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A graph module for Choco Solver.
/**
* 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.cstrs.cycles;
import org.chocosolver.graphsolver.variables.GraphEventType;
import org.chocosolver.graphsolver.variables.IGraphVar;
import org.chocosolver.graphsolver.variables.delta.IGraphDeltaMonitor;
import org.chocosolver.solver.constraints.Propagator;
import org.chocosolver.solver.constraints.PropagatorPriority;
import org.chocosolver.solver.exception.ContradictionException;
import org.chocosolver.util.ESat;
import org.chocosolver.util.objects.setDataStructures.ISet;
import org.chocosolver.util.procedure.PairProcedure;
import java.util.BitSet;
/**
* Propagator for the no-cycle constraint (general case)
*
* @author Jean-Guillaume Fages
*/
public class PropACyclic extends Propagator {
//***********************************************************************************
// VARIABLES
//***********************************************************************************
private IGraphVar g;
private IGraphDeltaMonitor gdm;
private PairProcedure arcEnf;
private int n;
private BitSet rfFrom, rfTo;
private int[] fifo;
//***********************************************************************************
// CONSTRUCTORS
//***********************************************************************************
public PropACyclic(IGraphVar g){
super(new IGraphVar[]{g}, PropagatorPriority.LINEAR,true);
this.g = g;
this.n = g.getNbMaxNodes();
this.fifo = new int[n];
this.rfFrom = new BitSet(n);
this.rfTo = new BitSet(n);
this.gdm = g.monitorDelta(this);
this.arcEnf = this::propagateIJ;
}
//***********************************************************************************
// METHODS
//***********************************************************************************
@Override
public int getPropagationConditions(int idx){
return GraphEventType.ADD_ARC.getMask();
}
@Override
public void propagate(int evtmask) throws ContradictionException {
for(int i=0;i0) {
for(int j=0;j