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* Copyright (c) 1999-2014, Ecole des Mines de Nantes
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*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY
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package solver.constraints.nary.nValue.amnv.rules;
import solver.constraints.Propagator;
import solver.constraints.nary.alldifferent.algo.AlgoAllDiffBC;
import solver.constraints.nary.nValue.amnv.mis.F;
import solver.exception.ContradictionException;
import solver.variables.IntVar;
import util.objects.graphs.UndirectedGraph;
import java.util.BitSet;
/**
* R4 filtering rule (AllDifferent propagation)
*
* @since 01/01/2014
* @author Jean-Guillaume Fages
*/
public class R4 implements R {
private AlgoAllDiffBC filter;
public void filter(IntVar[] vars, UndirectedGraph graph, F heur, Propagator aCause) throws ContradictionException{
int n = vars.length-1;
BitSet mis = heur.getMIS();
if(mis.cardinality()==vars[n].getUB()){
IntVar[] vs = new IntVar[mis.cardinality()];
int idx = 0;
for(int x=mis.nextSetBit(0);x>=0;x=mis.nextSetBit(x+1)){
vs[idx++] = vars[x];
}
if(filter==null)filter=new AlgoAllDiffBC(aCause);
filter.reset(vs);
filter.filter();
}
}
}