/**
* 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.single;
import java.util.concurrent.atomic.
AtomicReference;
import io.reactivex.*;
import io.reactivex.disposables.
Disposable;
import io.reactivex.exceptions.
Exceptions;
import io.reactivex.functions.
Function;
import io.reactivex.internal.disposables.
DisposableHelper;
import io.reactivex.internal.functions.
ObjectHelper;
/**
* Maps the success value of the source SingleSource into a Completable.
* @param <T> the value type of the source SingleSource
*/
public final class
SingleFlatMapCompletable<T> extends
Completable {
final
SingleSource<T>
source;
final
Function<? super T, ? extends
CompletableSource>
mapper;
public
SingleFlatMapCompletable(
SingleSource<T>
source,
Function<? super T, ? extends
CompletableSource>
mapper) {
this.
source =
source;
this.
mapper =
mapper;
}
@
Override
protected void
subscribeActual(
CompletableObserver observer) {
FlatMapCompletableObserver<T>
parent = new
FlatMapCompletableObserver<T>(
observer,
mapper);
observer.
onSubscribe(
parent);
source.
subscribe(
parent);
}
static final class
FlatMapCompletableObserver<T>
extends
AtomicReference<
Disposable>
implements
SingleObserver<T>,
CompletableObserver,
Disposable {
private static final long
serialVersionUID = -2177128922851101253L;
final
CompletableObserver downstream;
final
Function<? super T, ? extends
CompletableSource>
mapper;
FlatMapCompletableObserver(
CompletableObserver actual,
Function<? super T, ? extends
CompletableSource>
mapper) {
this.
downstream =
actual;
this.
mapper =
mapper;
}
@
Override
public void
dispose() {
DisposableHelper.
dispose(this);
}
@
Override
public boolean
isDisposed() {
return
DisposableHelper.
isDisposed(
get());
}
@
Override
public void
onSubscribe(
Disposable d) {
DisposableHelper.
replace(this,
d);
}
@
Override
public void
onSuccess(T
value) {
CompletableSource cs;
try {
cs =
ObjectHelper.
requireNonNull(
mapper.
apply(
value), "The mapper returned a null CompletableSource");
} catch (
Throwable ex) {
Exceptions.
throwIfFatal(
ex);
onError(
ex);
return;
}
if (!
isDisposed()) {
cs.
subscribe(this);
}
}
@
Override
public void
onError(
Throwable e) {
downstream.
onError(
e);
}
@
Override
public void
onComplete() {
downstream.
onComplete();
}
}
}