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A graph module for Choco Solver.
There is a newer version: 4.2.2
/**
 *  Copyright (c) 1999-2014, 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:
 *
 *      * Redistributions of source code must retain the above copyright
 *        notice, this list of conditions and the following disclaimer.
 *      * 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.
 *      * Neither the name of the Ecole des Mines de Nantes 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 THE REGENTS AND CONTRIBUTORS ``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 THE REGENTS AND CONTRIBUTORS 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.graphsolver.variables.delta;

import org.chocosolver.memory.IEnvironment;
import org.chocosolver.solver.ICause;
import org.chocosolver.solver.search.loop.TimeStampedObject;
import org.chocosolver.solver.variables.delta.EnumDelta;
import org.chocosolver.solver.variables.delta.IEnumDelta;

public class GraphDelta extends TimeStampedObject implements IGraphDelta {

    //***********************************************************************************
    // VARIABLES
    //***********************************************************************************

    private IEnumDelta[] deltaOfType;

    //***********************************************************************************
    // CONSTRUCTORS
    //***********************************************************************************

    public GraphDelta(IEnvironment environment) {
        super(environment);
        deltaOfType = new IEnumDelta[NB];
        for (int i = 0; i < NB; i++) {
            deltaOfType[i] = new EnumDelta(environment);
        }
    }

    //***********************************************************************************
    // METHODS
    //***********************************************************************************

    @Override
    public int getSize(int i) {
        return deltaOfType[i].size();
    }

    @Override
    public void add(int element, int type, ICause cause) {
		lazyClear();
        deltaOfType[type].add(element, cause);
    }

	@Override
    public void lazyClear() {
        if (needReset()) {
			for (int i = 0; i < NB; i++) {
				deltaOfType[i].lazyClear();
			}
			resetStamp();
		}
    }

    @Override
    public int get(int index, int type) {
        return deltaOfType[type].get(index);
    }

    @Override
    public ICause getCause(int index, int type) {
        return deltaOfType[type].getCause(index);
    }
}