/**
* Copyright 2014 Netflix, Inc.
*
* 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 rx.internal.operators;
import rx.*;
import rx.
Observable.
Operator;
import rx.exceptions.
Exceptions;
import rx.functions.
Func1;
import rx.internal.producers.
SingleDelayedProducer;
import rx.plugins.
RxJavaHooks;
/**
* Returns an {@link Observable} that emits <code>true</code> if any element of
* an observable sequence satisfies a condition, otherwise <code>false</code>.
* @param <T> the input value type
*/
public final class
OperatorAny<T> implements
Operator<
Boolean, T> {
final
Func1<? super T,
Boolean>
predicate;
final boolean
returnOnEmpty;
public
OperatorAny(
Func1<? super T,
Boolean>
predicate, boolean
returnOnEmpty) {
this.
predicate =
predicate;
this.
returnOnEmpty =
returnOnEmpty;
}
@
Override
public
Subscriber<? super T>
call(final
Subscriber<? super
Boolean>
child) {
final
SingleDelayedProducer<
Boolean>
producer = new
SingleDelayedProducer<
Boolean>(
child);
Subscriber<T>
s = new
Subscriber<T>() {
boolean
hasElements;
boolean
done;
@
Override
public void
onNext(T
t) {
if (
done) {
return;
}
hasElements = true;
boolean
result;
try {
result =
predicate.
call(
t);
} catch (
Throwable e) {
Exceptions.
throwOrReport(
e, this,
t);
return;
}
if (
result) {
done = true;
producer.
setValue(!
returnOnEmpty);
unsubscribe();
}
// note that don't need to request more of upstream because this subscriber
// defaults to requesting Long.MAX_VALUE
}
@
Override
public void
onError(
Throwable e) {
if (!
done) {
done = true;
child.
onError(
e);
} else {
RxJavaHooks.
onError(
e);
}
}
@
Override
public void
onCompleted() {
if (!
done) {
done = true;
if (
hasElements) {
producer.
setValue(false);
} else {
producer.
setValue(
returnOnEmpty);
}
}
}
};
child.
add(
s);
child.
setProducer(
producer);
return
s;
}
}