//
// Copyright (C) 2005 United States Government as represented by the
// Administrator of the National Aeronautics and Space Administration
// (NASA). All Rights Reserved.
//
// This software is distributed under the NASA Open Source Agreement
// (NOSA), version 1.3. The NOSA has been approved by the Open Source
// Initiative. See the file NOSA-1.3-JPF at the top of the distribution
// directory tree for the complete NOSA document.
//
// THE SUBJECT SOFTWARE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY OF ANY
// KIND, EITHER EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING, BUT NOT
// LIMITED TO, ANY WARRANTY THAT THE SUBJECT SOFTWARE WILL CONFORM TO
// SPECIFICATIONS, ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR
// A PARTICULAR PURPOSE, OR FREEDOM FROM INFRINGEMENT, ANY WARRANTY THAT
// THE SUBJECT SOFTWARE WILL BE ERROR FREE, OR ANY WARRANTY THAT
// DOCUMENTATION, IF PROVIDED, WILL CONFORM TO THE SUBJECT SOFTWARE.
//
package gov.nasa.jpf.vm.choice;
import java.util.ArrayList;
import gov.nasa.jpf.Config;
import gov.nasa.jpf.vm.ChoiceGeneratorBase;
import gov.nasa.jpf.vm.ClassInfo;
import gov.nasa.jpf.vm.ElementInfo;
import gov.nasa.jpf.vm.Heap;
import gov.nasa.jpf.vm.ReferenceChoiceGenerator;
import gov.nasa.jpf.vm.VM;
/**
* a choice generator that enumerates the set of all objects of a certain type. This
* is a replacement for the old 'Verify.randomObject'
*/
public class TypedObjectChoice extends ChoiceGeneratorBase<Integer> implements ReferenceChoiceGenerator {
// the requested object type
protected String type;
// the object references
protected int[] values;
// our enumeration state
protected int count;
public TypedObjectChoice (Config conf, String id) {
super(id);
Heap heap = VM.getVM().getHeap();
type = conf.getString(id + ".type");
if (type == null) {
throw conf.exception("missing 'type' property for TypedObjectChoice " + id);
}
ArrayList<ElementInfo> list = new ArrayList<ElementInfo>();
for ( ElementInfo ei : heap.liveObjects()) {
ClassInfo ci = ei.getClassInfo();
if (ci.isInstanceOf(type)) {
list.add(ei);
}
}
values = new int[list.size()];
int i = 0;
for ( ElementInfo ei : list) {
values[i++] = ei.getObjectRef();
}
count = -1;
}
@Override
public void advance () {
count++;
}
@Override
public int getProcessedNumberOfChoices () {
return count+1;
}
@Override
public int getTotalNumberOfChoices () {
return values.length;
}
@Override
public boolean hasMoreChoices () {
return !isDone && (count < values.length-1);
}
@Override
public void reset () {
count = -1;
isDone = false;
}
public Integer getNextChoice () {
if ((count >= 0) && (count < values.length)) {
return new Integer(values[count]);
} else {
return new Integer(-1);
}
}
public String toString() {
StringBuilder sb = new StringBuilder("TypedObjectChoice [id=");
sb.append(id);
sb.append(",type=");
sb.append(type);
sb.append(",values=");
for (int i=0; i< values.length; i++) {
if (i>0) {
sb.append(',');
}
if (i == count) {
sb.append("=>");
}
sb.append(values[i]);
}
sb.append(']');
return sb.toString();
}
public TypedObjectChoice randomize() {
for (int i = values.length - 1; i > 0; i--) {
int j = random.nextInt(i + 1);
int tmp = values[i];
values[i] = values[j];
values[j] = tmp;
}
return this;
}
@Override
public Class<Integer> getChoiceType() {
return Integer.class;
}
}