jdk/src/share/classes/java/util/prefs/NodeChangeEvent.java
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/*
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 * Copyright 2000-2003 Sun Microsystems, Inc.  All Rights Reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.  Sun designates this
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 * particular file as subject to the "Classpath" exception as provided
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 * by Sun in the LICENSE file that accompanied this code.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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 * CA 95054 USA or visit www.sun.com if you need additional information or
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 * have any questions.
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 */
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package java.util.prefs;
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import java.io.NotSerializableException;
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/**
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 * An event emitted by a <tt>Preferences</tt> node to indicate that
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 * a child of that node has been added or removed.<p>
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 *
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 * Note, that although NodeChangeEvent inherits Serializable interface from
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 * java.util.EventObject, it is not intended to be Serializable. Appropriate
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 * serialization methods are implemented to throw NotSerializableException.
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 *
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 * @author  Josh Bloch
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 * @see     Preferences
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 * @see     NodeChangeListener
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 * @see     PreferenceChangeEvent
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 * @since   1.4
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 * @serial  exclude
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 */
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public class NodeChangeEvent extends java.util.EventObject {
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    /**
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     * The node that was added or removed.
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     *
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     * @serial
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     */
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    private Preferences child;
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    /**
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     * Constructs a new <code>NodeChangeEvent</code> instance.
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     *
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     * @param parent  The parent of the node that was added or removed.
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     * @param child   The node that was added or removed.
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     */
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    public NodeChangeEvent(Preferences parent, Preferences child) {
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        super(parent);
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        this.child = child;
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    }
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    /**
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     * Returns the parent of the node that was added or removed.
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     *
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     * @return  The parent Preferences node whose child was added or removed
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     */
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    public Preferences getParent() {
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        return (Preferences) getSource();
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    }
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    /**
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     * Returns the node that was added or removed.
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     *
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     * @return  The node that was added or removed.
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     */
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    public Preferences getChild() {
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        return child;
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    }
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    /**
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     * Throws NotSerializableException, since NodeChangeEvent objects are not
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     * intended to be serializable.
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     */
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     private void writeObject(java.io.ObjectOutputStream out)
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                                               throws NotSerializableException {
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         throw new NotSerializableException("Not serializable.");
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     }
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    /**
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     * Throws NotSerializableException, since NodeChangeEvent objects are not
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     * intended to be serializable.
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     */
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     private void readObject(java.io.ObjectInputStream in)
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                                               throws NotSerializableException {
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         throw new NotSerializableException("Not serializable.");
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     }
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    // Defined so that this class isn't flagged as a potential problem when
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    // searches for missing serialVersionUID fields are done.
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    private static final long serialVersionUID = 8068949086596572957L;
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}