content: /*
   * Copyright (C) 2020 ActiveJ LLC.
   *
   * 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.activej.datastream.processor.transformer;
  
  import io.activej.datastream.consumer.StreamConsumer;
  import io.activej.datastream.dsl.HasStreamInput;
  import io.activej.datastream.dsl.HasStreamOutput;
  import io.activej.datastream.supplier.StreamSupplier;
  import io.activej.reactor.Reactive;
  
  /**
   * A bidirectional stream transformer capable of transforming both
   * {@link StreamConsumer consumers} and {@link StreamSupplier suppliers}.
   *
   * @param <I> input elements type
   * @param <O> output elements type.
   */
  public interface StreamTransformer<I, O> extends Reactive,
  	HasStreamInput<I>, HasStreamOutput<O>,
  	StreamSupplierTransformer<I, StreamSupplier<O>>,
  	StreamConsumerTransformer<O, StreamConsumer<I>> {
  
  	@Override
  	default StreamConsumer<I> transform(StreamConsumer<O> consumer) {
  		getOutput().streamTo(consumer);
  		return getInput();
  	}
  
  	@Override
  	default StreamSupplier<O> transform(StreamSupplier<I> supplier) {
  		supplier.streamTo(getInput());
  		return getOutput();
  	}
  }
  