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Reactive Extensions for Java
/**
* 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.atomic.AtomicReference;
import io.reactivex.*;
import io.reactivex.disposables.Disposable;
import io.reactivex.internal.disposables.DisposableHelper;
/**
* Subscribes to the other source if the main source is empty.
*
* @param the value type
*/
public final class MaybeSwitchIfEmpty extends AbstractMaybeWithUpstream {
final MaybeSource extends T> other;
public MaybeSwitchIfEmpty(MaybeSource source, MaybeSource extends T> other) {
super(source);
this.other = other;
}
@Override
protected void subscribeActual(MaybeObserver super T> observer) {
source.subscribe(new SwitchIfEmptyMaybeObserver(observer, other));
}
static final class SwitchIfEmptyMaybeObserver
extends AtomicReference
implements MaybeObserver, Disposable {
private static final long serialVersionUID = -2223459372976438024L;
final MaybeObserver super T> downstream;
final MaybeSource extends T> other;
SwitchIfEmptyMaybeObserver(MaybeObserver super T> actual, MaybeSource extends T> other) {
this.downstream = actual;
this.other = other;
}
@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) {
downstream.onSuccess(value);
}
@Override
public void onError(Throwable e) {
downstream.onError(e);
}
@Override
public void onComplete() {
Disposable d = get();
if (d != DisposableHelper.DISPOSED) {
if (compareAndSet(d, null)) {
other.subscribe(new OtherMaybeObserver(downstream, this));
}
}
}
static final class OtherMaybeObserver implements MaybeObserver {
final MaybeObserver super T> downstream;
final AtomicReference parent;
OtherMaybeObserver(MaybeObserver super T> actual, AtomicReference parent) {
this.downstream = actual;
this.parent = parent;
}
@Override
public void onSubscribe(Disposable d) {
DisposableHelper.setOnce(parent, d);
}
@Override
public void onSuccess(T value) {
downstream.onSuccess(value);
}
@Override
public void onError(Throwable e) {
downstream.onError(e);
}
@Override
public void onComplete() {
downstream.onComplete();
}
}
}
}
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