--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/main/gov/nasa/jpf/vm/choice/DoubleThresholdGenerator.java	Fri Jan 23 10:14:01 2015 -0800
@@ -0,0 +1,114 @@
+/*
+ * 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.vm.choice;
+
+import gov.nasa.jpf.Config;
+import gov.nasa.jpf.vm.ChoiceGeneratorBase;
+import gov.nasa.jpf.vm.DoubleChoiceGenerator;
+
+/**
+ * ChoiceGenerator instance that produces a simple 3 value enumeration
+ * 
+ */
+public class DoubleThresholdGenerator extends ChoiceGeneratorBase<Double> implements DoubleChoiceGenerator {
+
+  protected double[] values = new double[3];
+  protected int count;
+
+  public DoubleThresholdGenerator(Config conf, String id) {
+    super(id);
+
+    values[0] = conf.getDouble(id + ".low");
+    values[1] = conf.getDouble(id + ".threshold");
+    values[2] = conf.getDouble(id + ".high");
+    count = -1;
+  }
+
+  @Override
+  public void reset () {
+    count = -1;
+
+    isDone = false;
+  }
+
+  @Override
+  public boolean hasMoreChoices () {
+    return !isDone && (count < 2);
+  }
+
+  @Override
+  public Double getNextChoice () {
+    if (count >=0) {
+      return new Double(values[count]);
+    } else {
+      return new Double(values[0]);
+    }
+  }
+
+  @Override
+  public void advance () {
+    if (count < 2)
+      count++;
+  }
+
+  @Override
+  public int getTotalNumberOfChoices () {
+    return 3;
+  }
+
+  @Override
+  public int getProcessedNumberOfChoices () {
+    return count + 1;
+  }
+
+  @Override
+  public String toString() {
+    StringBuilder sb = new StringBuilder(getClass().getName());
+    sb.append("[id=\"");
+    sb.append(id);
+    sb.append("\",");
+    
+    for (int i=0; i<3; i++) {
+      if (count == i) {
+        sb.append(MARKER);
+      }
+      sb.append(values[i]);
+      if (count < 2) {
+        sb.append(',');
+      }
+    }
+    sb.append(']');
+    return sb.toString();
+  }
+  
+  @Override
+  public DoubleThresholdGenerator randomize () {
+    for (int i = values.length - 1; i > 0; i--) {
+      int j = random.nextInt(i + 1);
+      double tmp = values[i];
+      values[i] = values[j];
+      values[j] = tmp;
+    }    
+    return this;
+  }
+
+  @Override
+  public Class<Double> getChoiceType() {
+    return Double.class;
+  }
+}