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/**
 * Copyright 2014 Netflix, Inc.
 *
 * 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 rx.internal.operators;

import rx.Observable.Operator;
import rx.Subscriber;
import rx.functions.Action0;

/**
 * Registers an action to be called after an Observable invokes onComplete or onError.
 * 
 * 
 * 
 * See also the MSDN
 * Observable.Finally method
 * 
 * @param  the value type
 */
public final class OperatorFinally implements Operator {
    final Action0 action;

    public OperatorFinally(Action0 action) {
        this.action = action;
    }

    @Override
    public Subscriber call(final Subscriber child) {
        return new Subscriber(child) {

            @Override
            public void onNext(T t) {
                child.onNext(t);
            }

            @Override
            public void onError(Throwable e) {
                try {
                    child.onError(e);
                } finally {
                    action.call();
                }
            }

            @Override
            public void onCompleted() {
                try {
                    child.onCompleted();
                } finally {
                    action.call();
                }
            }
        };
    }
    
}