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Common subproject in the Theta model checking framework

There is a newer version: 6.5.2

/*
 *  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.common.visualization;

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

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

/**
 * Represents a compisite node of the visualizable graph.
 */
public final class CompositeNode extends Node {

    private final Collection children;

    CompositeNode(final String id, final NodeAttributes attributes) {
        super(id, attributes);
        this.children = new ArrayList();
    }

    void addChild(final Node child) {
        checkNotNull(child);
        checkArgument(child != this);
        checkArgument(child.getParent() == null);

        children.add(child);
        child.setParent(this);
    }

    public Collection getChildren() {
        return Collections.unmodifiableCollection(children);
    }
}