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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.maybe;
import java.util.Arrays;
import io.reactivex.*;
import io.reactivex.exceptions.Exceptions;
import io.reactivex.functions.Function;
import io.reactivex.internal.disposables.EmptyDisposable;
import io.reactivex.internal.functions.ObjectHelper;
import io.reactivex.internal.operators.maybe.MaybeZipArray.ZipCoordinator;
public final class MaybeZipIterable extends Maybe {
final Iterable> sources;
final Function zipper;
public MaybeZipIterable(Iterable> sources, Function zipper) {
this.sources = sources;
this.zipper = zipper;
}
@Override
protected void subscribeActual(MaybeObserver observer) {
@SuppressWarnings("unchecked")
MaybeSource[] a = new MaybeSource[8];
int n = 0;
try {
for (MaybeSource source : sources) {
if (source == null) {
EmptyDisposable.error(new NullPointerException("One of the sources is null"), observer);
return;
}
if (n == a.length) {
a = Arrays.copyOf(a, n + (n >> 2));
}
a[n++] = source;
}
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
EmptyDisposable.error(ex, observer);
return;
}
if (n == 0) {
EmptyDisposable.complete(observer);
return;
}
if (n == 1) {
a[0].subscribe(new MaybeMap.MapMaybeObserver(observer, new SingletonArrayFunc()));
return;
}
ZipCoordinator parent = new ZipCoordinator(observer, n, zipper);
observer.onSubscribe(parent);
for (int i = 0; i < n; i++) {
if (parent.isDisposed()) {
return;
}
a[i].subscribe(parent.observers[i]);
}
}
final class SingletonArrayFunc implements Function {
@Override
public R apply(T t) throws Exception {
return ObjectHelper.requireNonNull(zipper.apply(new Object[] { t }), "The zipper returned a null value");
}
}
}