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/*
* Copyright (c) 2016-2022 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 java.util.function.Predicate;
import reactor.core.CoreSubscriber;
import reactor.core.Fuseable;
import reactor.util.annotation.Nullable;
/**
* Emits a single boolean true if any of the values of the source sequence match
* the predicate.
*
* The implementation uses short-circuit logic and completes with true if
* the predicate matches a value.
*
* @param the source value type
* @see Reactive-Streams-Commons
*/
final class MonoAny extends MonoFromFluxOperator
implements Fuseable {
final Predicate super T> predicate;
MonoAny(Flux extends T> source, Predicate super T> predicate) {
super(source);
this.predicate = Objects.requireNonNull(predicate, "predicate");
}
@Override
public CoreSubscriber super T> subscribeOrReturn(CoreSubscriber super Boolean> actual) {
return new AnySubscriber(actual, predicate);
}
@Override
public Object scanUnsafe(Attr key) {
if (key == Attr.RUN_STYLE) return Attr.RunStyle.SYNC;
return super.scanUnsafe(key);
}
static final class AnySubscriber extends
Operators.BaseFluxToMonoOperator {
final Predicate super T> predicate;
boolean done;
AnySubscriber(CoreSubscriber super Boolean> actual, Predicate super T> predicate) {
super(actual);
this.predicate = predicate;
}
@Override
@Nullable
public Object scanUnsafe(Attr key) {
if (key == Attr.TERMINATED) return done;
return super.scanUnsafe(key);
}
@Override
public void onNext(T t) {
if (done) {
Operators.onDiscard(t, this.actual.currentContext());
return;
}
boolean b;
try {
b = predicate.test(t);
} catch (Throwable e) {
done = true;
actual.onError(Operators.onOperatorError(s, e, t, actual.currentContext()));
return;
}
if (b) {
done = true;
s.cancel();
this.actual.onNext(true);
this.actual.onComplete();
}
}
@Override
public void onError(Throwable t) {
if (done) {
Operators.onErrorDropped(t, actual.currentContext());
return;
}
done = true;
actual.onError(t);
}
@Override
public void onComplete() {
if (done) {
return;
}
done = true;
completePossiblyEmpty();
}
@Override
Boolean accumulatedValue() {
return false;
}
}
}