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Xta Analysis subproject in the Theta model checking framework

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/*
 *  Copyright 2024 Budapest University of Technology and Economics
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package hu.bme.mit.theta.xta.analysis.expl.itp;

import hu.bme.mit.theta.analysis.PartialOrd;

final class ItpExplOrd implements PartialOrd {

    private ItpExplOrd() {
    }

    private static final class LazyHolder {

        private static final ItpExplOrd INSTANCE = new ItpExplOrd();
    }

    public static ItpExplOrd getInstance() {
        return LazyHolder.INSTANCE;
    }

    @Override
    public boolean isLeq(final ItpExplState state1, final ItpExplState state2) {
        if (state1.isBottom()) {
            return true;
        } else if (state2.isBottom()) {
            return false;
        } else {
            return state1.getAbstrState().isLeq(state2.getAbstrState());
        }
    }

}