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/*
* 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.observable;
import io.reactivex.rxjava3.core.*;
import io.reactivex.rxjava3.disposables.Disposable;
import io.reactivex.rxjava3.internal.disposables.*;
import io.reactivex.rxjava3.plugins.RxJavaPlugins;
public final class ObservableTake extends AbstractObservableWithUpstream {
final long limit;
public ObservableTake(ObservableSource source, long limit) {
super(source);
this.limit = limit;
}
@Override
protected void subscribeActual(Observer super T> observer) {
source.subscribe(new TakeObserver<>(observer, limit));
}
static final class TakeObserver implements Observer, Disposable {
final Observer super T> downstream;
boolean done;
Disposable upstream;
long remaining;
TakeObserver(Observer super T> actual, long limit) {
this.downstream = actual;
this.remaining = limit;
}
@Override
public void onSubscribe(Disposable d) {
if (DisposableHelper.validate(this.upstream, d)) {
upstream = d;
if (remaining == 0) {
done = true;
d.dispose();
EmptyDisposable.complete(downstream);
} else {
downstream.onSubscribe(this);
}
}
}
@Override
public void onNext(T t) {
if (!done && remaining-- > 0) {
boolean stop = remaining == 0;
downstream.onNext(t);
if (stop) {
onComplete();
}
}
}
@Override
public void onError(Throwable t) {
if (done) {
RxJavaPlugins.onError(t);
return;
}
done = true;
upstream.dispose();
downstream.onError(t);
}
@Override
public void onComplete() {
if (!done) {
done = true;
upstream.dispose();
downstream.onComplete();
}
}
@Override
public void dispose() {
upstream.dispose();
}
@Override
public boolean isDisposed() {
return upstream.isDisposed();
}
}
}
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