001 /*
002 * Copyright 2000-2003 Sun Microsystems, Inc. All Rights Reserved.
003 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004 *
005 * This code is free software; you can redistribute it and/or modify it
006 * under the terms of the GNU General Public License version 2 only, as
007 * published by the Free Software Foundation. Sun designates this
008 * particular file as subject to the "Classpath" exception as provided
009 * by Sun in the LICENSE file that accompanied this code.
010 *
011 * This code is distributed in the hope that it will be useful, but WITHOUT
012 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
013 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
014 * version 2 for more details (a copy is included in the LICENSE file that
015 * accompanied this code).
016 *
017 * You should have received a copy of the GNU General Public License version
018 * 2 along with this work; if not, write to the Free Software Foundation,
019 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
020 *
021 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
022 * CA 95054 USA or visit www.sun.com if you need additional information or
023 * have any questions.
024 */
025
026 package java.util.prefs;
027
028 import java.io.NotSerializableException;
029
030 /**
031 * An event emitted by a <tt>Preferences</tt> node to indicate that
032 * a child of that node has been added or removed.<p>
033 *
034 * Note, that although NodeChangeEvent inherits Serializable interface from
035 * java.util.EventObject, it is not intended to be Serializable. Appropriate
036 * serialization methods are implemented to throw NotSerializableException.
037 *
038 * @author Josh Bloch
039 * @version $I$, $G$
040 * @see Preferences
041 * @see NodeChangeListener
042 * @see PreferenceChangeEvent
043 * @since 1.4
044 * @serial exclude
045 */
046
047 public class NodeChangeEvent extends java.util.EventObject {
048 /**
049 * The node that was added or removed.
050 *
051 * @serial
052 */
053 private Preferences child;
054
055 /**
056 * Constructs a new <code>NodeChangeEvent</code> instance.
057 *
058 * @param parent The parent of the node that was added or removed.
059 * @param child The node that was added or removed.
060 */
061 public NodeChangeEvent(Preferences parent, Preferences child) {
062 super (parent);
063 this .child = child;
064 }
065
066 /**
067 * Returns the parent of the node that was added or removed.
068 *
069 * @return The parent Preferences node whose child was added or removed
070 */
071 public Preferences getParent() {
072 return (Preferences) getSource();
073 }
074
075 /**
076 * Returns the node that was added or removed.
077 *
078 * @return The node that was added or removed.
079 */
080 public Preferences getChild() {
081 return child;
082 }
083
084 /**
085 * Throws NotSerializableException, since NodeChangeEvent objects are not
086 * intended to be serializable.
087 */
088 private void writeObject(java.io.ObjectOutputStream out)
089 throws NotSerializableException {
090 throw new NotSerializableException("Not serializable.");
091 }
092
093 /**
094 * Throws NotSerializableException, since NodeChangeEvent objects are not
095 * intended to be serializable.
096 */
097 private void readObject(java.io.ObjectInputStream in)
098 throws NotSerializableException {
099 throw new NotSerializableException("Not serializable.");
100 }
101
102 // Defined so that this class isn't flagged as a potential problem when
103 // searches for missing serialVersionUID fields are done.
104 private static final long serialVersionUID = 8068949086596572957L;
105 }
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