NumberComparator


1   package org.displaytag.test;
2   
3   import java.util.Comparator  ;
4   
5   import org.apache.commons.beanutils.ConvertUtils;
6   
7   
8   /**
9    * Sorts 2 numbers, converted from objects using beanutils Converters.
10   * @author rapruitt
11   * @author Fabrizio Giustina
12   * @version $Revision$ ($Author$)
13   */
14  public class NumberComparator implements Comparator  
15  {
16  
17      /**
18       * @see Comparator#compare(Object, Object)
19       */
20      public int compare(Object   obj1, Object   obj2)
21      {
22          double dbl1 = 0;
23          if (obj1 instanceof Number  )
24          {
25              dbl1 = ((Number  ) obj1).doubleValue();
26          }
27          else if (obj1 != null)
28          {
29              dbl1 = ((Number  ) ConvertUtils.convert(obj1.toString(), Number  .class)).doubleValue();
30          }
31  
32          double dbl2 = 0;
33          if (obj2 instanceof Number  )
34          {
35              dbl2 = ((Number  ) obj2).doubleValue();
36          }
37          else if (obj1 != null)
38          {
39              dbl2 = ((Number  ) ConvertUtils.convert(obj2.toString(), Number  .class)).doubleValue();
40          }
41  
42          return new Double  (dbl1).compareTo(new Double  (dbl2));
43      }
44  }
45

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