Source for java.util.prefs.NodeChangeEvent

   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:      */
  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:      */
  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:      */
  96:     public Preferences getChild() {
  97:         return child;
  98:     }
  99: 
 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: }