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   *  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
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   *    https://www.apache.org/licenses/LICENSE-2.0
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  package org.apache.cayenne.graph;
  
  import org.apache.cayenne.util.Util;
  
  /**
   * @since 1.2
   */
  public class NodePropertyChangeOperation extends NodeDiff {
  
  	private static final long serialVersionUID = 3282063727025159961L;
  
  	protected String property;
  	protected Object oldValue;
  	protected Object newValue;
  
  	public NodePropertyChangeOperation(Object nodeId, String property, Object oldValue, Object newValue) {
  
  		super(nodeId);
  		this.property = property;
  		this.oldValue = oldValue;
  		this.newValue = newValue;
  	}
  
  	public NodePropertyChangeOperation(Object nodeId, String property, Object oldValue, Object newValue, int diffId) {
  		super(nodeId, diffId);
  
  		this.property = property;
  		this.oldValue = oldValue;
  		this.newValue = newValue;
  	}
  
  	/**
  	 * @since 3.0
  	 */
  	public String getProperty() {
  		return property;
  	}
  
  	/**
  	 * Changes the 'newValue'.
  	 * 
  	 * @since 3.0
  	 */
  	void setNewValue(Object newValue) {
  		this.newValue = newValue;
  	}
  
  	/**
  	 * Returns true if both old and new value are equal.
  	 */
  	@Override
  	public boolean isNoop() {
  		return Util.nullSafeEquals(oldValue, newValue);
  	}
  
  	@Override
  	public void apply(GraphChangeHandler tracker) {
  		tracker.nodePropertyChanged(nodeId, property, oldValue, newValue);
  	}
  
  	@Override
  	public void undo(GraphChangeHandler tracker) {
  		tracker.nodePropertyChanged(nodeId, property, newValue, oldValue);
  	}
  }
  