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.jdk8;
  
  import java.util.NoSuchElementException;
  
  import org.reactivestreams.Subscription;
  
  /**
   * Signals the last element of the source via the underlying CompletableFuture,
   * signals the a default item if the upstream is empty or signals {@link NoSuchElementException}.
   *
   * @param <T> the element type
   * @since 3.0.0
   */
  public final class FlowableLastStageSubscriber<T> extends FlowableStageSubscriber<T> {
  
      final boolean hasDefault;
  
      final T defaultItem;
  
      public FlowableLastStageSubscriber(boolean hasDefault, T defaultItem) {
          this.hasDefault = hasDefault;
          this.defaultItem = defaultItem;
      }
  
      @Override
      public void onNext(T t) {
          value = t;
      }
  
      @Override
      public void onComplete() {
          if (!isDone()) {
              T v = value;
              clear();
              if (v != null) {
                  complete(v);
              } else if (hasDefault) {
                  complete(defaultItem);
              } else {
                  completeExceptionally(new NoSuchElementException());
              }
          }
      }
  
      @Override
      protected void afterSubscribe(Subscription s) {
          s.request(Long.MAX_VALUE);
      }
  
  }
  