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Xta 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;

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

import hu.bme.mit.theta.core.clock.op.ClockOp;
import hu.bme.mit.theta.core.clock.op.ClockOps;
import hu.bme.mit.theta.core.stmt.Stmt;

public abstract class Update {

    private Update() {
    }

    static DataUpdate dataUpdate(final Stmt stmt) {
        return new DataUpdate(stmt);
    }

    static ClockUpdate clockUpdate(final Stmt stmt) {
        return new ClockUpdate(ClockOps.fromStmt(stmt));
    }

    public abstract Stmt toStmt();

    public abstract boolean isDataUpdate();

    public abstract boolean isClockUpdate();

    public abstract DataUpdate asDataUpdate();

    public abstract ClockUpdate asClockUpdate();

    public static final class DataUpdate extends Update {

        private final Stmt stmt;

        private DataUpdate(final Stmt stmt) {
            this.stmt = checkNotNull(stmt);
        }

        @Override
        public Stmt toStmt() {
            return stmt;
        }

        @Override
        public boolean isDataUpdate() {
            return true;
        }

        @Override
        public boolean isClockUpdate() {
            return false;
        }

        @Override
        public DataUpdate asDataUpdate() {
            return this;
        }

        @Override
        public ClockUpdate asClockUpdate() {
            throw new ClassCastException();
        }

        @Override
        public String toString() {
            return stmt.toString();
        }

    }

    public static final class ClockUpdate extends Update {

        private final ClockOp clockOp;

        private ClockUpdate(final ClockOp clockOp) {
            this.clockOp = checkNotNull(clockOp);
        }

        public ClockOp getClockOp() {
            return clockOp;
        }

        @Override
        public Stmt toStmt() {
            return clockOp.toStmt();
        }

        @Override
        public boolean isDataUpdate() {
            return false;
        }

        @Override
        public boolean isClockUpdate() {
            return true;
        }

        @Override
        public DataUpdate asDataUpdate() {
            throw new ClassCastException();
        }

        @Override
        public ClockUpdate asClockUpdate() {
            return this;
        }

        @Override
        public String toString() {
            return clockOp.toString();
        }

    }

}