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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  
26  package java.util.prefs;
27  
28  import 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  
46  public 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 }