/*
 * Copyright (c) 2007 BUSINESS OBJECTS SOFTWARE LIMITED
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 *     * Redistributions of source code must retain the above copyright notice,
 *       this list of conditions and the following disclaimer.
 *  
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *  
 *     * Neither the name of Business Objects nor the names of its contributors
 *       may be used to endorse or promote products derived from this software
 *       without specific prior written permission.
 *  
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */


/*
 * ValueGemChangeEvent.java
 * Creation date: Mar. 31st 2003
 * By: Ken C wong
 */
package org.openquark.gems.client;

import java.util.EventObject;

import org.openquark.cal.valuenode.ValueNode;


/**
 * Event object that describes the fact that ValueNode in this ValueGem has changed
 * @author Ken Wong
 * Creation Date: Mar. 31st 2003 
 */
public class ValueGemChangeEvent extends EventObject {
     
    private static final long serialVersionUID = -6215732818797837369L;
    private final ValueNode oldValue;
    private final ValueNode newValue;
    
    /**
     * Default constructor for this ValueNodeChangeEvent object 
     * @param valueGem
     * @param oldValue
     * @param newValue
     */
    ValueGemChangeEvent(ValueGem valueGem, ValueNode oldValue, ValueNode newValue) {
        super(valueGem); 
        this.oldValue = oldValue;
        this.newValue = newValue;
    }
    
    /**
     * Returns the Value that this gem had before this ValueNodeChange happened
     * @return ValueNode 
     */
    ValueNode getOldValue() {
        return oldValue;
    }
    
    /**
     * Returns the Value that this gem had after this ValueNodeChange happened
     * @return ValueNode 
     */
    ValueNode getNewValue() {
        return newValue;
    }
}