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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.flowable;
import org.reactivestreams.*;
import io.reactivex.*;
import io.reactivex.internal.subscriptions.SubscriptionArbiter;
public final class FlowableSwitchIfEmpty extends AbstractFlowableWithUpstream {
final Publisher extends T> other;
public FlowableSwitchIfEmpty(Flowable source, Publisher extends T> other) {
super(source);
this.other = other;
}
@Override
protected void subscribeActual(Subscriber super T> s) {
SwitchIfEmptySubscriber parent = new SwitchIfEmptySubscriber(s, other);
s.onSubscribe(parent.arbiter);
source.subscribe(parent);
}
static final class SwitchIfEmptySubscriber implements FlowableSubscriber {
final Subscriber super T> downstream;
final Publisher extends T> other;
final SubscriptionArbiter arbiter;
boolean empty;
SwitchIfEmptySubscriber(Subscriber super T> actual, Publisher extends T> other) {
this.downstream = actual;
this.other = other;
this.empty = true;
this.arbiter = new SubscriptionArbiter(false);
}
@Override
public void onSubscribe(Subscription s) {
arbiter.setSubscription(s);
}
@Override
public void onNext(T t) {
if (empty) {
empty = false;
}
downstream.onNext(t);
}
@Override
public void onError(Throwable t) {
downstream.onError(t);
}
@Override
public void onComplete() {
if (empty) {
empty = false;
other.subscribe(this);
} else {
downstream.onComplete();
}
}
}
}
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