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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.constraints.nary.alldifferent;

import org.chocosolver.solver.constraints.Propagator;
import org.chocosolver.solver.constraints.PropagatorPriority;
import org.chocosolver.solver.constraints.nary.alldifferent.algo.AlgoAllDiffBC;
import org.chocosolver.solver.exception.ContradictionException;
import org.chocosolver.solver.explanations.RuleStore;
import org.chocosolver.solver.variables.IntVar;
import org.chocosolver.solver.variables.events.IEventType;
import org.chocosolver.solver.variables.events.IntEventType;
import org.chocosolver.util.ESat;

/**
 * Based on: 
* "A Fast and Simple Algorithm for Bounds Consistency of the AllDifferent Constraint"
* A. Lopez-Ortiz, CG. Quimper, J. Tromp, P.van Beek *
* * @author Hadrien Cambazard, Charles Prud'homme, Jean-Guillaume fages * @since 07/02/11 *

*/ public class PropAllDiffBC extends Propagator { private AlgoAllDiffBC filter; public PropAllDiffBC(IntVar[] variables) { super(variables, PropagatorPriority.LINEAR, false); filter = new AlgoAllDiffBC(this); filter.reset(vars); } @Override public int getPropagationConditions(int vIdx) { return IntEventType.boundAndInst(); } @Override public void propagate(int evtmask) throws ContradictionException { filter.filter(); } @Override public ESat isEntailed() { return ESat.TRUE; // redundant propagator (use PropAllDiffInst) } @Override public boolean why(RuleStore ruleStore, IntVar var, IEventType evt, int value) { boolean nrules = ruleStore.addPropagatorActivationRule(this); for (int i = 0; i < vars.length; i++) { if(vars[i]!=var){ nrules |= ruleStore.addBoundsRule(vars[i]); } } return nrules; } }





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