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

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

import hu.bme.mit.theta.analysis.Action;
import hu.bme.mit.theta.analysis.TransFunc;
import hu.bme.mit.theta.analysis.expl.ExplState;
import hu.bme.mit.theta.analysis.unit.UnitPrec;

final class ItpExplTransFunc implements TransFunc {

    private final TransFunc transFunc;

    public ItpExplTransFunc(final TransFunc transFunc) {
        this.transFunc = checkNotNull(transFunc);
    }

    public static final  ItpExplTransFunc create(
            final TransFunc transFunc) {
        return new ItpExplTransFunc<>(transFunc);
    }

    @Override
    public Collection getSuccStates(final ItpExplState state, final A action,
                                                  final UnitPrec prec) {
        checkNotNull(state);
        checkNotNull(action);
        checkNotNull(prec);

        final ExplState subState = state.getConcrState();
        final Collection subSuccStates = transFunc.getSuccStates(subState,
                action, prec);

        if (subSuccStates.isEmpty()) {
            final ItpExplState succState = ItpExplState.of(ExplState.bottom(), ExplState.top());
            return Collections.singleton(succState);
        } else {
            final Collection result = new ArrayList<>(subSuccStates.size());
            for (final ExplState subSuccState : subSuccStates) {
                final ItpExplState succState = ItpExplState.of(subSuccState, ExplState.top());
                result.add(succState);
            }
            return result;
        }
    }

}