| /* Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package java.util.prefs; |
| |
| import java.io.IOException; |
| import java.io.NotSerializableException; |
| import java.io.ObjectInputStream; |
| import java.io.ObjectOutputStream; |
| import java.io.Serializable; |
| import java.util.EventObject; |
| |
| /** |
| * This is the event class to indicate that a preference has been added, deleted |
| * or updated. |
| * <p> |
| * Please note that although the class is marked as {@code Serializable} by |
| * inheritance from {@code EventObject}, this type is not intended to be serialized |
| * so the serialization methods do nothing but throw a {@code NotSerializableException}. |
| * |
| * @see java.util.prefs.Preferences |
| * @see java.util.prefs.PreferenceChangeListener |
| * |
| * @since 1.4 |
| */ |
| public class PreferenceChangeEvent extends EventObject implements Serializable { |
| |
| private static final long serialVersionUID = 793724513368024975L; |
| |
| private final Preferences node; |
| |
| private final String key; |
| |
| private final String value; |
| |
| /** |
| * Construct a new {@code PreferenceChangeEvent} instance. |
| * |
| * @param p |
| * the {@code Preferences} instance that fired this event; this object is |
| * considered as the event's source. |
| * @param k |
| * the changed preference key. |
| * @param v |
| * the new value of the changed preference, this value can be |
| * {@code null}, which means the preference has been removed. |
| */ |
| public PreferenceChangeEvent(Preferences p, String k, String v) { |
| super(p); |
| node = p; |
| key = k; |
| value = v; |
| } |
| |
| /** |
| * Gets the key of the changed preference. |
| * |
| * @return the changed preference's key. |
| */ |
| public String getKey() { |
| return key; |
| } |
| |
| /** |
| * Gets the new value of the changed preference or {@code null} if the |
| * preference has been removed. |
| * |
| * @return the new value of the changed preference or {@code null} if the |
| * preference has been removed. |
| */ |
| public String getNewValue() { |
| return value; |
| } |
| |
| /** |
| * Gets the {@code Preferences} instance that fired this event. |
| * |
| * @return the {@code Preferences} instance that fired this event. |
| */ |
| public Preferences getNode() { |
| return node; |
| } |
| |
| /** |
| * This method always throws a <code>NotSerializableException</code>, |
| * because this object cannot be serialized, |
| */ |
| private void writeObject(ObjectOutputStream out) throws IOException { |
| throw new NotSerializableException(); |
| } |
| |
| /** |
| * This method always throws a <code>NotSerializableException</code>, |
| * because this object cannot be serialized, |
| */ |
| private void readObject(ObjectInputStream in) throws IOException{ |
| throw new NotSerializableException(); |
| } |
| } |