001 /* NodeChangeEvent - ObjectEvent fired when a Preference node is added/removed 002 Copyright (C) 2001, 2006 Free Software Foundation, Inc. 003 004 This file is part of GNU Classpath. 005 006 GNU Classpath is free software; you can redistribute it and/or modify 007 it under the terms of the GNU General Public License as published by 008 the Free Software Foundation; either version 2, or (at your option) 009 any later version. 010 011 GNU Classpath is distributed in the hope that it will be useful, but 012 WITHOUT ANY WARRANTY; without even the implied warranty of 013 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014 General Public License for more details. 015 016 You should have received a copy of the GNU General Public License 017 along with GNU Classpath; see the file COPYING. If not, write to the 018 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 019 02110-1301 USA. 020 021 Linking this library statically or dynamically with other modules is 022 making a combined work based on this library. Thus, the terms and 023 conditions of the GNU General Public License cover the whole 024 combination. 025 026 As a special exception, the copyright holders of this library give you 027 permission to link this library with independent modules to produce an 028 executable, regardless of the license terms of these independent 029 modules, and to copy and distribute the resulting executable under 030 terms of your choice, provided that you also meet, for each linked 031 independent module, the terms and conditions of the license of that 032 module. An independent module is a module which is not derived from 033 or based on this library. If you modify this library, you may extend 034 this exception to your version of the library, but you are not 035 obligated to do so. If you do not wish to do so, delete this 036 exception statement from your version. */ 037 038 package java.util.prefs; 039 040 import java.io.IOException; 041 import java.io.NotSerializableException; 042 import java.io.ObjectInputStream; 043 import java.io.ObjectOutputStream; 044 import java.util.EventObject; 045 046 /** 047 * ObjectEvent fired when a Preference node is added/removed. 048 * This event is only generated when a new subnode is added or a subnode is 049 * removed from a preference node. Changes in the entries of a preference node 050 * are indicated with a <code>PreferenceChangeEvent</code>. 051 * <p> 052 * Note that although this class is marked as serializable, attempts to 053 * serialize it will fail with NotSerializableException. 054 * 055 * @since 1.4 056 * @author Mark Wielaard (mark@klomp.org) 057 */ 058 public class NodeChangeEvent extends EventObject { 059 060 // We have this to placate the compiler. 061 private static final long serialVersionUID =8068949086596572957L; 062 063 /** 064 * The sub node that was added or removed. 065 * Defined transient just like <code>EventObject.source</code> since 066 * this object should be serializable, but Preferences is in general not 067 * serializable. 068 */ 069 private final transient Preferences child; 070 071 /** 072 * Creates a new NodeChangeEvent. 073 * 074 * @param parentNode The source preference node from which a subnode was 075 * added or removed 076 * @param childNode The preference node that was added or removed 077 */ 078 public NodeChangeEvent(Preferences parentNode, Preferences childNode) { 079 super(parentNode); 080 child = childNode; 081 } 082 083 /** 084 * Returns the source parent preference node from which a subnode was 085 * added or removed. 086 */ 087 public Preferences getParent() { 088 return (Preferences) source; 089 } 090 091 /** 092 * Returns the child preference subnode that was added or removed. 093 * To see wether it is still a valid preference node one has to call 094 * <code>event.getChild().nodeExists("")</code>. 095 */ 096 public Preferences getChild() { 097 return child; 098 } 099 100 private void readObject(ObjectInputStream ois) 101 throws IOException 102 { 103 throw new NotSerializableException("LineEvent is not serializable"); 104 } 105 106 private void writeObject(ObjectOutputStream oos) 107 throws IOException 108 { 109 throw new NotSerializableException("LineEvent is not serializable"); 110 } 111 }