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Java > Open Source Codes > gov > nasa > jpf > search > heuristic > HashcodeComparator


1 //
2 // Copyright (C) 2005 United States Government as represented by the
3 // Administrator of the National Aeronautics and Space Administration
4 // (NASA). All Rights Reserved.
5 //
6 // This software is distributed under the NASA Open Source Agreement
7 // (NOSA), version 1.3. The NOSA has been approved by the Open Source
8 // Initiative. See the file NOSA-1.3-JPF at the top of the distribution
9 // directory tree for the complete NOSA document.
10 //
11 // THE SUBJECT SOFTWARE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY OF ANY
12 // KIND, EITHER EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING, BUT NOT
13 // LIMITED TO, ANY WARRANTY THAT THE SUBJECT SOFTWARE WILL CONFORM TO
14 // SPECIFICATIONS, ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR
15 // A PARTICULAR PURPOSE, OR FREEDOM FROM INFRINGEMENT, ANY WARRANTY THAT
16 // THE SUBJECT SOFTWARE WILL BE ERROR FREE, OR ANY WARRANTY THAT
17 // DOCUMENTATION, IF PROVIDED, WILL CONFORM TO THE SUBJECT SOFTWARE.
18 //
19 package gov.nasa.jpf.search.heuristic;
20
21 import java.util.Comparator JavaDoc;
22
23
24 /**
25  * hashcode comparator for heuristic state ordering
26  */
27 public class HashcodeComparator implements Comparator JavaDoc {
28
29   public int compare (Object JavaDoc o1, Object JavaDoc o2) {
30     HeuristicState hs1 = (HeuristicState) o1;
31     HeuristicState hs2 = (HeuristicState) o2;
32     
33     int p1 = hs1.getPriority();
34     int p2 = hs2.getPriority();
35
36     if (p1 == p2) {
37       int h1 = hs1.hashCode();
38       int h2 = hs2.hashCode();
39
40       if (h1 == h2) {
41         return 0;
42       } else if (h1 < h2) {
43         return -1;
44       } else {
45         return 1;
46       }
47     } else if (p1 < p2) {
48       return -1;
49     } else {
50       return 1;
51     }
52   }
53 }
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