Initial import

[jpf-core.git] / src / main / gov / nasa / jpf / search / heuristic / DFSHeuristic.java

diff --git a/src/main/gov/nasa/jpf/search/heuristic/DFSHeuristic.java b/src/main/gov/nasa/jpf/search/heuristic/DFSHeuristic.java
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+/*
+ * Copyright (C) 2014, United States Government, as represented by the
+ * Administrator of the National Aeronautics and Space Administration.
+ * All rights reserved.
+ *
+ * The Java Pathfinder core (jpf-core) platform is licensed under the
+ * Apache License, Version 2.0 (the "License"); you may not use this file except
+ * in compliance with the License. You may obtain a copy of the License at
+ * 
+ *        http://www.apache.org/licenses/LICENSE-2.0. 
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and 
+ * limitations under the License.
+ */
+package gov.nasa.jpf.search.heuristic;
+
+import gov.nasa.jpf.Config;
+import gov.nasa.jpf.vm.VM;
+
+
+/**
+ * heuristic state prioritizer that favors search depth
+ */
+public class DFSHeuristic extends SimplePriorityHeuristic {
+  
+  public DFSHeuristic (Config conf, VM vm) {
+    super(conf, vm);
+  }
+
+  @Override
+  protected int computeHeuristicValue () {
+    return Integer.MAX_VALUE - vm.getPathLength();
+  }
+}