ReverseComparator


1   package org.incava.util;
2   
3   import java.util.Comparator  ;
4   
5   
6   /**
7    * A comparator for reversed order.
8    */
9   public class ReverseComparator implements Comparator  
10  {
11      /**
12       * Compares o2 to o1. <code>o2</code> must implement Comparable.
13       */
14      public int compare(Object   o1, Object   o2)
15      {
16          if (o2 instanceof Comparable  ) {
17              Comparable   c2 = (Comparable  )o2;
18              return c2.compareTo(o1);
19          }
20          else {
21              throw new IllegalArgumentException  ("argument " + o2.getClass() + " does not implement Comparable");
22          }
23      }
24      
25      /**
26       * Returns <code>o1.equals(o2)</code>.
27       */
28      public boolean equals(Object   o1, Object   o2) 
29      {
30          return o1.equals(o2);
31      }
32  }
33

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