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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 com.google.common.collect.ImmutableList;
import hu.bme.mit.theta.common.Utils;
import hu.bme.mit.theta.core.type.Expr;
import hu.bme.mit.theta.core.type.Type;

import java.util.List;

import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.collect.Streams.zip;
import static hu.bme.mit.theta.xta.Sync.Kind.EMIT;
import static hu.bme.mit.theta.xta.Sync.Kind.RECV;

public final class Sync {

    private static final int HASH_SEED = 6547;

    private volatile int hashCode = 0;

    public enum Kind {
        EMIT, RECV
    }

    private final Label label;
    private final List> args;
    private final Kind kind;

    private Sync(final Label label, final List> args, final Kind kind) {
        checkNotNull(label);
        checkNotNull(args);
        checkNotNull(kind);
        final List types = label.getParamTypes();
        checkArgument(args.size() == types.size());
        checkArgument(
                zip(args.stream(), types.stream(), (a, t) -> a.getType() == t).allMatch(p -> p));
        this.label = label;
        this.args = ImmutableList.copyOf(args);
        this.kind = kind;
    }

    public static Sync emit(final Label label, final List> args) {
        return new Sync(label, args, EMIT);
    }

    public static Sync recv(final Label label, final List> args) {
        return new Sync(label, args, RECV);
    }

    public Label getLabel() {
        return label;
    }

    public List> getArgs() {
        return args;
    }

    public Kind getKind() {
        return kind;
    }

    public boolean mayReceive(final Sync that) {
        checkArgument(that.kind.equals(EMIT));
        return this.label.equals(that.label) && this.kind.equals(RECV);
    }

    @Override
    public int hashCode() {
        int result = hashCode;
        if (result == 0) {
            result = HASH_SEED;
            result = 31 * result + label.hashCode();
            result = 31 * result + args.hashCode();
            result = 31 * result + kind.hashCode();
            hashCode = result;
        }
        return result;
    }

    @Override
    public boolean equals(final Object obj) {
        if (this == obj) {
            return true;
        } else if (obj != null && this.getClass() == obj.getClass()) {
            final Sync that = (Sync) obj;
            return this.label.equals(that.label) && this.kind.equals(that.kind) && this.args.equals(
                    that.args);
        } else {
            return false;
        }
    }

    @Override
    public String toString() {
        return Utils.lispStringBuilder(label.getName()).add(kind == EMIT ? "!" : "?").addAll(args)
                .toString();
    }

}