/**
* 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.*;
import rx.
Observable.
OnSubscribe;
import rx.exceptions.
Exceptions;
import rx.functions.
Func0;
import rx.observers.
Subscribers;
/**
* Delays the subscription until the Observable<U> emits an event.
*
* @param <T>
* the value type
* @param <U> the value type of the Observable triggering the delayed subscription
*/
public final class
OnSubscribeDelaySubscriptionWithSelector<T, U> implements
OnSubscribe<T> {
final
Observable<? extends T>
source;
final
Func0<? extends
Observable<U>>
subscriptionDelay;
public
OnSubscribeDelaySubscriptionWithSelector(
Observable<? extends T>
source,
Func0<? extends
Observable<U>>
subscriptionDelay) {
this.
source =
source;
this.
subscriptionDelay =
subscriptionDelay;
}
@
Override
public void
call(final
Subscriber<? super T>
child) {
try {
subscriptionDelay.
call().
take(1).
unsafeSubscribe(new
Subscriber<U>() {
@
Override
public void
onCompleted() {
// subscribe to actual source
source.
unsafeSubscribe(
Subscribers.
wrap(
child));
}
@
Override
public void
onError(
Throwable e) {
child.
onError(
e);
}
@
Override
public void
onNext(U
t) {
// ignore as we'll complete immediately because of take(1)
}
});
} catch (
Throwable e) {
Exceptions.
throwOrReport(
e,
child);
}
}
}