IndexOfComparator


1   /*
2    * Created on 07.03.2005
3    */
4   package com.tonbeller.wcf.utils;
5   
6   import java.util.Comparator  ;
7   import java.util.List  ;
8   
9   /**
10   * comparator to sort a list in the order of another list. Missing elements are placed
11   * at the end.
12   * 
13   * @author av
14   * @since 07.03.2005
15   */
16  public class IndexOfComparator implements Comparator   {
17  
18    List   list;
19  
20    public IndexOfComparator(List   list) {
21      this.list = list;
22    }
23  
24    public int compare(Object   o1, Object   o2) {
25      int i1 = list.indexOf(o1);
26      int i2 = list.indexOf(o2);
27      if (i1 < 0 && i2 < 0)
28        return 0;
29      if (i1 < 0)
30        return 1;
31      if (i2 < 0)
32        return -1;
33      if (i1 > i2)
34        return 1;
35      if (i1 < i2)
36        return -1;
37      return 0;
38    }
39  }
40

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