/**
* 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.Subscriber;
import rx.observers.SerializedSubscriber;
/**
* Returns an Observable that emits the items from the source Observable until another Observable
* emits an item.
* <p>
* <img width="640" src="https://github.com/ReactiveX/RxJava/wiki/images/rx-operators/takeUntil.png" alt="">
*/
public final class OperatorTakeUntil<T, E> implements Operator<T, T> {
private final Observable<? extends E> other;
public OperatorTakeUntil(final Observable<? extends E> other) {
this.other = other;
}
@Override
public Subscriber<? super T> call(final Subscriber<? super T> child) {
final Subscriber<T> serial = new SerializedSubscriber<T>(child, false);
final Subscriber<T> main = new Subscriber<T>(serial, false) {
@Override
public void onNext(T t) {
serial.onNext(t);
}
@Override
public void onError(Throwable e) {
try {
serial.onError(e);
} finally {
serial.unsubscribe();
}
}
@Override
public void onCompleted() {
try {
serial.onCompleted();
} finally {
serial.unsubscribe();
}
}
};
final Subscriber<E> so = new Subscriber<E>() {
@Override
public void onStart() {
request(Long.MAX_VALUE);
}
@Override
public void onCompleted() {
main.onCompleted();
}
@Override
public void onError(Throwable e) {
main.onError(e);
}
@Override
public void onNext(E t) {
onCompleted();
}
};
serial.add(main);
serial.add(so);
child.add(serial);
other.unsafeSubscribe(so);
return main;
}
}