/*
* Copyright (c) 2011-2017 Pivotal Software Inc, All Rights Reserved.
*
* 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 reactor.core.publisher;
import java.util.
Objects;
import reactor.core.
CoreSubscriber;
/**
* Switches to another source if the first source turns out to be empty.
*
* @param <T> the value type
* @see <a href="https://github.com/reactor/reactive-streams-commons">Reactive-Streams-Commons</a>
*/
final class
MonoSwitchIfEmpty<T> extends
MonoOperator<T, T> {
final
Mono<? extends T>
other;
MonoSwitchIfEmpty(
Mono<? extends T>
source,
Mono<? extends T>
other) {
super(
source);
this.
other =
Objects.
requireNonNull(
other, "other");
}
@
Override
public void
subscribe(
CoreSubscriber<? super T>
actual) {
FluxSwitchIfEmpty.
SwitchIfEmptySubscriber<T>
parent = new
FluxSwitchIfEmpty.
SwitchIfEmptySubscriber<>(
actual,
other);
actual.
onSubscribe(
parent);
source.
subscribe(
parent);
}
}