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/**
* 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 io.reactivex.Maybe;
import io.reactivex.MaybeObserver;
import io.reactivex.MaybeSource;
import io.reactivex.SingleObserver;
import io.reactivex.SingleSource;
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;
import java.util.concurrent.atomic.AtomicReference;
public final class SingleFlatMapMaybe extends Maybe {
final SingleSource source;
final Function> mapper;
public SingleFlatMapMaybe(SingleSource source, Function> mapper) {
this.mapper = mapper;
this.source = source;
}
@Override
protected void subscribeActual(MaybeObserver downstream) {
source.subscribe(new FlatMapSingleObserver(downstream, mapper));
}
static final class FlatMapSingleObserver
extends AtomicReference
implements SingleObserver, Disposable {
private static final long serialVersionUID = -5843758257109742742L;
final MaybeObserver downstream;
final Function> mapper;
FlatMapSingleObserver(MaybeObserver actual, Function> 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) {
if (DisposableHelper.setOnce(this, d)) {
downstream.onSubscribe(this);
}
}
@Override
public void onSuccess(T value) {
MaybeSource ms;
try {
ms = ObjectHelper.requireNonNull(mapper.apply(value), "The mapper returned a null MaybeSource");
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
onError(ex);
return;
}
if (!isDisposed()) {
ms.subscribe(new FlatMapMaybeObserver(this, downstream));
}
}
@Override
public void onError(Throwable e) {
downstream.onError(e);
}
}
static final class FlatMapMaybeObserver implements MaybeObserver {
final AtomicReference parent;
final MaybeObserver downstream;
FlatMapMaybeObserver(AtomicReference parent, MaybeObserver downstream) {
this.parent = parent;
this.downstream = downstream;
}
@Override
public void onSubscribe(final Disposable d) {
DisposableHelper.replace(parent, d);
}
@Override
public void onSuccess(final R value) {
downstream.onSuccess(value);
}
@Override
public void onError(final Throwable e) {
downstream.onError(e);
}
@Override
public void onComplete() {
downstream.onComplete();
}
}
}