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Reactive Extensions for Java
/**
* 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.internal.functions.ObjectHelper;
import java.util.concurrent.Callable;
import io.reactivex.*;
import io.reactivex.disposables.Disposable;
import io.reactivex.functions.BiConsumer;
import io.reactivex.internal.disposables.*;
import io.reactivex.plugins.RxJavaPlugins;
public final class ObservableCollect extends AbstractObservableWithUpstream {
final Callable initialSupplier;
final BiConsumer collector;
public ObservableCollect(ObservableSource source,
Callable initialSupplier, BiConsumer collector) {
super(source);
this.initialSupplier = initialSupplier;
this.collector = collector;
}
@Override
protected void subscribeActual(Observer t) {
U u;
try {
u = ObjectHelper.requireNonNull(initialSupplier.call(), "The initialSupplier returned a null value");
} catch (Throwable e) {
EmptyDisposable.error(e, t);
return;
}
source.subscribe(new CollectObserver(t, u, collector));
}
static final class CollectObserver implements Observer, Disposable {
final Observer downstream;
final BiConsumer collector;
final U u;
Disposable upstream;
boolean done;
CollectObserver(Observer actual, U u, BiConsumer collector) {
this.downstream = actual;
this.collector = collector;
this.u = u;
}
@Override
public void onSubscribe(Disposable d) {
if (DisposableHelper.validate(this.upstream, d)) {
this.upstream = d;
downstream.onSubscribe(this);
}
}
@Override
public void dispose() {
upstream.dispose();
}
@Override
public boolean isDisposed() {
return upstream.isDisposed();
}
@Override
public void onNext(T t) {
if (done) {
return;
}
try {
collector.accept(u, t);
} catch (Throwable e) {
upstream.dispose();
onError(e);
}
}
@Override
public void onError(Throwable t) {
if (done) {
RxJavaPlugins.onError(t);
return;
}
done = true;
downstream.onError(t);
}
@Override
public void onComplete() {
if (done) {
return;
}
done = true;
downstream.onNext(u);
downstream.onComplete();
}
}
}