/*
 * Copyright 2022 Red Hat, Inc. and/or its affiliates.
 *
 * 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 org.kie.kogito.internal.process.event;

import java.util.Collection;
import java.util.Objects;

public interface KogitoObjectListenerAware {

    default void fireEvent(String propertyName, Object oldValue, Object newValue, Runnable updater) {
        if (!Objects.equals(oldValue, newValue)) {
            if (newValue instanceof KogitoObjectListenerAware && !Objects.equals(this, newValue)) {
                ((KogitoObjectListenerAware) newValue).addKogitoObjectListener(new KogitoObjectListenerAwareListener(this, propertyName));
            }
            listeners().forEach(l -> l.beforeValueChanged(this, propertyName, oldValue, newValue));
            updater.run();
            listeners().forEach(l -> l.afterValueChanged(this, propertyName, oldValue, newValue));
        }
    }

    void addKogitoObjectListener(KogitoObjectListener listener);

    Collection<KogitoObjectListener> listeners();

    boolean isEmpty();
}
