org.btrplace.safeplace.spec.prop.NEq Maven / Gradle / Ivy

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/*
 * Copyright (c) 2016 University Nice Sophia Antipolis
 *
 * This file is part of btrplace.
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see .
 */

package org.btrplace.safeplace.spec.prop;

import org.btrplace.safeplace.spec.term.Term;
import org.btrplace.safeplace.testing.verification.spec.Context;

/**
 * @author Fabien Hermenier
 */
public class NEq extends AtomicProp {

    public NEq(Term a, Term b) {
        super(a, b, "/=");
    }

    @Override
    public AtomicProp not() {
        return new Eq(a, b);
    }

    @Override
    public Boolean eval(Context mo) {
        Object vA = a.eval(mo);
        Object vB = b.eval(mo);
        if ((vA == null && vB != null) || (vA != null && vB == null)) {
            return true;
        }
        return vA != null && !vA.equals(vB);
    }
}