/**
* 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.observable;
import io.reactivex.*;
import io.reactivex.annotations.
Nullable;
import io.reactivex.functions.
Predicate;
import io.reactivex.internal.observers.
BasicFuseableObserver;
public final class
ObservableFilter<T> extends
AbstractObservableWithUpstream<T, T> {
final
Predicate<? super T>
predicate;
public
ObservableFilter(
ObservableSource<T>
source,
Predicate<? super T>
predicate) {
super(
source);
this.
predicate =
predicate;
}
@
Override
public void
subscribeActual(
Observer<? super T>
observer) {
source.
subscribe(new
FilterObserver<T>(
observer,
predicate));
}
static final class
FilterObserver<T> extends
BasicFuseableObserver<T, T> {
final
Predicate<? super T>
filter;
FilterObserver(
Observer<? super T>
actual,
Predicate<? super T>
filter) {
super(
actual);
this.
filter =
filter;
}
@
Override
public void
onNext(T
t) {
if (
sourceMode ==
NONE) {
boolean
b;
try {
b =
filter.
test(
t);
} catch (
Throwable e) {
fail(
e);
return;
}
if (
b) {
downstream.
onNext(
t);
}
} else {
downstream.
onNext(null);
}
}
@
Override
public int
requestFusion(int
mode) {
return
transitiveBoundaryFusion(
mode);
}
@
Nullable
@
Override
public T
poll() throws
Exception {
for (;;) {
T
v =
qd.
poll();
if (
v == null ||
filter.
test(
v)) {
return
v;
}
}
}
}
}