Package solver.constraints.unary

Source Code of solver.constraints.unary.PropNotMemberEnum

/*
* 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;
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

package solver.constraints.unary;

import gnu.trove.iterator.TIntIterator;
import gnu.trove.map.hash.THashMap;
import gnu.trove.set.hash.TIntHashSet;
import solver.Solver;
import solver.constraints.Propagator;
import solver.constraints.PropagatorPriority;
import solver.exception.ContradictionException;
import solver.explanations.Deduction;
import solver.explanations.Explanation;
import solver.variables.IntVar;
import util.ESat;

import java.util.Arrays;

/**
* <br/>
*
* @author Charles Prud'homme
* @since 26 nov. 2010
*/
public class PropNotMemberEnum extends Propagator<IntVar> {

    final TIntHashSet values;

    public PropNotMemberEnum(IntVar var, int[] values) {
        super(new IntVar[]{var}, PropagatorPriority.UNARY, false);
        this.values = new TIntHashSet(values);
    }

    @Override
    public void propagate(int evtmask) throws ContradictionException {
        TIntIterator it = values.iterator();
        int left = Integer.MIN_VALUE;
        int right = left;
        boolean rall = true;
        for (; it.hasNext(); ) {
            int val = it.next();
            if (val == right + 1) {
                right = val;
            } else {
                if (left > Integer.MIN_VALUE) {
                    rall &= vars[0].removeInterval(left, right, aCause);
                }
                left = right = val;
            }
        }
        if (left > Integer.MIN_VALUE) {
            rall &= vars[0].removeInterval(left, right, aCause);
        }
        if (rall) {
            this.setPassive();
        }
    }

    @Override
    public void propagate(int varIdx, int mask) throws ContradictionException {
        propagate(0);
    }

    @Override
    public ESat isEntailed() {
        int ub = this.vars[0].getUB();
        int nb = 0;
        for (int val = this.vars[0].getLB(); val <= ub; val = this.vars[0].nextValue(val)) {
            if (!values.contains(val)) {
                nb++;
            }
        }
        if (nb == 0) return ESat.FALSE;
        else if (nb == vars[0].getDomainSize()) return ESat.TRUE;
        return ESat.UNDEFINED;
    }

    @Override
    public String toString() {
        return vars[0].getName() + " outside " + Arrays.toString(values.toArray());
    }

    @Override
    public void explain(Deduction d, Explanation e) {
        e.add(solver.getExplainer().getPropagatorActivation(this));
        e.add(aCause);
    }

    @Override
    public void duplicate(Solver solver, THashMap<Object, Object> identitymap) {
        if (!identitymap.containsKey(this)) {
            identitymap.put(this, new PropNotMemberEnum((IntVar) identitymap.get(vars[0]), values.toArray()));
        }
    }
}
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