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Access to the Neo4j graph database through Java
/*
* Copyright (c) 2016-2021 VMware Inc. or its affiliates, 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
*
* https://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 the value type
* @see Reactive-Streams-Commons
*/
final class MonoSwitchIfEmpty extends InternalMonoOperator {
final Mono other;
MonoSwitchIfEmpty(Mono source, Mono other) {
super(source);
this.other = Objects.requireNonNull(other, "other");
}
@Override
public CoreSubscriber subscribeOrReturn(CoreSubscriber actual) {
FluxSwitchIfEmpty.SwitchIfEmptySubscriber parent = new
FluxSwitchIfEmpty.SwitchIfEmptySubscriber<>(actual, other);
actual.onSubscribe(parent);
return parent;
}
@Override
public Object scanUnsafe(Attr key) {
if (key == Attr.RUN_STYLE) return Attr.RunStyle.SYNC;
return super.scanUnsafe(key);
}
}