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.*;
  
  import io.reactivex.rxjava3.core.Flowable;
  import io.reactivex.rxjava3.functions.Function;
  import io.reactivex.rxjava3.internal.operators.flowable.FlowableMap.MapSubscriber;
  
  /**
   * Map working with an arbitrary Publisher source.
   * <p>History: 2.0.7 - experimental
   * @param <T> the input value type
   * @param <U> the output value type
   * @since 2.1
   */
  public final class FlowableMapPublisher<T, U> extends Flowable<U> {
  
      final Publisher<T> source;
  
      final Function<? super T, ? extends U> mapper;
      public FlowableMapPublisher(Publisher<T> source, Function<? super T, ? extends U> mapper) {
          this.source = source;
          this.mapper = mapper;
      }
  
      @Override
      protected void subscribeActual(Subscriber<? super U> s) {
          source.subscribe(new MapSubscriber<T, U>(s, mapper));
      }
  }
  