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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.Iterator;
import io.reactivex.*;
import io.reactivex.disposables.Disposable;
import io.reactivex.exceptions.Exceptions;
import io.reactivex.functions.BiFunction;
import io.reactivex.internal.disposables.*;
import io.reactivex.plugins.RxJavaPlugins;
public final class ObservableZipIterable extends Observable {
final Observable source;
final Iterable other;
final BiFunction zipper;
public ObservableZipIterable(
Observable source,
Iterable other, BiFunction zipper) {
this.source = source;
this.other = other;
this.zipper = zipper;
}
@Override
public void subscribeActual(Observer t) {
Iterator it;
try {
it = ObjectHelper.requireNonNull(other.iterator(), "The iterator returned by other is null");
} catch (Throwable e) {
Exceptions.throwIfFatal(e);
EmptyDisposable.error(e, t);
return;
}
boolean b;
try {
b = it.hasNext();
} catch (Throwable e) {
Exceptions.throwIfFatal(e);
EmptyDisposable.error(e, t);
return;
}
if (!b) {
EmptyDisposable.complete(t);
return;
}
source.subscribe(new ZipIterableObserver(t, it, zipper));
}
static final class ZipIterableObserver implements Observer, Disposable {
final Observer downstream;
final Iterator iterator;
final BiFunction zipper;
Disposable upstream;
boolean done;
ZipIterableObserver(Observer actual, Iterator iterator,
BiFunction zipper) {
this.downstream = actual;
this.iterator = iterator;
this.zipper = zipper;
}
@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;
}
U u;
try {
u = ObjectHelper.requireNonNull(iterator.next(), "The iterator returned a null value");
} catch (Throwable e) {
Exceptions.throwIfFatal(e);
error(e);
return;
}
V v;
try {
v = ObjectHelper.requireNonNull(zipper.apply(t, u), "The zipper function returned a null value");
} catch (Throwable e) {
Exceptions.throwIfFatal(e);
error(e);
return;
}
downstream.onNext(v);
boolean b;
try {
b = iterator.hasNext();
} catch (Throwable e) {
Exceptions.throwIfFatal(e);
error(e);
return;
}
if (!b) {
done = true;
upstream.dispose();
downstream.onComplete();
}
}
void error(Throwable e) {
done = true;
upstream.dispose();
downstream.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.onComplete();
}
}
}