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 java.util.*;
  
  import io.reactivex.rxjava3.core.Observable;
  import io.reactivex.rxjava3.core.Observer;
  import io.reactivex.rxjava3.disposables.Disposable;
  
  /**
   * Creates {@link Observable} of a number of items followed by either an error or
   * completion. Subscription status is not checked before emitting an event.
   *
   * @param <T> the value type
   */
  public final class Burst<T> extends Observable<T> {
  
      final List<T> items;
      final Throwable error;
  
      Burst(Throwable error, List<T> items) {
          this.error = error;
          this.items = items;
      }
  
      @Override
      protected void subscribeActual(final Observer<? super T> observer) {
          observer.onSubscribe(Disposable.empty());
          for (T item: items) {
              observer.onNext(item);
          }
          if (error != null) {
              observer.onError(error);
          } else {
              observer.onComplete();
          }
      }
  
      public static <T> Builder<T> item(T item) {
          return items(item);
      }
  
      @SafeVarargs
      public static <T> Builder<T> items(T... items) {
          return new Builder<>(Arrays.asList(items));
      }
  
      public static final class Builder<T> {
  
          private final List<T> items;
          private Throwable error;
  
          Builder(List<T> items) {
              this.items = items;
          }
  
          public Observable<T> error(Throwable e) {
              this.error = e;
              return create();
          }
  
          public Observable<T> create() {
              return new Burst<>(error, items);
          }
  
      }
  
  }
  