| /* |
| * Copyright (c) OSGi Alliance (2017, 2021). All Rights Reserved. |
| * |
| * 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 org.osgi.util.promise; |
| |
| import static java.util.Objects.requireNonNull; |
| |
| import java.lang.reflect.InvocationTargetException; |
| |
| import org.osgi.util.function.Consumer; |
| import org.osgi.util.function.Function; |
| import org.osgi.util.function.Predicate; |
| |
| /** |
| * Failed Promise implementation. |
| * <p> |
| * This class is not used directly by clients. Clients should use |
| * {@link PromiseFactory#failed(Throwable)} to create a failed {@link Promise}. |
| * |
| * @param <T> The result type associated with the Promise. |
| * @since 1.1 |
| * @ThreadSafe |
| * @author $Id$ |
| */ |
| final class FailedPromiseImpl<T> extends PromiseImpl<T> { |
| /** |
| * The failure of this failed Promise. |
| */ |
| private final Throwable fail; |
| |
| /** |
| * Initialize this failed Promise. |
| * |
| * @param fail The failure of this failed Promise. Must not be {@code null}. |
| * @param factory The factory to use for callbacks and scheduled operations. |
| */ |
| FailedPromiseImpl(Throwable fail, PromiseFactory factory) { |
| super(factory); |
| this.fail = requireNonNull(fail); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public boolean isDone() { |
| return true; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public T getValue() throws InvocationTargetException { |
| throw new InvocationTargetException(fail); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public Throwable getFailure() { |
| return fail; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| Result<T> collect() { |
| return new Result<>(fail); |
| } |
| |
| @Override |
| public String toString() { |
| return super.toString() + "[failed: " + fail + "]"; |
| } |
| |
| /** |
| * Coerce the value type of this FailedPromiseImpl. |
| * |
| * @return This FailedPromiseImpl. |
| */ |
| @SuppressWarnings("unchecked") |
| private <V> FailedPromiseImpl<V> coerce() { |
| return (FailedPromiseImpl<V>) this; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public Promise<T> onSuccess(Consumer< ? super T> success) { |
| requireNonNull(success); |
| return this; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public <R> Promise<R> then(Success< ? super T, ? extends R> success, |
| Failure failure) { |
| if (failure == null) { |
| return coerce(); |
| } |
| return super.then(success, failure); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public Promise<T> thenAccept(Consumer< ? super T> consumer) { |
| requireNonNull(consumer); |
| return this; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public Promise<T> filter(Predicate< ? super T> predicate) { |
| requireNonNull(predicate); |
| return this; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public <R> Promise<R> map(Function< ? super T, ? extends R> mapper) { |
| requireNonNull(mapper); |
| return coerce(); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public <R> Promise<R> flatMap( |
| Function< ? super T,Promise< ? extends R>> mapper) { |
| requireNonNull(mapper); |
| return coerce(); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public Promise<T> timeout(long millis) { |
| return this; |
| } |
| } |