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OpenL Constraint Programming engine

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package org.openl.ie.constrainer;

///////////////////////////////////////////////////////////////////////////////
/*
 * Copyright Exigen Group 1998, 1999, 2000
 * 320 Amboy Ave., Metuchen, NJ, 08840, USA, www.exigengroup.com
 *
 * The copyright to the computer program(s) herein
 * is the property of Exigen Group, USA. All rights reserved.
 * The program(s) may be used and/or copied only with
 * the written permission of Exigen Group
 * or in accordance with the terms and conditions
 * stipulated in the agreement/contract under which
 * the program(s) have been supplied.
 */
///////////////////////////////////////////////////////////////////////////////
/**
 * An implementation of the trivial constraint for which its actual meaning "true" or "false" is known during the
 * construction.
 */
public final class ConstraintConst extends ConstraintImpl {
    private final boolean _flag;

    /**
     * Constructs the constraint.
     *
     * @param flag the boolean value for this constraint known during the construction.
     */
    public ConstraintConst(Constrainer c, boolean flag) {
        super(c, "Const");
        _flag = flag;
    }

    @Override
    public Goal execute() throws Failure {
        if (!_flag) {
            constrainer().fail("Const");
        }
        return null;
    }

    @Override
    public String toString() {
        return _flag ? "TRUE" : "FALSE";
    }
}