/**
* 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.concurrent.
Callable;
import java.util.concurrent.atomic.
AtomicReference;
import io.reactivex.*;
import io.reactivex.disposables.
Disposable;
import io.reactivex.exceptions.*;
import io.reactivex.functions.
Function;
import io.reactivex.internal.disposables.
DisposableHelper;
import io.reactivex.internal.functions.
ObjectHelper;
/**
* Maps a value into a MaybeSource and relays its signal.
*
* @param <T> the source value type
* @param <R> the result value type
*/
public final class
MaybeFlatMapNotification<T, R> extends
AbstractMaybeWithUpstream<T, R> {
final
Function<? super T, ? extends
MaybeSource<? extends R>>
onSuccessMapper;
final
Function<? super
Throwable, ? extends
MaybeSource<? extends R>>
onErrorMapper;
final
Callable<? extends
MaybeSource<? extends R>>
onCompleteSupplier;
public
MaybeFlatMapNotification(
MaybeSource<T>
source,
Function<? super T, ? extends
MaybeSource<? extends R>>
onSuccessMapper,
Function<? super
Throwable, ? extends
MaybeSource<? extends R>>
onErrorMapper,
Callable<? extends
MaybeSource<? extends R>>
onCompleteSupplier) {
super(
source);
this.
onSuccessMapper =
onSuccessMapper;
this.
onErrorMapper =
onErrorMapper;
this.
onCompleteSupplier =
onCompleteSupplier;
}
@
Override
protected void
subscribeActual(
MaybeObserver<? super R>
observer) {
source.
subscribe(new
FlatMapMaybeObserver<T, R>(
observer,
onSuccessMapper,
onErrorMapper,
onCompleteSupplier));
}
static final class
FlatMapMaybeObserver<T, R>
extends
AtomicReference<
Disposable>
implements
MaybeObserver<T>,
Disposable {
private static final long
serialVersionUID = 4375739915521278546L;
final
MaybeObserver<? super R>
downstream;
final
Function<? super T, ? extends
MaybeSource<? extends R>>
onSuccessMapper;
final
Function<? super
Throwable, ? extends
MaybeSource<? extends R>>
onErrorMapper;
final
Callable<? extends
MaybeSource<? extends R>>
onCompleteSupplier;
Disposable upstream;
FlatMapMaybeObserver(
MaybeObserver<? super R>
actual,
Function<? super T, ? extends
MaybeSource<? extends R>>
onSuccessMapper,
Function<? super
Throwable, ? extends
MaybeSource<? extends R>>
onErrorMapper,
Callable<? extends
MaybeSource<? extends R>>
onCompleteSupplier) {
this.
downstream =
actual;
this.
onSuccessMapper =
onSuccessMapper;
this.
onErrorMapper =
onErrorMapper;
this.
onCompleteSupplier =
onCompleteSupplier;
}
@
Override
public void
dispose() {
DisposableHelper.
dispose(this);
upstream.
dispose();
}
@
Override
public boolean
isDisposed() {
return
DisposableHelper.
isDisposed(
get());
}
@
Override
public void
onSubscribe(
Disposable d) {
if (
DisposableHelper.
validate(this.
upstream,
d)) {
this.
upstream =
d;
downstream.
onSubscribe(this);
}
}
@
Override
public void
onSuccess(T
value) {
MaybeSource<? extends R>
source;
try {
source =
ObjectHelper.
requireNonNull(
onSuccessMapper.
apply(
value), "The onSuccessMapper returned a null MaybeSource");
} catch (
Exception ex) {
Exceptions.
throwIfFatal(
ex);
downstream.
onError(
ex);
return;
}
source.
subscribe(new
InnerObserver());
}
@
Override
public void
onError(
Throwable e) {
MaybeSource<? extends R>
source;
try {
source =
ObjectHelper.
requireNonNull(
onErrorMapper.
apply(
e), "The onErrorMapper returned a null MaybeSource");
} catch (
Exception ex) {
Exceptions.
throwIfFatal(
ex);
downstream.
onError(new
CompositeException(
e,
ex));
return;
}
source.
subscribe(new
InnerObserver());
}
@
Override
public void
onComplete() {
MaybeSource<? extends R>
source;
try {
source =
ObjectHelper.
requireNonNull(
onCompleteSupplier.
call(), "The onCompleteSupplier returned a null MaybeSource");
} catch (
Exception ex) {
Exceptions.
throwIfFatal(
ex);
downstream.
onError(
ex);
return;
}
source.
subscribe(new
InnerObserver());
}
final class
InnerObserver implements
MaybeObserver<R> {
@
Override
public void
onSubscribe(
Disposable d) {
DisposableHelper.
setOnce(
FlatMapMaybeObserver.this,
d);
}
@
Override
public void
onSuccess(R
value) {
downstream.
onSuccess(
value);
}
@
Override
public void
onError(
Throwable e) {
downstream.
onError(
e);
}
@
Override
public void
onComplete() {
downstream.
onComplete();
}
}
}
}