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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.channeling.nodes;
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.solver.variables.BoolVar;
import org.chocosolver.solver.variables.Variable;
import org.chocosolver.solver.variables.events.IntEventType;
import org.chocosolver.util.ESat;
import org.chocosolver.util.procedure.IntProcedure;
import org.chocosolver.util.tools.ArrayUtils;
/**
* Channeling between a graph variable and set variables
* representing either node neighbors or node successors
*
* @author Jean-Guillaume Fages
*/
public class PropNodeBoolsChannel extends Propagator {
//***********************************************************************************
// VARIABLES
//***********************************************************************************
private BoolVar[] bools;
private IGraphVar g;
private IGraphDeltaMonitor gdm;
private IntProcedure remG, forceG;
//***********************************************************************************
// CONSTRUCTORS
//***********************************************************************************
public PropNodeBoolsChannel(BoolVar[] vertices, IGraphVar gV) {
super(ArrayUtils.append(vertices,new Variable[]{gV}), PropagatorPriority.LINEAR, true);
this.bools = vertices;
this.g = gV;
gdm = g.monitorDelta(this);
forceG = element -> bools[element].setToTrue(this);
remG = element -> bools[element].setToFalse(this);
super.linkVariables();
}
//***********************************************************************************
// METHODS
//***********************************************************************************
@Override
public int getPropagationConditions(int vIdx) {
if (vIdx == bools.length) {
return GraphEventType.ADD_NODE.getMask() + GraphEventType.REMOVE_NODE.getMask();
}else{
return IntEventType.all();
}
}
@Override
public void propagate(int evtmask) throws ContradictionException {
for(int i=0;i