content: /*
   * Copyright (c) 2000, 2003, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
   * particular file as subject to the "Classpath" exception as provided
   * by Oracle in the LICENSE file that accompanied this code.
   *
   * This code is distributed in the hope that it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   * version 2 for more details (a copy is included in the LICENSE file that
   * accompanied this code).
   *
   * You should have received a copy of the GNU General Public License version
   * 2 along with this work; if not, write to the Free Software Foundation,
   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
   * or visit www.oracle.com if you need additional information or have any
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   */
  
  package java.util.prefs;
  
  import java.io.NotSerializableException;
  
  /**
   * An event emitted by a <tt>Preferences</tt> node to indicate that
   * a preference has been added, removed or has had its value changed.<p>
   *
   * Note, that although PreferenceChangeEvent inherits Serializable interface
   * from EventObject, it is not intended to be Serializable. Appropriate
   * serialization methods are implemented to throw NotSerializableException.
   *
   * @author  Josh Bloch
   * @see Preferences
   * @see PreferenceChangeListener
   * @see NodeChangeEvent
   * @since   1.4
   * @serial exclude
   */
  public class PreferenceChangeEvent extends java.util.EventObject {
  
      /**
       * Key of the preference that changed.
       *
       * @serial
       */
      private String key;
  
      /**
       * New value for preference, or <tt>null</tt> if it was removed.
       *
       * @serial
       */
      private String newValue;
  
      /**
       * Constructs a new <code>PreferenceChangeEvent</code> instance.
       *
       * @param node  The Preferences node that emitted the event.
       * @param key  The key of the preference that was changed.
       * @param newValue  The new value of the preference, or <tt>null</tt>
       *                  if the preference is being removed.
       */
      public PreferenceChangeEvent(Preferences node, String key,
                                   String newValue) {
          super(node);
          this.key = key;
          this.newValue = newValue;
      }
  
      /**
       * Returns the preference node that emitted the event.
       *
       * @return  The preference node that emitted the event.
       */
      public Preferences getNode() {
          return (Preferences) getSource();
      }
  
      /**
       * Returns the key of the preference that was changed.
       *
       * @return  The key of the preference that was changed.
       */
      public String getKey() {
          return key;
      }
  
      /**
       * Returns the new value for the preference.
       *
       * @return  The new value for the preference, or <tt>null</tt> if the
       *          preference was removed.
       */
      public String getNewValue() {
          return newValue;
      }
  
      /**
       * Throws NotSerializableException, since NodeChangeEvent objects
       * are not intended to be serializable.
       */
       private void writeObject(java.io.ObjectOutputStream out)
                                                 throws NotSerializableException {
           throw new NotSerializableException("Not serializable.");
       }
  
      /**
       * Throws NotSerializableException, since PreferenceChangeEvent objects
       * are not intended to be serializable.
       */
       private void readObject(java.io.ObjectInputStream in)
                                                 throws NotSerializableException {
           throw new NotSerializableException("Not serializable.");
       }
  
      // Defined so that this class isn't flagged as a potential problem when
      // searches for missing serialVersionUID fields are done.
      private static final long serialVersionUID = 793724513368024975L;
  }
  