/**
* 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 io.reactivex.*;
import io.reactivex.disposables.
Disposable;
import io.reactivex.internal.disposables.
DisposableHelper;
import io.reactivex.internal.fuseable.
HasUpstreamMaybeSource;
import io.reactivex.internal.observers.
DeferredScalarDisposable;
/**
* Wraps a MaybeSource and exposes it as an Observable, relaying signals in a backpressure-aware manner
* and composes cancellation through.
*
* @param <T> the value type
*/
public final class
MaybeToObservable<T> extends
Observable<T> implements
HasUpstreamMaybeSource<T> {
final
MaybeSource<T>
source;
public
MaybeToObservable(
MaybeSource<T>
source) {
this.
source =
source;
}
@
Override
public
MaybeSource<T>
source() {
return
source;
}
@
Override
protected void
subscribeActual(
Observer<? super T>
observer) {
source.
subscribe(
create(
observer));
}
/**
* Creates a {@link MaybeObserver} wrapper around a {@link Observer}.
* <p>History: 2.1.11 - experimental
* @param <T> the value type
* @param downstream the downstream {@code Observer} to talk to
* @return the new MaybeObserver instance
* @since 2.2
*/
public static <T>
MaybeObserver<T>
create(
Observer<? super T>
downstream) {
return new
MaybeToObservableObserver<T>(
downstream);
}
static final class
MaybeToObservableObserver<T> extends
DeferredScalarDisposable<T>
implements
MaybeObserver<T> {
private static final long
serialVersionUID = 7603343402964826922L;
Disposable upstream;
MaybeToObservableObserver(
Observer<? super T>
downstream) {
super(
downstream);
}
@
Override
public void
onSubscribe(
Disposable d) {
if (
DisposableHelper.
validate(this.
upstream,
d)) {
this.
upstream =
d;
downstream.
onSubscribe(this);
}
}
@
Override
public void
onSuccess(T
value) {
complete(
value);
}
@
Override
public void
onError(
Throwable e) {
error(
e);
}
@
Override
public void
onComplete() {
complete();
}
@
Override
public void
dispose() {
super.dispose();
upstream.
dispose();
}
}
}