Mercurial > hg > Members > kono > jpf-core
view src/main/gov/nasa/jpf/vm/choice/RandomIntIntervalGenerator.java @ 3:fdc263e5806b
added inverse matching in StringSetMatcher. Since this is not easy to do in regexes, it's at the next hight level in StringSetMatcher
added a optional CG accessor interface (geChoice(i), getAllChoices(), getProcessedChoices() getUnprocessedChoices()) that can be used from listeners and peers to enumerate/analyse choice sets. Note that not all CGs have to support this as there is no requirement that CGs actually use pre-computed choice sets. The low level accessor is getChoice(i), ChoiceGeneratorBase provides generic (not very efficient) set accessor implementations. Note that ChoiceGeneratorBase.getChoice() has to be overridden in subclasses in order to support choice enumeration, the default impl is just there so that we don't break subclass compilation
author | Peter Mehlitz <Peter.C.Mehlitz@nasa.gov> |
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date | Tue, 03 Feb 2015 08:49:33 -0800 |
parents | 61d41facf527 |
children |
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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.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 Integer getChoice (int idx){ if (idx >= 0 && idx < nChoices){ // Ok, this is really not efficient - use only for non-performance critical operations Random r = new Random(seed); int v=0; for (int i=0; i<idx; i++){ v = r.nextInt(range); } return v + min; } else { throw new IllegalArgumentException("choice index out of range: " + idx); } } @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; } }