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rxjava-core developed by Netflix

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

/**
 * Subscribes Observers on the specified Scheduler.
 * 
 * 
 */
public class OperatorSubscribeOn implements Operator> {

    private final Scheduler scheduler;

    public OperatorSubscribeOn(Scheduler scheduler) {
        this.scheduler = scheduler;
    }

    @Override
    public Subscriber> call(final Subscriber subscriber) {
        final Worker inner = scheduler.createWorker();
        subscriber.add(inner);
        return new Subscriber>(subscriber) {

            @Override
            public void onCompleted() {
                // ignore because this is a nested Observable and we expect only 1 Observable emitted to onNext
            }

            @Override
            public void onError(Throwable e) {
                subscriber.onError(e);
            }

            @Override
            public void onNext(final Observable o) {
                inner.schedule(new Action0() {

                    @Override
                    public void call() {
                        o.unsafeSubscribe(subscriber);
                    }
                });
            }

        };
    }
}