldLeadSelectionPath;

        this.newLeadSelectionPath = newLeadSelectionPath;

    }

    /**

      * Returns the paths that have been added or removed from the

      * selection.

      */

    public TreePath[] getPaths()

    {

        int                  numPaths;

        TreePath[]          retPaths;

        numPaths = paths.length;

        retPaths = new TreePath[numPaths];

        System.arraycopy(paths, 0, retPaths, 0, numPaths);

        return retPaths;

    }

    /**

      * Returns the first path element.

      */

    public TreePath getPath()

    {

        return paths[0];

    }

    /**

     * Returns whether the path identified by {@code getPath} was

     * added to the selection.  A return value of {@code true}

     * indicates the path identified by {@code getPath} was added to

     * the selection. A return value of {@code false} indicates {@code

     * getPath} was selected, but is no longer selected.

     *

     * @return {@code true} if {@code getPath} was added to the selection,

     *         {@code false} otherwise

     */

    public boolean isAddedPath() {

        return areNew[0];

    }

    /**

     * Returns whether the specified path was added to the selection.

     * A return value of {@code true} indicates the path identified by

     * {@code path} was added to the selection. A return value of

     * {@code false} indicates {@code path} is no longer selected. This method

     * is only valid for the paths returned from {@code getPaths()}; invoking

     * with a path not included in {@code getPaths()} throws an

     * {@code IllegalArgumentException}.

     *

     * @param path the path to test

     * @return {@code true} if {@code path} was added to the selection,

     *         {@code false} otherwise

     * @throws IllegalArgumentException if {@code path} is not contained

     *         in {@code getPaths}

     * @see #getPaths

     */

    public boolean isAddedPath(TreePath path) {

        for(int counter = paths.length - 1; counter >= 0; counter--)

            if(paths[counter].equals(path))

                return areNew[counter];

        throw new IllegalArgumentException("path is not a path identified by the TreeSelectionEvent");

    }

    /**

     * Returns whether the path at {@code getPaths()[index]} was added

     * to the selection.  A return value of {@code true} indicates the

     * path was added to the selection. A return value of {@code false}

     * indicates the path is no longer selected.

     *

     * @param index the index of the path to test

     * @return {@code true} if the path was added to the selection,

     *         {@code false} otherwise

     * @throws IllegalArgumentException if index is outside the range of

     *         {@code getPaths}

     * @see #getPaths

     *

     * @since 1.3

     */

    public boolean isAddedPath(int index) {

        if (paths == null || index < 0 || index >= paths.length) {

            throw new IllegalArgumentException("index is beyond range of added paths identified by TreeSelectionEvent");

        }

        return areNew[index];

    }

    /**

     * Returns the path that was previously the lead path.

     */

    public TreePath getOldLeadSelectionPath() {

        return oldLeadSelectionPath;

    }

    /**

     * Returns the current lead path.

     */

    public TreePath getNewLeadSelectionPath() {

        return newLeadSelectionPath;

    }

    /**

     * Returns a copy of the receiver, but with the source being newSource.

     */

    public Object cloneWithSource(Object newSource) {

      // Fix for IE bug - crashing

      return new TreeSelectionEvent(newSource, paths,areNew,

                                    oldLeadSelectionPath,

                                    newLeadSelectionPath);

    }

}