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Contains com.google.common.util.concurrent.internal.InternalFutureFailureAccess and InternalFutures. Most users will never need to use this artifact. Its classes is conceptually a part of Guava, but they're in this separate artifact so that Android libraries can use them without pulling in all of Guava (just as they can use ListenableFuture by depending on the listenablefuture artifact).

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/*
 * 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.
 *
 * 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 optionally
   * 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:
   *
   * 

   *   {@code isDone()} must return {@code true}
   *   
{@code isCancelled()} must return {@code false}
   *   
{@code get()} must not block, and it must throw an {@code ExecutionException} with the
   *       return value of this method as its cause
   * 
   */
  public static Throwable tryInternalFastPathGetFailure(InternalFutureFailureAccess future) {
    return future.tryInternalFastPathGetFailure();
  }

  private InternalFutures() {}
}