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/*
 * Copyright (c) 1999-2012, Ecole des Mines de Nantes
 * All rights reserved.
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 *       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
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package org.chocosolver.parser.flatzinc.ast.expression;

import org.chocosolver.solver.Solver;
import org.chocosolver.solver.variables.BoolVar;
import org.chocosolver.solver.variables.IntVar;
import org.chocosolver.solver.variables.VariableFactory;

/*
* User : CPRUDHOM
* Mail : cprudhom(a)emn.fr
* Date : 11 janv. 2010
* Since : Choco 2.1.1
*
* Class for boolean expressions definition based on flatzinc-like objects.
*/
public final class EBool extends Expression {

    public final boolean value;

    public static final EBool instanceTrue = new EBool(true);
    public static final EBool instanceFalse = new EBool(false);

    public static EBool make(boolean value) {
        if (value) return instanceTrue;
        else return instanceFalse;
    }

    private EBool(boolean value) {
        super(EType.BOO);
        this.value = value;
    }

    @Override
    public String toString() {
        return String.valueOf(value);
    }

    @Override
    public int intValue() {
        return value ? 1 : 0;
    }

    @Override
    public int[] toIntArray() {
        return new int[]{intValue()};
    }

    @Override
    public boolean boolValue() {
        return value;
    }

    @Override
    public boolean[] toBoolArray() {
        return new boolean[]{boolValue()};
    }

    @Override
    public BoolVar boolVarValue(Solver solver) {
        return intValue() == 1? solver.ONE(): solver.ZERO();
    }

    @Override
    public BoolVar[] toBoolVarArray(Solver solver) {
        return new BoolVar[]{boolVarValue(solver)};
    }

    @Override
    public IntVar intVarValue(Solver solver) {
        return VariableFactory.fixed(intValue(), solver);
    }

    @Override
    public IntVar[] toIntVarArray(Solver solver) {
        return new IntVar[]{intVarValue(solver)};
    }

    @Override
    public int[][] toIntMatrix() {
        return new int[][]{{intValue()}};
    }
}