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/*
 * Copyright 2017 ObjectBox Ltd. All rights reserved.
 *
 * 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 io.objectbox.reactive;

import java.util.Set;

import io.objectbox.annotation.apihint.Internal;

@Internal
public class DataPublisherUtils {
    /**
     * Observers may be wrapped by @{@link DelegatingObserver}, this will also remove those.
     */
    public static  void removeObserverFromCopyOnWriteSet(Set> observers, DataObserver observer) {
        if (observers != null) {
            for (DataObserver candidate : observers) {
                if (candidate.equals(observer)) {
                    // Unsupported by CopyOnWriteArraySet: iterator.remove();
                    observers.remove(candidate);
                } else if (candidate instanceof DelegatingObserver) {
                    DataObserver delegate = candidate;
                    while (delegate instanceof DelegatingObserver) {
                        delegate = ((DelegatingObserver) delegate).getObserverDelegate();
                    }
                    if (delegate == null || delegate.equals(observer)) {
                        // Unsupported by CopyOnWriteArraySet: iterator.remove();
                        observers.remove(candidate);
                    }
                }
            }
        }
    }

}