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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.flowable;
import java.util.Iterator;
import org.reactivestreams.*;
import io.reactivex.*;
import io.reactivex.exceptions.Exceptions;
import io.reactivex.functions.BiFunction;
import io.reactivex.internal.functions.ObjectHelper;
import io.reactivex.internal.subscriptions.*;
import io.reactivex.plugins.RxJavaPlugins;
public final class FlowableZipIterable extends AbstractFlowableWithUpstream {
final Iterable other;
final BiFunction zipper;
public FlowableZipIterable(
Flowable source,
Iterable other, BiFunction zipper) {
super(source);
this.other = other;
this.zipper = zipper;
}
@Override
public void subscribeActual(Subscriber t) {
Iterator it;
try {
it = ObjectHelper.requireNonNull(other.iterator(), "The iterator returned by other is null");
} catch (Throwable e) {
Exceptions.throwIfFatal(e);
EmptySubscription.error(e, t);
return;
}
boolean b;
try {
b = it.hasNext();
} catch (Throwable e) {
Exceptions.throwIfFatal(e);
EmptySubscription.error(e, t);
return;
}
if (!b) {
EmptySubscription.complete(t);
return;
}
source.subscribe(new ZipIterableSubscriber(t, it, zipper));
}
static final class ZipIterableSubscriber implements FlowableSubscriber, Subscription {
final Subscriber downstream;
final Iterator iterator;
final BiFunction zipper;
Subscription upstream;
boolean done;
ZipIterableSubscriber(Subscriber actual, Iterator iterator,
BiFunction zipper) {
this.downstream = actual;
this.iterator = iterator;
this.zipper = zipper;
}
@Override
public void onSubscribe(Subscription s) {
if (SubscriptionHelper.validate(this.upstream, s)) {
this.upstream = s;
downstream.onSubscribe(this);
}
}
@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) {
error(e);
return;
}
V v;
try {
v = ObjectHelper.requireNonNull(zipper.apply(t, u), "The zipper function returned a null value");
} catch (Throwable e) {
error(e);
return;
}
downstream.onNext(v);
boolean b;
try {
b = iterator.hasNext();
} catch (Throwable e) {
error(e);
return;
}
if (!b) {
done = true;
upstream.cancel();
downstream.onComplete();
}
}
void error(Throwable e) {
Exceptions.throwIfFatal(e);
done = true;
upstream.cancel();
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();
}
@Override
public void request(long n) {
upstream.request(n);
}
@Override
public void cancel() {
upstream.cancel();
}
}
}