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PermutationCG.java
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PermutationCG.java
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/*
* Copyright (C) 2015, 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.util.PermutationGenerator;
import gov.nasa.jpf.vm.ChoiceGeneratorBase;
/**
* a CG that creates permutation choices
*
* since PermutationCGs have a potentially huge number of choices, we don't
* compute and store them upfront, but rather keep the enumeration state in a
* low level pull-based generator
*/
public class PermutationCG extends ChoiceGeneratorBase<int[]>{
protected PermutationGenerator pg;
protected int[] permutation;
public PermutationCG (PermutationGenerator pg){
this.pg = pg;
}
public PermutationCG (String id, PermutationGenerator pg){
super(id);
this.pg = pg;
}
@Override
public int[] getNextChoice() {
return permutation;
}
@Override
public Class<int[]> getChoiceType() {
return int[].class;
}
@Override
public boolean hasMoreChoices() {
return pg.hasNext();
}
@Override
public void advance() {
permutation = pg.next();
}
@Override
public void reset() {
pg.reset();
}
@Override
public int getTotalNumberOfChoices() {
return (int) pg.getNumberOfPermutations();
}
@Override
public int getProcessedNumberOfChoices() {
return (int) pg.getNumberOfGeneratedPermutations();
}
}