content: /*
   * Copyright (C) 2022 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.util.concurrent;
  
  import androidx.annotation.RestrictTo;
  import androidx.annotation.RestrictTo.Scope;
  import com.google.common.util.concurrent.ListenableFuture;
  import java.util.concurrent.Callable;
  import java.util.concurrent.Executor;
  import java.util.concurrent.FutureTask;
  
  /**
   * Minimal fork of Guava's ListenableFutureTask to avoid the full dependency.
   *
   * @hide
   */
  @RestrictTo(Scope.LIBRARY)
  public class ListenableFutureTask<V> extends FutureTask<V> implements ListenableFuture<V> {
  
    // The execution list to hold our listeners.
    private final ExecutionList executionList = new ExecutionList();
  
    /**
     * Creates a {@code ListenableFutureTask} that will upon running, execute the given {@code
     * Callable}.
     *
     * @param callable the callable task
     */
    public static <V> ListenableFutureTask<V> create(Callable<V> callable) {
      return new ListenableFutureTask<>(callable);
    }
  
    protected ListenableFutureTask(Callable<V> callable) {
      super(callable);
    }
  
    @Override
    public void addListener(Runnable listener, Executor exec) {
      executionList.add(listener, exec);
    }
  
    /** Internal implementation detail used to invoke the listeners. */
    @Override
    protected void done() {
      executionList.execute();
    }
  }
  