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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.rxjava3.internal.operators.single;
import io.reactivex.rxjava3.core.*;
import io.reactivex.rxjava3.disposables.Disposable;
import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
import io.reactivex.rxjava3.internal.observers.DeferredScalarDisposable;
/**
* Wraps a Single and exposes it as an Observable.
*
* @param the value type
*/
public final class SingleToObservable extends Observable {
final SingleSource extends T> source;
public SingleToObservable(SingleSource extends T> source) {
this.source = source;
}
@Override
public void subscribeActual(final Observer super T> observer) {
source.subscribe(create(observer));
}
/**
* Creates a {@link SingleObserver} wrapper around a {@link Observer}.
* History: 2.0.1 - experimental
* @param the value type
* @param downstream the downstream {@code Observer} to talk to
* @return the new SingleObserver instance
* @since 2.2
*/
public static SingleObserver create(Observer super T> downstream) {
return new SingleToObservableObserver<>(downstream);
}
static final class SingleToObservableObserver
extends DeferredScalarDisposable
implements SingleObserver {
private static final long serialVersionUID = 3786543492451018833L;
Disposable upstream;
SingleToObservableObserver(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 dispose() {
super.dispose();
upstream.dispose();
}
}
}