io.reactivex.rxjava3.internal.operators.single.SingleDematerialize Maven / Gradle / Ivy
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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.exceptions.Exceptions;
import io.reactivex.rxjava3.functions.Function;
import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
import java.util.Objects;
/**
* Maps the success value of the source to a Notification, then
* maps it back to the corresponding signal type.
* History: 2.2.4 - experimental
* @param the element type of the source
* @param the element type of the Notification and result
* @since 3.0.0
*/
public final class SingleDematerialize extends Maybe {
final Single source;
final Function super T, Notification> selector;
public SingleDematerialize(Single source, Function super T, Notification> selector) {
this.source = source;
this.selector = selector;
}
@Override
protected void subscribeActual(MaybeObserver super R> observer) {
source.subscribe(new DematerializeObserver<>(observer, selector));
}
static final class DematerializeObserver implements SingleObserver, Disposable {
final MaybeObserver super R> downstream;
final Function super T, Notification> selector;
Disposable upstream;
DematerializeObserver(MaybeObserver super R> downstream,
Function super T, Notification> selector) {
this.downstream = downstream;
this.selector = selector;
}
@Override
public void dispose() {
upstream.dispose();
}
@Override
public boolean isDisposed() {
return upstream.isDisposed();
}
@Override
public void onSubscribe(Disposable d) {
if (DisposableHelper.validate(upstream, d)) {
upstream = d;
downstream.onSubscribe(this);
}
}
@Override
public void onSuccess(T t) {
Notification notification;
try {
notification = Objects.requireNonNull(selector.apply(t), "The selector returned a null Notification");
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
downstream.onError(ex);
return;
}
if (notification.isOnNext()) {
downstream.onSuccess(notification.getValue());
} else if (notification.isOnComplete()) {
downstream.onComplete();
} else {
downstream.onError(notification.getError());
}
}
@Override
public void onError(Throwable e) {
downstream.onError(e);
}
}
}