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Open-source constraint solver.
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/*
* This file is part of choco-solver, http://choco-solver.org/
*
* Copyright (c) 2024, IMT Atlantique. All rights reserved.
*
* Licensed under the BSD 4-clause license.
*
* See LICENSE file in the project root for full license information.
*/
package org.chocosolver.solver.variables.delta;
import org.chocosolver.memory.IEnvironment;
import org.chocosolver.solver.ICause;
import org.chocosolver.solver.search.loop.TimeStampedObject;
/**
*
*
* @author Charles Prud'homme
* @since 18 nov. 2010
*/
public final class OneValueDelta extends TimeStampedObject implements IEnumDelta {
private int value;
private ICause cause;
private boolean set;
public OneValueDelta(IEnvironment environment) {
super(environment);
}
@Override
public void lazyClear() {
if (needReset()) {
set = false;
resetStamp();
}
}
@Override
public void add(int value, ICause cause) {
lazyClear();
this.value = value;
this.cause = cause;
set = true;
}
@Override
public int get(int idx) {
if (idx < 1) {
return value;
} else {
throw new IndexOutOfBoundsException("OneValueDelta#get(): size must be checked before!");
}
}
@Override
public ICause getCause(int idx) {
if (idx < 1) {
return cause;
} else {
throw new IndexOutOfBoundsException("OneValueDelta#get(): size must be checked before!");
}
}
@Override
public int size() {
return set ? 1 : 0;
}
}