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.
/**
* 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.*;
import io.reactivex.functions.Function;
import io.reactivex.internal.disposables.DisposableHelper;
import io.reactivex.internal.functions.ObjectHelper;
Returns a value generated via a function if the main source signals an onError.
Type parameters: - <T> – the value type
/**
* Returns a value generated via a function if the main source signals an onError.
* @param <T> the value type
*/
public final class MaybeOnErrorReturn<T> extends AbstractMaybeWithUpstream<T, T> {
final Function<? super Throwable, ? extends T> valueSupplier;
public MaybeOnErrorReturn(MaybeSource<T> source,
Function<? super Throwable, ? extends T> valueSupplier) {
super(source);
this.valueSupplier = valueSupplier;
}
@Override
protected void subscribeActual(MaybeObserver<? super T> observer) {
source.subscribe(new OnErrorReturnMaybeObserver<T>(observer, valueSupplier));
}
static final class OnErrorReturnMaybeObserver<T> implements MaybeObserver<T>, Disposable {
final MaybeObserver<? super T> downstream;
final Function<? super Throwable, ? extends T> valueSupplier;
Disposable upstream;
OnErrorReturnMaybeObserver(MaybeObserver<? super T> actual,
Function<? super Throwable, ? extends T> valueSupplier) {
this.downstream = actual;
this.valueSupplier = valueSupplier;
}
@Override
public void dispose() {
upstream.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) {
downstream.onSuccess(value);
}
@Override
public void onError(Throwable e) {
T v;
try {
v = ObjectHelper.requireNonNull(valueSupplier.apply(e), "The valueSupplier returned a null value");
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
downstream.onError(new CompositeException(e, ex));
return;
}
downstream.onSuccess(v);
}
@Override
public void onComplete() {
downstream.onComplete();
}
}
}