/**
* 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<T, R> extends
Maybe<R> {
final
Iterable<? extends
MaybeSource<? extends T>>
sources;
final
Function<? super
Object[], ? extends R>
zipper;
public
MaybeZipIterable(
Iterable<? extends
MaybeSource<? extends T>>
sources,
Function<? super
Object[], ? extends R>
zipper) {
this.
sources =
sources;
this.
zipper =
zipper;
}
@
Override
protected void
subscribeActual(
MaybeObserver<? super R>
observer) {
@
SuppressWarnings("unchecked")
MaybeSource<? extends T>[]
a = new
MaybeSource[8];
int
n = 0;
try {
for (
MaybeSource<? extends T>
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<T, R>(
observer, new
SingletonArrayFunc()));
return;
}
ZipCoordinator<T, R>
parent = new
ZipCoordinator<T, R>(
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<T, R> {
@
Override
public R
apply(T
t) throws
Exception {
return
ObjectHelper.
requireNonNull(
zipper.
apply(new
Object[] {
t }), "The zipper returned a null value");
}
}
}