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Open-source constraint solver.
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/**
 * Copyright (c) 2016, Ecole des Mines de Nantes
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    This product includes software developed by the .
 * 4. Neither the name of the  nor the
 *    names of its contributors may be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY  ''AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL  BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
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;
    }
}