code: /*
   * Copyright (c) 2016-present, RxJava Contributors.
   *
   * 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 io.reactivex.rxjava3.internal.schedulers;
  
  import java.util.concurrent.*;
  
  import io.reactivex.rxjava3.annotations.NonNull;
  import io.reactivex.rxjava3.disposables.Disposable;
  
  /**
   * Implements the Future interface and calls dispose() on cancel() but
   * the other methods are not implemented.
   */
  final class DisposeOnCancel implements Future<Object> {
  
      final Disposable upstream;
  
      DisposeOnCancel(Disposable d) {
          this.upstream = d;
      }
  
      @Override
      public boolean cancel(boolean mayInterruptIfRunning) {
          upstream.dispose();
          return false;
      }
  
      @Override
      public boolean isCancelled() {
          return false;
      }
  
      @Override
      public boolean isDone() {
          return false;
      }
  
      @Override
      public Object get() {
          return null;
      }
  
      @Override
      public Object get(long timeout, @NonNull TimeUnit unit) {
          return null;
      }
  }
  