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.completable;
  
  import java.util.concurrent.atomic.AtomicInteger;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.disposables.*;
  import io.reactivex.rxjava3.internal.util.AtomicThrowable;
  
  public final class CompletableMergeArrayDelayError extends Completable {
  
      final CompletableSource[] sources;
  
      public CompletableMergeArrayDelayError(CompletableSource[] sources) {
          this.sources = sources;
      }
  
      @Override
      public void subscribeActual(final CompletableObserver observer) {
          final CompositeDisposable set = new CompositeDisposable();
          final AtomicInteger wip = new AtomicInteger(sources.length + 1);
  
          final AtomicThrowable errors = new AtomicThrowable();
          set.add(new TryTerminateAndReportDisposable(errors));
  
          observer.onSubscribe(set);
  
          for (CompletableSource c : sources) {
              if (set.isDisposed()) {
                  return;
              }
  
              if (c == null) {
                  Throwable ex = new NullPointerException("A completable source is null");
                  errors.tryAddThrowableOrReport(ex);
                  wip.decrementAndGet();
                  continue;
              }
  
              c.subscribe(new MergeInnerCompletableObserver(observer, set, errors, wip));
          }
  
          if (wip.decrementAndGet() == 0) {
              errors.tryTerminateConsumer(observer);
          }
      }
  
      static final class TryTerminateAndReportDisposable implements Disposable {
          final AtomicThrowable errors;
          TryTerminateAndReportDisposable(AtomicThrowable errors) {
              this.errors = errors;
          }
  
          @Override
          public void dispose() {
              errors.tryTerminateAndReport();
          }
  
          @Override
          public boolean isDisposed() {
              return errors.isTerminated();
          }
      }
  
      static final class MergeInnerCompletableObserver
      implements CompletableObserver {
          final CompletableObserver downstream;
          final CompositeDisposable set;
          final AtomicThrowable errors;
          final AtomicInteger wip;
  
          MergeInnerCompletableObserver(CompletableObserver observer, CompositeDisposable set, AtomicThrowable error,
                  AtomicInteger wip) {
              this.downstream = observer;
              this.set = set;
              this.errors = error;
              this.wip = wip;
          }
  
          @Override
          public void onSubscribe(Disposable d) {
              set.add(d);
          }
  
          @Override
          public void onError(Throwable e) {
              if (errors.tryAddThrowableOrReport(e)) {
                  tryTerminate();
              }
          }
  
          @Override
          public void onComplete() {
              tryTerminate();
          }
  
          void tryTerminate() {
              if (wip.decrementAndGet() == 0) {
                  errors.tryTerminateConsumer(downstream);
              }
          }
      }
  }
  