/**
* 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 solver.constraints.set;
import gnu.trove.map.hash.THashMap;
import solver.Solver;
import solver.constraints.Propagator;
import solver.constraints.PropagatorPriority;
import solver.exception.ContradictionException;
import solver.variables.SetVar;
import solver.variables.delta.ISetDeltaMonitor;
import solver.variables.events.SetEventType;
import util.ESat;
import util.procedure.IntProcedure;
/**
* set2 is an offSet view of set1
* x in set1 <=> x+offSet in set2
*
* @author Jean-Guillaume Fages
*/
public class PropOffSet extends Propagator<SetVar> {
private int offSet, tmp;
private SetVar tmpSet;
private IntProcedure forced, removed;
private ISetDeltaMonitor[] sdm;
//***********************************************************************************
// CONSTRUCTORS
//***********************************************************************************
/**
* set2 is an offSet view of set1
* x in set1 <=> x+offSet in set2
*/
public PropOffSet(SetVar set1, SetVar set2, int offSet) {
super(new SetVar[]{set1, set2}, PropagatorPriority.UNARY, true);
this.offSet = offSet;
sdm = new ISetDeltaMonitor[2];
sdm[0] = vars[0].monitorDelta(this);
sdm[1] = vars[1].monitorDelta(this);
this.forced = new IntProcedure() {
@Override
public void execute(int i) throws ContradictionException {
tmpSet.addToKernel(i + tmp, aCause);
}
};
this.removed = new IntProcedure() {
@Override
public void execute(int i) throws ContradictionException {
tmpSet.removeFromEnvelope(i + tmp, aCause);
}
};
}
//***********************************************************************************
// METHODS
//***********************************************************************************
@Override
public void propagate(int evtmask) throws ContradictionException {
// kernel
for (int j = vars[0].getKernelFirst(); j != SetVar.END; j = vars[0].getKernelNext()) {
vars[1].addToKernel(j + offSet, aCause);
}
for (int j = vars[1].getKernelFirst(); j != SetVar.END; j = vars[1].getKernelNext()) {
vars[0].addToKernel(j - offSet, aCause);
}
// envelope
for (int j = vars[0].getEnvelopeFirst(); j != SetVar.END; j = vars[0].getEnvelopeNext()) {
if (!vars[1].envelopeContains(j + offSet)) {
vars[0].removeFromEnvelope(j, aCause);
}
}
for (int j = vars[1].getEnvelopeFirst(); j != SetVar.END; j = vars[1].getEnvelopeNext()) {
if (!vars[0].envelopeContains(j - offSet)) {
vars[1].removeFromEnvelope(j, aCause);
}
}
sdm[0].unfreeze();
sdm[1].unfreeze();
}
@Override
public void propagate(int v, int mask) throws ContradictionException {
sdm[v].freeze();
if (v == 0) {
tmp = offSet;
tmpSet = vars[1];
} else {
tmp = -offSet;
tmpSet = vars[0];
}
sdm[v].forEach(forced, SetEventType.ADD_TO_KER);
sdm[v].forEach(removed, SetEventType.REMOVE_FROM_ENVELOPE);
sdm[v].unfreeze();
}
@Override
public ESat isEntailed() {
for (int j = vars[0].getKernelFirst(); j != SetVar.END; j = vars[0].getKernelNext()) {
if (!vars[1].envelopeContains(j + offSet)) {
return ESat.FALSE;
}
}
for (int j = vars[1].getKernelFirst(); j != SetVar.END; j = vars[1].getKernelNext()) {
if (!vars[0].envelopeContains(j - offSet)) {
return ESat.FALSE;
}
}
if (isCompletelyInstantiated()) {
return ESat.TRUE;
}
return ESat.UNDEFINED;
}
@Override
public void duplicate(Solver solver, THashMap<Object, Object> identitymap) {
if (!identitymap.containsKey(this)) {
vars[0].duplicate(solver, identitymap);
SetVar s1 = (SetVar) identitymap.get(vars[0]);
vars[1].duplicate(solver, identitymap);
SetVar s2 = (SetVar) identitymap.get(vars[1]);
identitymap.put(this, new PropOffSet(s1, s2, offSet));
}
}
}