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(); } } }