Copyright (c) 2016-present, RxJava Contributors. 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.
/** * Copyright (c) 2016-present, RxJava Contributors. * * 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 io.reactivex.internal.operators.flowable; import org.reactivestreams.*; import io.reactivex.*; import io.reactivex.disposables.Disposable; import io.reactivex.internal.fuseable.FuseToFlowable; import io.reactivex.internal.subscriptions.SubscriptionHelper; import io.reactivex.plugins.RxJavaPlugins; public final class FlowableElementAtMaybe<T> extends Maybe<T> implements FuseToFlowable<T> { final Flowable<T> source; final long index; public FlowableElementAtMaybe(Flowable<T> source, long index) { this.source = source; this.index = index; } @Override protected void subscribeActual(MaybeObserver<? super T> observer) { source.subscribe(new ElementAtSubscriber<T>(observer, index)); } @Override public Flowable<T> fuseToFlowable() { return RxJavaPlugins.onAssembly(new FlowableElementAt<T>(source, index, null, false)); } static final class ElementAtSubscriber<T> implements FlowableSubscriber<T>, Disposable { final MaybeObserver<? super T> downstream; final long index; Subscription upstream; long count; boolean done; ElementAtSubscriber(MaybeObserver<? super T> actual, long index) { this.downstream = actual; this.index = index; } @Override public void onSubscribe(Subscription s) { if (SubscriptionHelper.validate(this.upstream, s)) { this.upstream = s; downstream.onSubscribe(this); s.request(Long.MAX_VALUE); } } @Override public void onNext(T t) { if (done) { return; } long c = count; if (c == index) { done = true; upstream.cancel(); upstream = SubscriptionHelper.CANCELLED; downstream.onSuccess(t); return; } count = c + 1; } @Override public void onError(Throwable t) { if (done) { RxJavaPlugins.onError(t); return; } done = true; upstream = SubscriptionHelper.CANCELLED; downstream.onError(t); } @Override public void onComplete() { upstream = SubscriptionHelper.CANCELLED; if (!done) { done = true; downstream.onComplete(); } } @Override public void dispose() { upstream.cancel(); upstream = SubscriptionHelper.CANCELLED; } @Override public boolean isDisposed() { return upstream == SubscriptionHelper.CANCELLED; } } }