/*
* 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 org.reactivestreams.
Publisher;
import reactor.core.
CoreSubscriber;
import reactor.core.
Scannable;
import reactor.util.annotation.
Nullable;
/**
* Emits a single item at most from the source.
*
* @param <T> the value type
*
* @see <a href="https://github.com/reactor/reactive-streams-commons">Reactive-Streams-Commons</a>
*/
final class
MonoFromPublisher<T> extends
Mono<T> implements
Scannable {
final
Publisher<? extends T>
source;
MonoFromPublisher(
Publisher<? extends T>
source) {
this.
source =
Objects.
requireNonNull(
source, "publisher");
}
@
Override
public void
subscribe(
CoreSubscriber<? super T>
actual) {
source.
subscribe(new
MonoNext.
NextSubscriber<>(
actual));
}
@
Override
@
Nullable
public
Object scanUnsafe(
Scannable.
Attr key) {
if (
key ==
Scannable.
Attr.
PARENT) {
return
source;
}
return null;
}
}