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


1 //
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// Copyright (C) 2005 United States Government as represented by the
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// Administrator of the National Aeronautics and Space Administration
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// (NASA). All Rights Reserved.
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//
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// This software is distributed under the NASA Open Source Agreement
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// (NOSA), version 1.3. The NOSA has been approved by the Open Source
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// Initiative. See the file NOSA-1.3-JPF at the top of the distribution
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// directory tree for the complete NOSA document.
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//
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// THE SUBJECT SOFTWARE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY OF ANY
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// KIND, EITHER EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING, BUT NOT
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// LIMITED TO, ANY WARRANTY THAT THE SUBJECT SOFTWARE WILL CONFORM TO
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// SPECIFICATIONS, ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR
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// A PARTICULAR PURPOSE, OR FREEDOM FROM INFRINGEMENT, ANY WARRANTY THAT
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// THE SUBJECT SOFTWARE WILL BE ERROR FREE, OR ANY WARRANTY THAT
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// DOCUMENTATION, IF PROVIDED, WILL CONFORM TO THE SUBJECT SOFTWARE.
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//
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package gov.nasa.jpf.search.heuristic;
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21 import gov.nasa.jpf.VM;
22
23
24 /**
25  * heuristic state prioritizer that favors search depth
26  */

27 public class DFSHeuristic implements Heuristic {
28   VM vm;
29   HeuristicSearch hSearch;
30
31   public DFSHeuristic (HeuristicSearch hs) {
32     hSearch = hs;
33     vm = hSearch.getVM();
34   }
35
36   public int heuristicValue () {
37     // <2do> pcm - is that correct if the search depth is not limited (-1) ?
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return hSearch.getDepthLimit() - vm.getPathLength();
39   }
40
41   public void processParent () {
42   }
43 }
44
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