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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 java.util.concurrent.atomic.*;
import io.reactivex.*;
import io.reactivex.disposables.Disposable;
import io.reactivex.exceptions.Exceptions;
import io.reactivex.functions.BiPredicate;
import io.reactivex.internal.disposables.DisposableHelper;
import io.reactivex.plugins.RxJavaPlugins;
/**
* Compares two MaybeSources to see if they are both empty or emit the same value compared
* via a BiPredicate.
*
* @param the common base type of the sources
*/
public final class MaybeEqualSingle extends Single {
final MaybeSource extends T> source1;
final MaybeSource extends T> source2;
final BiPredicate super T, ? super T> isEqual;
public MaybeEqualSingle(MaybeSource extends T> source1, MaybeSource extends T> source2,
BiPredicate super T, ? super T> isEqual) {
this.source1 = source1;
this.source2 = source2;
this.isEqual = isEqual;
}
@Override
protected void subscribeActual(SingleObserver super Boolean> observer) {
EqualCoordinator parent = new EqualCoordinator(observer, isEqual);
observer.onSubscribe(parent);
parent.subscribe(source1, source2);
}
@SuppressWarnings("serial")
static final class EqualCoordinator
extends AtomicInteger
implements Disposable {
final SingleObserver super Boolean> downstream;
final EqualObserver observer1;
final EqualObserver observer2;
final BiPredicate super T, ? super T> isEqual;
EqualCoordinator(SingleObserver super Boolean> actual, BiPredicate super T, ? super T> isEqual) {
super(2);
this.downstream = actual;
this.isEqual = isEqual;
this.observer1 = new EqualObserver(this);
this.observer2 = new EqualObserver(this);
}
void subscribe(MaybeSource extends T> source1, MaybeSource extends T> source2) {
source1.subscribe(observer1);
source2.subscribe(observer2);
}
@Override
public void dispose() {
observer1.dispose();
observer2.dispose();
}
@Override
public boolean isDisposed() {
return DisposableHelper.isDisposed(observer1.get());
}
@SuppressWarnings("unchecked")
void done() {
if (decrementAndGet() == 0) {
Object o1 = observer1.value;
Object o2 = observer2.value;
if (o1 != null && o2 != null) {
boolean b;
try {
b = isEqual.test((T)o1, (T)o2);
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
downstream.onError(ex);
return;
}
downstream.onSuccess(b);
} else {
downstream.onSuccess(o1 == null && o2 == null);
}
}
}
void error(EqualObserver sender, Throwable ex) {
if (getAndSet(0) > 0) {
if (sender == observer1) {
observer2.dispose();
} else {
observer1.dispose();
}
downstream.onError(ex);
} else {
RxJavaPlugins.onError(ex);
}
}
}
static final class EqualObserver
extends AtomicReference
implements MaybeObserver {
private static final long serialVersionUID = -3031974433025990931L;
final EqualCoordinator parent;
Object value;
EqualObserver(EqualCoordinator parent) {
this.parent = parent;
}
public void dispose() {
DisposableHelper.dispose(this);
}
@Override
public void onSubscribe(Disposable d) {
DisposableHelper.setOnce(this, d);
}
@Override
public void onSuccess(T value) {
this.value = value;
parent.done();
}
@Override
public void onError(Throwable e) {
parent.error(this, e);
}
@Override
public void onComplete() {
parent.done();
}
}
}
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