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.operators.flowable;
  
  import org.reactivestreams.Subscriber;
  
  import io.reactivex.rxjava3.core.Flowable;
  import io.reactivex.rxjava3.internal.subscriptions.EmptySubscription;
  import io.reactivex.rxjava3.operators.ScalarSupplier;
  
  /**
   * A source Flowable that signals an onSubscribe() + onComplete() only.
   */
  public final class FlowableEmpty extends Flowable<Object> implements ScalarSupplier<Object> {
  
      public static final Flowable<Object> INSTANCE = new FlowableEmpty();
  
      private FlowableEmpty() {
      }
  
      @Override
      public void subscribeActual(Subscriber<? super Object> s) {
          EmptySubscription.complete(s);
      }
  
      @Override
      public Object get() {
          return null; // null scalar is interpreted as being empty
      }
  }
  