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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
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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;
}
}