ComparableComparator


1   /*
2    * Copyright 2002-2005 the original author or authors.
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  
17  package org.springframework.util.comparator;
18  
19  import java.util.Comparator  ;
20  
21  import org.springframework.util.Assert;
22  
23  /**
24   * Comparator that adapts Comparables to the Comparator interface.
25   * Mainly for internal use in other Comparators, when supposed
26   * to work on Comparables.
27   * 
28   * @author Keith Donald
29   * @since 1.2.2
30   * @see Comparable
31   */
32  public class ComparableComparator implements Comparator   {
33  
34      public int compare(Object   o1, Object   o2) {
35          Assert.isTrue(o1 instanceof Comparable  , "The first object provided is not Comparable");
36          Assert.isTrue(o2 instanceof Comparable  , "The second object provided is not Comparable");
37          return ((Comparable  ) o1).compareTo(o2);
38      }
39  
40  }
41

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