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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.zone;

import static com.google.common.base.Preconditions.checkNotNull;

import java.util.Collection;
import java.util.Collections;

import hu.bme.mit.theta.analysis.InitFunc;
import hu.bme.mit.theta.analysis.zone.ZonePrec;
import hu.bme.mit.theta.analysis.zone.ZoneState;

final class XtaZoneInitFunc implements InitFunc {

    private static final XtaZoneInitFunc INSTANCE = new XtaZoneInitFunc();

    private XtaZoneInitFunc() {
    }

    static XtaZoneInitFunc getInstance() {
        return INSTANCE;
    }

    @Override
    public Collection getInitStates(final ZonePrec prec) {
        checkNotNull(prec);
        return Collections.singleton(ZoneState.zero(prec.getVars()).transform().up().build());
    }

}