/*

 * 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

 * particular file as subject to the "Classpath" exception as provided

 *

 * 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.

 *

 */

package java.util.prefs;

import java.io.NotSerializableException;

/**

 * An event emitted by a <tt>Preferences</tt> node to indicate that

 * a child of that node has been added or removed.<p>

 *

 * Note, that although NodeChangeEvent inherits Serializable interface from

 * java.util.EventObject, it is not intended to be Serializable. Appropriate

 * serialization methods are implemented to throw NotSerializableException.

 *

 * @author  Josh Bloch

 * @see     Preferences

 * @see     NodeChangeListener

 * @see     PreferenceChangeEvent

 * @since   1.4

 * @serial  exclude

 */

public class NodeChangeEvent extends java.util.EventObject {

    /**

     * The node that was added or removed.

     *

     * @serial

     */

    private Preferences child;

    /**

     * Constructs a new <code>NodeChangeEvent</code> instance.

     *

     * @param parent  The parent of the node that was added or removed.

     * @param child   The node that was added or removed.

     */

    public NodeChangeEvent(Preferences parent, Preferences child) {

        super(parent);

        this.child = child;

    }

    /**

     * Returns the parent of the node that was added or removed.

     *

     * @return  The parent Preferences node whose child was added or removed

     */

    public Preferences getParent() {

        return (Preferences) getSource();

    }

    /**

     * Returns the node that was added or removed.

     *

     * @return  The node that was added or removed.

     */

    public Preferences getChild() {

        return child;

    }

    /**

     * Throws NotSerializableException, since NodeChangeEvent objects are not

     * intended to be serializable.

     */

     private void writeObject(java.io.ObjectOutputStream out)

                                               throws NotSerializableException {

         throw new NotSerializableException("Not serializable.");

     }

    /**

     * Throws NotSerializableException, since NodeChangeEvent objects are not

     * intended to be serializable.

     */

     private void readObject(java.io.ObjectInputStream in)

                                               throws NotSerializableException {

         throw new NotSerializableException("Not serializable.");

     }

    // Defined so that this class isn't flagged as a potential problem when

    // searches for missing serialVersionUID fields are done.

    private static final long serialVersionUID = 8068949086596572957L;

}