content: /*
   * Copyright 2019 The Android Open Source Project
   *
   * 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 androidx.test.espresso.web.util.concurrent;
  
  import androidx.annotation.NonNull;
  import androidx.annotation.Nullable;
  import com.google.common.util.concurrent.ListenableFuture;
  import java.util.concurrent.Executor;
  import java.util.concurrent.Future;
  
  /**
   * Forked from androidx.camera package to avoid full guava dependency.
   *
   * <p>Transforms a value, possibly asynchronously. For an example usage and more information, see
   * {@link Futures#transformAsync(ListenableFuture, AsyncFunction, Executor)}.
   *
   * @author Chris Povirk
   * @since 11.0
   * @param <I>
   * @param <O>
   */
  public interface AsyncFunction<I, O> {
    /**
     * Returns an output {@code Future} to use in place of the given {@code input}. The output {@code
     * Future} need not be {@linkplain Future#isDone done}, making {@code AsyncFunction} suitable for
     * asynchronous derivations.
     *
     * <p>Throwing an exception from this method is equivalent to returning a failing {@code Future}.
     */
    @NonNull
    ListenableFuture<O> apply(@Nullable I input) throws Exception;
  }
  