/*
    * Copyright 2001-2008 The Apache Software Foundation.
    * 
    * 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.apache.juddi.query.util;
  
  import java.io.Serializable;
  import java.util.Comparator;
  import org.uddi.api_v3.KeyedReference;
  
  /**
   * @author <a href="mailto:jfaath@apache.org">Jeff Faath</a>
   */
  public class KeyedRefTModelComparator implements Comparator<KeyedReference>, Serializable {
      private static final long serialVersionUID = 1L;
  
  	public int compare(KeyedReference kr1, KeyedReference kr2) {
  		if (kr1 == null && kr2 == null)
  			return 0;
  		if (kr1 == null)
  			return -1;
  		if (kr2 == null)
  			return 1;
  		
  		if (kr1.getTModelKey() == null && kr2.getTModelKey() == null)
  			return 0;
  		if (kr1.getTModelKey() == null)
  			return -1;
  		if (kr2.getTModelKey() == null)
  			return 1;
  			
  		return kr1.getTModelKey().compareTo(kr2.getTModelKey());
  	}
  	
  }