/*
    * Copyright (C) 2007-2012 Argeo GmbH
    *
    * Licensed 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 org.argeo.jcr;
  
  import javax.jcr.Value;
  
  /** The result of the comparison of two JCR properties. */
  public class PropertyDiff {
  	public final static Integer MODIFIED = 0;
  	public final static Integer ADDED = 1;
  	public final static Integer REMOVED = 2;
  
  	private final Integer type;
  	private final String relPath;
  	private final Value referenceValue;
  	private final Value newValue;
  
  	public PropertyDiff(Integer type, String relPath, Value referenceValue,
  			Value newValue) {
  		super();
  
  		if (type == MODIFIED) {
  			if (referenceValue == null || newValue == null)
  				throw new ArgeoJcrException(
  						"Reference and new values must be specified.");
  		} else if (type == ADDED) {
  			if (referenceValue != null || newValue == null)
  				throw new ArgeoJcrException(
  						"New value and only it must be specified.");
  		} else if (type == REMOVED) {
  			if (referenceValue == null || newValue != null)
  				throw new ArgeoJcrException(
  						"Reference value and only it must be specified.");
  		} else {
  			throw new ArgeoJcrException("Unkown diff type " + type);
  		}
  
  		if (relPath == null)
  			throw new ArgeoJcrException("Relative path must be specified");
  
  		this.type = type;
  		this.relPath = relPath;
  		this.referenceValue = referenceValue;
  		this.newValue = newValue;
  	}
  
  	public Integer getType() {
  		return type;
  	}
  
  	public String getRelPath() {
  		return relPath;
  	}
  
  	public Value getReferenceValue() {
  		return referenceValue;
  	}
  
  	public Value getNewValue() {
  		return newValue;
  	}
  
  }