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.sdk.tpcds;
  
  import static org.apache.beam.sdk.extensions.sql.impl.schema.BeamTableUtils.beamRow2CsvLine;
  
  import java.io.Serializable;
  import org.apache.beam.sdk.transforms.MapElements;
  import org.apache.beam.sdk.transforms.PTransform;
  import org.apache.beam.sdk.values.PCollection;
  import org.apache.beam.sdk.values.Row;
  import org.apache.beam.sdk.values.TypeDescriptors;
  import org.apache.commons.csv.CSVFormat;
  
  /**
   * A writeConverter class for TextTable that can transform PCollection<Row> into
   * PCollection<String>, the format of string is determined by CSVFormat.
   */
  public class RowToCsv extends PTransform<PCollection<Row>, PCollection<String>>
      implements Serializable {
    private final CSVFormat csvFormat;
  
    public RowToCsv(CSVFormat csvFormat) {
      this.csvFormat = csvFormat;
    }
  
    public CSVFormat getCsvFormat() {
      return csvFormat;
    }
  
    @Override
    public PCollection<String> expand(PCollection<Row> input) {
      return input.apply(
          "rowToCsv",
          MapElements.into(TypeDescriptors.strings()).via(row -> beamRow2CsvLine(row, csvFormat)));
    }
  }
  