libjava/java/util/prefs/NodeChangeEvent.java

   1 /* NodeChangeEvent - ObjectEvent fired when a Preference node is added/removed
   2    Copyright (C) 2001 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., 59 Temple Place, Suite 330, Boston, MA
  19 02111-1307 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.util.EventObject;
  41
  42 /**
  43  * ObjectEvent fired when a Preference node is added/removed.
  44  * This event is only generated when a new subnode is added or a subnode is
  45  * removed from a preference node. Changes in the entries of a preference node
  46  * are indicated with a <code>PreferenceChangeEvent</code>.
  47  *
  48  * @since 1.4
  49  * @author Mark Wielaard (mark@klomp.org)
  50  */
  51 public class NodeChangeEvent extends EventObject {
  52
  53   private static final long serialVersionUID =8068949086596572957L;
  54
  55     /**
  56      * The sub node that was added or removed.
  57      * Defined transient just like <code>EventObject.source</code> since
  58      * this object should be serializable, but Preferences is in general not
  59      * serializable.
  60      */
  61     private final transient Preferences child;
  62
  63     /**
  64      * Creates a new NodeChangeEvent.
  65      *
  66      * @param parentNode The source preference node from which a subnode was
  67      * added or removed
  68      * @param childNode The preference node that was added or removed
  69      */
  70     public NodeChangeEvent(Preferences parentNode, Preferences childNode) {
  71         super(parentNode);
  72         child = childNode;
  73     }
  74
  75     /**
  76      * Returns the source parent preference node from which a subnode was
  77      * added or removed.
  78      */
  79     public Preferences getParent() {
  80         return (Preferences) source;
  81     }
  82
  83     /**
  84      * Returns the child preference subnode that was added or removed.
  85      * To see wether it is still a valid preference node one has to call
  86      * <code>event.getChild().nodeExists("")</code>.
  87      */
  88     public Preferences getChild() {
  89         return child;
  90     }
  91 }