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