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/* NodeChangeEvent - ObjectEvent fired when a Preference node is added/removed

   Copyright (C) 2001, 2006 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation; either version 2, or (at your option)

any later version.

GNU Classpath 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 for more details.

You should have received a copy of the GNU General Public License

along with GNU Classpath; see the file COPYING.  If not, write to the

Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

02110-1301 USA.

Linking this library statically or dynamically with other modules is

making a combined work based on this library.  Thus, the terms and

conditions of the GNU General Public License cover the whole

combination.

As a special exception, the copyright holders of this library give you

permission to link this library with independent modules to produce an

executable, regardless of the license terms of these independent

modules, and to copy and distribute the resulting executable under

terms of your choice, provided that you also meet, for each linked

independent module, the terms and conditions of the license of that

module.  An independent module is a module which is not derived from

or based on this library.  If you modify this library, you may extend

this exception to your version of the library, but you are not

obligated to do so.  If you do not wish to do so, delete this

exception statement from your version. */

package java.util.prefs;

import java.io.IOException;

import java.io.NotSerializableException;

import java.io.ObjectInputStream;

import java.io.ObjectOutputStream;

import java.util.EventObject;

/**

 * ObjectEvent fired when a Preference node is added/removed.

 * This event is only generated when a new subnode is added or a subnode is

 * removed from a preference node. Changes in the entries of a preference node

 * are indicated with a <code>PreferenceChangeEvent</code>.

 * <p>

 * Note that although this class is marked as serializable, attempts to

 * serialize it will fail with NotSerializableException.

 *

 * @since 1.4

 * @author Mark Wielaard (mark@klomp.org)

 */

public class NodeChangeEvent extends EventObject {

  // We have this to placate the compiler.

  private static final long serialVersionUID =8068949086596572957L;

    /**

     * The sub node that was added or removed.

     * Defined transient just like <code>EventObject.source</code> since

     * this object should be serializable, but Preferences is in general not

     * serializable.

     */

    private final transient Preferences child;

    /**

     * Creates a new NodeChangeEvent.

     *

     * @param parentNode The source preference node from which a subnode was

     * added or removed

     * @param childNode The preference node that was added or removed

     */

    public NodeChangeEvent(Preferences parentNode, Preferences childNode) {

        super(parentNode);

        child = childNode;

    }

    /**

     * Returns the source parent preference node from which a subnode was

     * added or removed.

     */

    public Preferences getParent() {

        return (Preferences) source;

    }

    /**

     * Returns the child preference subnode that was added or removed.

     * To see wether it is still a valid preference node one has to call

     * <code>event.getChild().nodeExists("")</code>.

     */

    public Preferences getChild() {

        return child;

    }

    private void readObject(ObjectInputStream ois)

      throws IOException

    {

      throw new NotSerializableException("LineEvent is not serializable");

    }

    private void writeObject(ObjectOutputStream oos)

      throws IOException

    {

      throw new NotSerializableException("LineEvent is not serializable");

    }

}