diff src/main/gov/nasa/jpf/vm/choice/RandomIntIntervalGenerator.java @ 0:61d41facf527

initial v8 import (history reset)
author Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
date Fri, 23 Jan 2015 10:14:01 -0800
parents
children fdc263e5806b
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/main/gov/nasa/jpf/vm/choice/RandomIntIntervalGenerator.java	Fri Jan 23 10:14:01 2015 -0800
@@ -0,0 +1,145 @@
+/*
+ * 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.ChoiceGenerator;
+import gov.nasa.jpf.vm.ChoiceGeneratorBase;
+import gov.nasa.jpf.vm.IntChoiceGenerator;
+
+import java.util.Random;
+
+/**
+ * a IntChoiceGenerator that randomly chooses a configured number
+ * of values from a specified range
+ * this is usually configured through app properties
+ * 
+ * <2do> this is too redundant to RandomOrderIntCG - replace
+ */
+public class RandomIntIntervalGenerator extends ChoiceGeneratorBase<Integer> implements IntChoiceGenerator {
+
+  protected int min, max; // both inclusive
+  protected int nChoices;
+  protected long seed;
+
+  protected Random random;
+  protected int range;
+
+  protected int next;
+  protected int count = 0;
+
+  public RandomIntIntervalGenerator (String id, int min, int max, int nChoices){
+    this(id, min,max,nChoices,0L);
+  }
+
+  public RandomIntIntervalGenerator (String id, int min, int max, int nChoices, long seed){
+    super(id);
+
+    this.min = min;
+    this.max = max;
+    this.nChoices = nChoices;
+    this.seed = seed;
+
+    range = max - min;
+    random = new Random(seed);
+  }
+
+  public RandomIntIntervalGenerator(Config conf, String id) {
+    super(id);
+
+    min = conf.getInt(id + ".min");
+    max = conf.getInt(id + ".max");
+    nChoices = conf.getInt(id + ".n", 1);
+    seed = conf.getLong(id + ".seed", 1);
+
+    range = max - min;
+    random = new Random(seed);
+  }
+
+
+  @Override
+  public void reset () {
+    random = new Random(seed);
+    count = 0;
+
+    isDone = false;
+  }
+
+	@Override
+	public boolean hasMoreChoices() {
+    return !isDone && (count < nChoices);
+	}
+
+  @Override
+  public void advance (){
+    if (count < nChoices){
+      count++;
+      next = random.nextInt(range) + min;
+    }
+  }
+
+  @Override
+  public Integer getNextChoice () {
+    return new Integer(next);
+  }
+
+  @Override
+  public int getTotalNumberOfChoices () {
+    return nChoices;
+  }
+
+  @Override
+  public int getProcessedNumberOfChoices () {
+    return count;
+  }
+
+  @Override
+  public String toString () {
+    StringBuilder sb = new StringBuilder(getClass().getName());
+    if (id == null) {
+      sb.append('[');
+    } else {
+      sb.append("[id=\"");
+      sb.append(id);
+      sb.append("\",");
+    }
+    sb.append(min);
+    sb.append("..");
+    sb.append(max);
+    sb.append(",n=");
+    sb.append(nChoices);
+    sb.append(",cur=");
+    sb.append(getNextChoice());
+    sb.append(",count=");
+    sb.append(count);
+    sb.append(']');
+    return sb.toString();
+  }
+
+  @Override
+  public Class<Integer> getChoiceType() {
+    return Integer.class;
+  }
+
+  @Override
+  public ChoiceGenerator<Integer> randomize() {
+    return this;
+  }
+
+}