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.maybe;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.internal.disposables.EmptyDisposable;
  import io.reactivex.rxjava3.operators.ScalarSupplier;
  
  /**
   * Signals an onComplete.
   */
  public final class MaybeEmpty extends Maybe<Object> implements ScalarSupplier<Object> {
  
      public static final MaybeEmpty INSTANCE = new MaybeEmpty();
  
      @Override
      protected void subscribeActual(MaybeObserver<? super Object> observer) {
          EmptyDisposable.complete(observer);
      }
  
      @Override
      public Object get() {
          return null; // nulls of ScalarCallable are considered empty sources
      }
  }
  