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.observable;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.internal.operators.observable.ObservableScalarXMap.ScalarDisposable;
  import io.reactivex.rxjava3.operators.ScalarSupplier;
  
  /**
   * Represents a constant scalar value.
   * @param <T> the value type
   */
  public final class ObservableJust<T> extends Observable<T> implements ScalarSupplier<T> {
  
      private final T value;
      public ObservableJust(final T value) {
          this.value = value;
      }
  
      @Override
      protected void subscribeActual(Observer<? super T> observer) {
          ScalarDisposable<T> sd = new ScalarDisposable<>(observer, value);
          observer.onSubscribe(sd);
          sd.run();
      }
  
      @Override
      public T get() {
          return value;
      }
  }
  