1 /* NodeChangeEvent - ObjectEvent fired when a Preference node is added/removed
2    Copyright (C) 2001, 2006 Free Software Foundation, Inc.
3 
4 This file is part of GNU Classpath.
5 
6 GNU Classpath is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
9 any later version.
10 
11 GNU Classpath is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14 General Public License for more details.
15 
16 You should have received a copy of the GNU General Public License
17 along with GNU Classpath; see the file COPYING.  If not, write to the
18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
19 02110-1301 USA.
20 
21 Linking this library statically or dynamically with other modules is
22 making a combined work based on this library.  Thus, the terms and
23 conditions of the GNU General Public License cover the whole
24 combination.
25 
26 As a special exception, the copyright holders of this library give you
27 permission to link this library with independent modules to produce an
28 executable, regardless of the license terms of these independent
29 modules, and to copy and distribute the resulting executable under
30 terms of your choice, provided that you also meet, for each linked
31 independent module, the terms and conditions of the license of that
32 module.  An independent module is a module which is not derived from
33 or based on this library.  If you modify this library, you may extend
34 this exception to your version of the library, but you are not
35 obligated to do so.  If you do not wish to do so, delete this
36 exception statement from your version. */
37 
38 package java.util.prefs;
39 
40 import java.io.IOException;
41 import java.io.NotSerializableException;
42 import java.io.ObjectInputStream;
43 import java.io.ObjectOutputStream;
44 import java.util.EventObject;
45 
46 /**
47  * ObjectEvent fired when a Preference node is added/removed.
48  * This event is only generated when a new subnode is added or a subnode is
49  * removed from a preference node. Changes in the entries of a preference node
50  * are indicated with a <code>PreferenceChangeEvent</code>.
51  * <p>
52  * Note that although this class is marked as serializable, attempts to
53  * serialize it will fail with NotSerializableException.
54  *
55  * @since 1.4
56  * @author Mark Wielaard (mark@klomp.org)
57  */
58 public class NodeChangeEvent extends EventObject {
59 
60   // We have this to placate the compiler.
61   private static final long serialVersionUID =8068949086596572957L;
62 
63     /**
64      * The sub node that was added or removed.
65      * Defined transient just like <code>EventObject.source</code> since
66      * this object should be serializable, but Preferences is in general not
67      * serializable.
68      */
69     private final transient Preferences child;
70 
71     /**
72      * Creates a new NodeChangeEvent.
73      *
74      * @param parentNode The source preference node from which a subnode was
75      * added or removed
76      * @param childNode The preference node that was added or removed
77      */
NodeChangeEvent(Preferences parentNode, Preferences childNode)78     public NodeChangeEvent(Preferences parentNode, Preferences childNode) {
79         super(parentNode);
80         child = childNode;
81     }
82 
83     /**
84      * Returns the source parent preference node from which a subnode was
85      * added or removed.
86      */
getParent()87     public Preferences getParent() {
88         return (Preferences) source;
89     }
90 
91     /**
92      * Returns the child preference subnode that was added or removed.
93      * To see wether it is still a valid preference node one has to call
94      * <code>event.getChild().nodeExists("")</code>.
95      */
getChild()96     public Preferences getChild() {
97         return child;
98     }
99 
readObject(ObjectInputStream ois)100     private void readObject(ObjectInputStream ois)
101       throws IOException
102     {
103       throw new NotSerializableException("LineEvent is not serializable");
104     }
105 
writeObject(ObjectOutputStream oos)106     private void writeObject(ObjectOutputStream oos)
107       throws IOException
108     {
109       throw new NotSerializableException("LineEvent is not serializable");
110     }
111 }
112