/**
* 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.observable;
import io.reactivex.*;
import io.reactivex.disposables.
Disposable;
import io.reactivex.internal.disposables.*;
import io.reactivex.plugins.
RxJavaPlugins;
public final class
ObservableTake<T> extends
AbstractObservableWithUpstream<T, T> {
final long
limit;
public
ObservableTake(
ObservableSource<T>
source, long
limit) {
super(
source);
this.
limit =
limit;
}
@
Override
protected void
subscribeActual(
Observer<? super T>
observer) {
source.
subscribe(new
TakeObserver<T>(
observer,
limit));
}
static final class
TakeObserver<T> implements
Observer<T>,
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();
}
}
}