| /* |
| * Copyright (C) 2018 The Guava Authors |
| * |
| * 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 com.google.common.util.concurrent.internal; |
| |
| /** |
| * Static utilities for {@link InternalFutureFailureAccess}. Most users will never need to use this |
| * class. |
| * |
| * <p>This class is GWT-compatible. |
| * |
| * @since {@code com.google.guava:failureaccess:1.0}, which was added as a dependency of Guava in |
| * Guava 27.0 |
| */ |
| public final class InternalFutures { |
| /** |
| * Usually returns {@code null} but, if the given {@code Future} has failed, may <i>optionally</i> |
| * return the cause of the failure. "Failure" means specifically "completed with an exception"; it |
| * does not include "was cancelled." To be explicit: If this method returns a non-null value, |
| * then: |
| * |
| * <ul> |
| * <li>{@code isDone()} must return {@code true} |
| * <li>{@code isCancelled()} must return {@code false} |
| * <li>{@code get()} must not block, and it must throw an {@code ExecutionException} with the |
| * return value of this method as its cause |
| * </ul> |
| */ |
| public static Throwable tryInternalFastPathGetFailure(InternalFutureFailureAccess future) { |
| return future.tryInternalFastPathGetFailure(); |
| } |
| |
| private InternalFutures() {} |
| } |