content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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 org.apache.beam.learning.katas.coretransforms.composite;
  
  // beam-playground:
  //   name: CompositeTransform
  //   description: Task from katas to implement a composite transform "ExtractAndMultiplyNumbers"
  //     that extracts numbers from comma separated line and then multiplies each number by 10.
  //   multifile: false
  //   context_line: 54
  //   categories:
  //     - Combiners
  //     - Flatten
  //     - Core Transforms
  //   complexity: BASIC
  //   tags:
  //     - count
  //     - map
  //     - transforms
  //     - numbers
  
  import static org.apache.beam.sdk.values.TypeDescriptors.integers;
  
  import java.util.Arrays;
  import org.apache.beam.learning.katas.util.Log;
  import org.apache.beam.sdk.Pipeline;
  import org.apache.beam.sdk.options.PipelineOptions;
  import org.apache.beam.sdk.options.PipelineOptionsFactory;
  import org.apache.beam.sdk.transforms.Create;
  import org.apache.beam.sdk.transforms.DoFn;
  import org.apache.beam.sdk.transforms.MapElements;
  import org.apache.beam.sdk.transforms.PTransform;
  import org.apache.beam.sdk.transforms.ParDo;
  import org.apache.beam.sdk.values.PCollection;
  
  public class Task {
  
    public static void main(String[] args) {
      PipelineOptions options = PipelineOptionsFactory.fromArgs(args).create();
      Pipeline pipeline = Pipeline.create(options);
  
      pipeline
          .apply(Create.of("1,2,3,4,5", "6,7,8,9,10"))
          .apply(new ExtractAndMultiplyNumbers())
          .apply(Log.ofElements());
  
      pipeline.run();
    }
  
    static class ExtractAndMultiplyNumbers
        extends PTransform<PCollection<String>, PCollection<Integer>> {
  
      @Override
      public PCollection<Integer> expand(PCollection<String> input) {
        return input
            .apply(ParDo.of(new DoFn<String, Integer>() {
  
              @ProcessElement
              public void processElement(@Element String numbers, OutputReceiver<Integer> out) {
                Arrays.stream(numbers.split(","))
                    .forEach(numStr -> out.output(Integer.parseInt(numStr)));
              }
  
            }))
  
            .apply(MapElements.into(integers()).via(number -> number * 10));
      }
  
    }
  }