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.annotations.Nullable;
  import io.reactivex.rxjava3.core.Flowable;
  import io.reactivex.rxjava3.exceptions.*;
  import io.reactivex.rxjava3.functions.*;
  import io.reactivex.rxjava3.internal.subscribers.*;
  import io.reactivex.rxjava3.internal.util.ExceptionHelper;
  import io.reactivex.rxjava3.operators.ConditionalSubscriber;
  import io.reactivex.rxjava3.plugins.RxJavaPlugins;
  
  public final class FlowableDoOnEach<T> extends AbstractFlowableWithUpstream<T, T> {
      final Consumer<? super T> onNext;
      final Consumer<? super Throwable> onError;
      final Action onComplete;
      final Action onAfterTerminate;
  
      public FlowableDoOnEach(Flowable<T> source, Consumer<? super T> onNext,
              Consumer<? super Throwable> onError,
              Action onComplete,
              Action onAfterTerminate) {
          super(source);
          this.onNext = onNext;
          this.onError = onError;
          this.onComplete = onComplete;
          this.onAfterTerminate = onAfterTerminate;
      }
  
      @Override
      protected void subscribeActual(Subscriber<? super T> s) {
          if (s instanceof ConditionalSubscriber) {
              source.subscribe(new DoOnEachConditionalSubscriber<>(
                      (ConditionalSubscriber<? super T>) s, onNext, onError, onComplete, onAfterTerminate));
          } else {
              source.subscribe(new DoOnEachSubscriber<>(
                      s, onNext, onError, onComplete, onAfterTerminate));
          }
      }
  
      static final class DoOnEachSubscriber<T> extends BasicFuseableSubscriber<T, T> {
          final Consumer<? super T> onNext;
          final Consumer<? super Throwable> onError;
          final Action onComplete;
          final Action onAfterTerminate;
  
          DoOnEachSubscriber(
                  Subscriber<? super T> actual,
                  Consumer<? super T> onNext,
                  Consumer<? super Throwable> onError,
                  Action onComplete,
                  Action onAfterTerminate) {
              super(actual);
              this.onNext = onNext;
              this.onError = onError;
              this.onComplete = onComplete;
              this.onAfterTerminate = onAfterTerminate;
          }
  
          @Override
          public void onNext(T t) {
              if (done) {
                  return;
              }
  
              if (sourceMode != NONE) {
                  downstream.onNext(null);
                  return;
              }
  
              try {
                  onNext.accept(t);
              } catch (Throwable e) {
                  fail(e);
                  return;
              }
  
              downstream.onNext(t);
          }
  
          @Override
          public void onError(Throwable t) {
              if (done) {
                  RxJavaPlugins.onError(t);
                  return;
              }
              done = true;
              boolean relay = true;
              try {
                  onError.accept(t);
              } catch (Throwable e) {
                  Exceptions.throwIfFatal(e);
                  downstream.onError(new CompositeException(t, e));
                  relay = false;
              }
              if (relay) {
                  downstream.onError(t);
              }
  
              try {
                  onAfterTerminate.run();
              } catch (Throwable e) {
                  Exceptions.throwIfFatal(e);
                  RxJavaPlugins.onError(e);
              }
          }
  
          @Override
          public void onComplete() {
              if (done) {
                  return;
              }
              try {
                  onComplete.run();
              } catch (Throwable e) {
                  fail(e);
                  return;
              }
  
              done = true;
              downstream.onComplete();
  
              try {
                  onAfterTerminate.run();
              } catch (Throwable e) {
                  Exceptions.throwIfFatal(e);
                  RxJavaPlugins.onError(e);
              }
          }
  
          @Override
          public int requestFusion(int mode) {
              return transitiveBoundaryFusion(mode);
          }
  
          @Nullable
          @Override
          public T poll() throws Throwable {
              T v;
  
              try {
                  v = qs.poll();
              } catch (Throwable ex) {
                  Exceptions.throwIfFatal(ex);
                  try {
                      onError.accept(ex);
                  } catch (Throwable exc) {
                      Exceptions.throwIfFatal(exc);
                      throw new CompositeException(ex, exc);
                  }
                  throw ExceptionHelper.<Exception>throwIfThrowable(ex);
              }
  
              if (v != null) {
                  try {
                      try {
                          onNext.accept(v);
                      } catch (Throwable ex) {
                          Exceptions.throwIfFatal(ex);
                          try {
                              onError.accept(ex);
                          } catch (Throwable exc) {
                              Exceptions.throwIfFatal(exc);
                              throw new CompositeException(ex, exc);
                          }
                          throw ExceptionHelper.<Exception>throwIfThrowable(ex);
                      }
                  } finally {
                      onAfterTerminate.run();
                  }
              } else {
                  if (sourceMode == SYNC) {
                      onComplete.run();
  
                      onAfterTerminate.run();
                  }
              }
              return v;
          }
      }
  
      static final class DoOnEachConditionalSubscriber<T> extends BasicFuseableConditionalSubscriber<T, T> {
          final Consumer<? super T> onNext;
          final Consumer<? super Throwable> onError;
          final Action onComplete;
          final Action onAfterTerminate;
  
          DoOnEachConditionalSubscriber(
                  ConditionalSubscriber<? super T> actual,
                  Consumer<? super T> onNext,
                  Consumer<? super Throwable> onError,
                  Action onComplete,
                  Action onAfterTerminate) {
              super(actual);
              this.onNext = onNext;
              this.onError = onError;
              this.onComplete = onComplete;
              this.onAfterTerminate = onAfterTerminate;
          }
  
          @Override
          public void onNext(T t) {
              if (done) {
                  return;
              }
  
              if (sourceMode != NONE) {
                  downstream.onNext(null);
                  return;
              }
  
              try {
                  onNext.accept(t);
              } catch (Throwable e) {
                  fail(e);
                  return;
              }
  
              downstream.onNext(t);
          }
  
          @Override
          public boolean tryOnNext(T t) {
              if (done) {
                  return false;
              }
  
              try {
                  onNext.accept(t);
              } catch (Throwable e) {
                  fail(e);
                  return false;
              }
  
              return downstream.tryOnNext(t);
          }
  
          @Override
          public void onError(Throwable t) {
              if (done) {
                  RxJavaPlugins.onError(t);
                  return;
              }
              done = true;
              boolean relay = true;
              try {
                  onError.accept(t);
              } catch (Throwable e) {
                  Exceptions.throwIfFatal(e);
                  downstream.onError(new CompositeException(t, e));
                  relay = false;
              }
              if (relay) {
                  downstream.onError(t);
              }
  
              try {
                  onAfterTerminate.run();
              } catch (Throwable e) {
                  Exceptions.throwIfFatal(e);
                  RxJavaPlugins.onError(e);
              }
          }
  
          @Override
          public void onComplete() {
              if (done) {
                  return;
              }
              try {
                  onComplete.run();
              } catch (Throwable e) {
                  fail(e);
                  return;
              }
  
              done = true;
              downstream.onComplete();
  
              try {
                  onAfterTerminate.run();
              } catch (Throwable e) {
                  Exceptions.throwIfFatal(e);
                  RxJavaPlugins.onError(e);
              }
          }
  
          @Override
          public int requestFusion(int mode) {
              return transitiveBoundaryFusion(mode);
          }
  
          @Nullable
          @Override
          public T poll() throws Throwable {
              T v;
  
              try {
                  v = qs.poll();
              } catch (Throwable ex) {
                  Exceptions.throwIfFatal(ex);
                  try {
                      onError.accept(ex);
                  } catch (Throwable exc) {
                      Exceptions.throwIfFatal(exc);
                      throw new CompositeException(ex, exc);
                  }
                  throw ExceptionHelper.<Exception>throwIfThrowable(ex);
              }
  
              if (v != null) {
                  try {
                      try {
                          onNext.accept(v);
                      } catch (Throwable ex) {
                          Exceptions.throwIfFatal(ex);
                          try {
                              onError.accept(ex);
                          } catch (Throwable exc) {
                              Exceptions.throwIfFatal(exc);
                              throw new CompositeException(ex, exc);
                          }
                          throw ExceptionHelper.<Exception>throwIfThrowable(ex);
                      }
                  } finally {
                      onAfterTerminate.run();
                  }
              } else {
                  if (sourceMode == SYNC) {
                      onComplete.run();
  
                      onAfterTerminate.run();
                  }
              }
              return v;
          }
      }
  }
  