io.reactivex.internal.operators.maybe.MaybeFilterSingle Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of rxjava Show documentation
Show all versions of rxjava Show documentation
Reactive Extensions for Java
/**
* Copyright (c) 2016-present, RxJava Contributors.
*
* 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 io.reactivex.internal.operators.maybe;
import io.reactivex.*;
import io.reactivex.disposables.Disposable;
import io.reactivex.exceptions.Exceptions;
import io.reactivex.functions.Predicate;
import io.reactivex.internal.disposables.DisposableHelper;
/**
* Filters the upstream SingleSource via a predicate, returning the success item or completing if
* the predicate returns false.
*
* @param the upstream value type
*/
public final class MaybeFilterSingle extends Maybe {
final SingleSource source;
final Predicate predicate;
public MaybeFilterSingle(SingleSource source, Predicate predicate) {
this.source = source;
this.predicate = predicate;
}
@Override
protected void subscribeActual(MaybeObserver observer) {
source.subscribe(new FilterMaybeObserver(observer, predicate));
}
static final class FilterMaybeObserver implements SingleObserver, Disposable {
final MaybeObserver downstream;
final Predicate predicate;
Disposable upstream;
FilterMaybeObserver(MaybeObserver actual, Predicate predicate) {
this.downstream = actual;
this.predicate = predicate;
}
@Override
public void dispose() {
Disposable d = this.upstream;
this.upstream = DisposableHelper.DISPOSED;
d.dispose();
}
@Override
public boolean isDisposed() {
return upstream.isDisposed();
}
@Override
public void onSubscribe(Disposable d) {
if (DisposableHelper.validate(this.upstream, d)) {
this.upstream = d;
downstream.onSubscribe(this);
}
}
@Override
public void onSuccess(T value) {
boolean b;
try {
b = predicate.test(value);
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
downstream.onError(ex);
return;
}
if (b) {
downstream.onSuccess(value);
} else {
downstream.onComplete();
}
}
@Override
public void onError(Throwable e) {
downstream.onError(e);
}
}
}