/**
* 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 via a predicate, returning the success item or completing if
* the predicate returns false.
*
* @param <T> the upstream value type
*/
public final class
MaybeFilter<T> extends
AbstractMaybeWithUpstream<T, T> {
final
Predicate<? super T>
predicate;
public
MaybeFilter(
MaybeSource<T>
source,
Predicate<? super T>
predicate) {
super(
source);
this.
predicate =
predicate;
}
@
Override
protected void
subscribeActual(
MaybeObserver<? super T>
observer) {
source.
subscribe(new
FilterMaybeObserver<T>(
observer,
predicate));
}
static final class
FilterMaybeObserver<T> implements
MaybeObserver<T>,
Disposable {
final
MaybeObserver<? super T>
downstream;
final
Predicate<? super T>
predicate;
Disposable upstream;
FilterMaybeObserver(
MaybeObserver<? super T>
actual,
Predicate<? super T>
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);
}
@
Override
public void
onComplete() {
downstream.
onComplete();
}
}
}