/**
* 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.mixed;
import java.util.concurrent.atomic.*;
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 a Single onto an ObservableSource and
* relays its signals to the downstream observer.
*
* @param <T> the success value type of the Single source
* @param <R> the result type of the ObservableSource and this operator
* @since 2.1.15
*/
public final class
SingleFlatMapObservable<T, R> extends
Observable<R> {
final
SingleSource<T>
source;
final
Function<? super T, ? extends
ObservableSource<? extends R>>
mapper;
public
SingleFlatMapObservable(
SingleSource<T>
source,
Function<? super T, ? extends
ObservableSource<? extends R>>
mapper) {
this.
source =
source;
this.
mapper =
mapper;
}
@
Override
protected void
subscribeActual(
Observer<? super R>
observer) {
FlatMapObserver<T, R>
parent = new
FlatMapObserver<T, R>(
observer,
mapper);
observer.
onSubscribe(
parent);
source.
subscribe(
parent);
}
static final class
FlatMapObserver<T, R>
extends
AtomicReference<
Disposable>
implements
Observer<R>,
SingleObserver<T>,
Disposable {
private static final long
serialVersionUID = -8948264376121066672L;
final
Observer<? super R>
downstream;
final
Function<? super T, ? extends
ObservableSource<? extends R>>
mapper;
FlatMapObserver(
Observer<? super R>
downstream,
Function<? super T, ? extends
ObservableSource<? extends R>>
mapper) {
this.
downstream =
downstream;
this.
mapper =
mapper;
}
@
Override
public void
onNext(R
t) {
downstream.
onNext(
t);
}
@
Override
public void
onError(
Throwable t) {
downstream.
onError(
t);
}
@
Override
public void
onComplete() {
downstream.
onComplete();
}
@
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
t) {
ObservableSource<? extends R>
o;
try {
o =
ObjectHelper.
requireNonNull(
mapper.
apply(
t), "The mapper returned a null Publisher");
} catch (
Throwable ex) {
Exceptions.
throwIfFatal(
ex);
downstream.
onError(
ex);
return;
}
o.
subscribe(this);
}
}
}