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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.operators;
import java.util.concurrent.atomic.AtomicBoolean;
import rx.Observable;
import rx.Observable.OnSubscribeFunc;
import rx.Observer;
import rx.Subscription;
import rx.functions.Func1;
/**
* Returns an Observable that emits a Boolean that indicates whether all items emitted by an
* Observable satisfy a condition.
*
* 
*/
public class OperationAll {
public static OnSubscribeFunc all(Observable sequence, Func1 predicate) {
return new AllObservable(sequence, predicate);
}
private static class AllObservable implements OnSubscribeFunc {
private final Observable sequence;
private final Func1 predicate;
private final SafeObservableSubscription subscription = new SafeObservableSubscription();
private AllObservable(Observable sequence, Func1 predicate) {
this.sequence = sequence;
this.predicate = predicate;
}
@Override
public Subscription onSubscribe(final Observer observer) {
return subscription.wrap(sequence.subscribe(new AllObserver(observer)));
}
private class AllObserver implements Observer {
private final Observer underlying;
private final AtomicBoolean status = new AtomicBoolean(true);
public AllObserver(Observer underlying) {
this.underlying = underlying;
}
@Override
public void onCompleted() {
if (status.get()) {
underlying.onNext(true);
underlying.onCompleted();
}
}
@Override
public void onError(Throwable e) {
underlying.onError(e);
}
@Override
public void onNext(T args) {
boolean result = predicate.call(args);
boolean changed = status.compareAndSet(true, result);
if (changed && !result) {
underlying.onNext(false);
underlying.onCompleted();
subscription.unsubscribe();
}
}
}
}
}