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67 lines
2.0 KiB
67 lines
2.0 KiB
/*
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* Copyright (C) 2014 The Dagger Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package dagger.producers;
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import com.google.common.util.concurrent.Futures;
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import com.google.common.util.concurrent.ListenableFuture;
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import dagger.internal.Beta;
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import dagger.producers.internal.CancellableProducer;
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import dagger.producers.internal.CancellationListener;
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/** Utility methods to create {@link Producer}s. */
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@Beta
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public final class Producers {
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/** Returns a producer that succeeds with the given value. */
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public static <T> Producer<T> immediateProducer(final T value) {
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return new ImmediateProducer<>(Futures.immediateFuture(value));
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}
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/** Returns a producer that fails with the given exception. */
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public static <T> Producer<T> immediateFailedProducer(final Throwable throwable) {
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return new ImmediateProducer<>(Futures.<T>immediateFailedFuture(throwable));
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}
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/** A {@link CancellableProducer} with an immediate result. */
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private static final class ImmediateProducer<T> implements CancellableProducer<T> {
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private final ListenableFuture<T> future;
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ImmediateProducer(ListenableFuture<T> future) {
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this.future = future;
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}
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@Override
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public ListenableFuture<T> get() {
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return future;
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}
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@Override
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public void cancel(boolean mayInterruptIfRunning) {}
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@Override
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public Producer<T> newDependencyView() {
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return this;
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}
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@Override
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public Producer<T> newEntryPointView(CancellationListener cancellationListener) {
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return this;
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}
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}
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private Producers() {}
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}
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