1/*
2 * Copyright (c) 2000, 2003, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26package java.util.prefs;
27
28import java.io.NotSerializableException;
29
30/**
31 * An event emitted by a <tt>Preferences</tt> node to indicate that
32 * a child of that node has been added or removed.<p>
33 *
34 * Note, that although NodeChangeEvent inherits Serializable interface from
35 * java.util.EventObject, it is not intended to be Serializable. Appropriate
36 * serialization methods are implemented to throw NotSerializableException.
37 *
38 * @author  Josh Bloch
39 * @see     Preferences
40 * @see     NodeChangeListener
41 * @see     PreferenceChangeEvent
42 * @since   1.4
43 * @serial  exclude
44 */
45
46public class NodeChangeEvent extends java.util.EventObject {
47    /**
48     * The node that was added or removed.
49     *
50     * @serial
51     */
52    private Preferences child;
53
54    /**
55     * Constructs a new <code>NodeChangeEvent</code> instance.
56     *
57     * @param parent  The parent of the node that was added or removed.
58     * @param child   The node that was added or removed.
59     */
60    public NodeChangeEvent(Preferences parent, Preferences child) {
61        super(parent);
62        this.child = child;
63    }
64
65    /**
66     * Returns the parent of the node that was added or removed.
67     *
68     * @return  The parent Preferences node whose child was added or removed
69     */
70    public Preferences getParent() {
71        return (Preferences) getSource();
72    }
73
74    /**
75     * Returns the node that was added or removed.
76     *
77     * @return  The node that was added or removed.
78     */
79    public Preferences getChild() {
80        return child;
81    }
82
83    /**
84     * Throws NotSerializableException, since NodeChangeEvent objects are not
85     * intended to be serializable.
86     */
87     private void writeObject(java.io.ObjectOutputStream out)
88                                               throws NotSerializableException {
89         throw new NotSerializableException("Not serializable.");
90     }
91
92    /**
93     * Throws NotSerializableException, since NodeChangeEvent objects are not
94     * intended to be serializable.
95     */
96     private void readObject(java.io.ObjectInputStream in)
97                                               throws NotSerializableException {
98         throw new NotSerializableException("Not serializable.");
99     }
100
101    // Defined so that this class isn't flagged as a potential problem when
102    // searches for missing serialVersionUID fields are done.
103    private static final long serialVersionUID = 8068949086596572957L;
104}
105