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Easy Redis Java client and Real-Time Data Platform. Valkey compatible. Sync/Async/RxJava3/Reactive API. Client side caching. Over 50 Redis based Java objects and services: JCache API, Apache Tomcat, Hibernate, Spring, Set, Multimap, SortedSet, Map, List, Queue, Deque, Semaphore, Lock, AtomicLong, Map Reduce, Bloom filter, Scheduler, RPC
/*
* 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.rxjava3.internal.operators.flowable;
import java.util.NoSuchElementException;
import org.reactivestreams.*;
import io.reactivex.rxjava3.core.*;
import io.reactivex.rxjava3.internal.subscriptions.*;
import io.reactivex.rxjava3.plugins.RxJavaPlugins;
public final class FlowableElementAt extends AbstractFlowableWithUpstream {
final long index;
final T defaultValue;
final boolean errorOnFewer;
public FlowableElementAt(Flowable source, long index, T defaultValue, boolean errorOnFewer) {
super(source);
this.index = index;
this.defaultValue = defaultValue;
this.errorOnFewer = errorOnFewer;
}
@Override
protected void subscribeActual(Subscriber super T> s) {
source.subscribe(new ElementAtSubscriber<>(s, index, defaultValue, errorOnFewer));
}
static final class ElementAtSubscriber extends DeferredScalarSubscription implements FlowableSubscriber {
private static final long serialVersionUID = 4066607327284737757L;
final long index;
final T defaultValue;
final boolean errorOnFewer;
Subscription upstream;
long count;
boolean done;
ElementAtSubscriber(Subscriber super T> actual, long index, T defaultValue, boolean errorOnFewer) {
super(actual);
this.index = index;
this.defaultValue = defaultValue;
this.errorOnFewer = errorOnFewer;
}
@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();
complete(t);
return;
}
count = c + 1;
}
@Override
public void onError(Throwable t) {
if (done) {
RxJavaPlugins.onError(t);
return;
}
done = true;
downstream.onError(t);
}
@Override
public void onComplete() {
if (!done) {
done = true;
T v = defaultValue;
if (v == null) {
if (errorOnFewer) {
downstream.onError(new NoSuchElementException());
} else {
downstream.onComplete();
}
} else {
complete(v);
}
}
}
@Override
public void cancel() {
super.cancel();
upstream.cancel();
}
}
}
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