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.carbondata.sdk.file;
  
  import java.io.DataInputStream;
  import java.io.FileNotFoundException;
  import java.io.IOException;
  import java.util.Random;
  import java.util.UUID;
  
  import org.apache.carbondata.common.annotations.InterfaceAudience;
  import org.apache.carbondata.core.datastore.filesystem.CarbonFile;
  import org.apache.carbondata.core.datastore.impl.FileFactory;
  import org.apache.carbondata.hadoop.api.CarbonTableOutputFormat;
  import org.apache.carbondata.hadoop.internal.ObjectArrayWritable;
  import org.apache.carbondata.processing.loading.csvinput.CSVInputFormat;
  import org.apache.carbondata.processing.loading.model.CarbonLoadModel;
  
  import com.univocity.parsers.csv.CsvParser;
  import com.univocity.parsers.csv.CsvParserSettings;
  import org.apache.hadoop.conf.Configuration;
  import org.apache.hadoop.io.NullWritable;
  import org.apache.hadoop.mapreduce.JobID;
  import org.apache.hadoop.mapreduce.RecordWriter;
  import org.apache.hadoop.mapreduce.TaskAttemptContext;
  import org.apache.hadoop.mapreduce.TaskAttemptID;
  import org.apache.hadoop.mapreduce.TaskID;
  import org.apache.hadoop.mapreduce.TaskType;
  import org.apache.hadoop.mapreduce.task.TaskAttemptContextImpl;
  
  /**
   * Implementation to write rows in CSV format to carbondata file.
   */
  @InterfaceAudience.Internal
  class CSVCarbonWriter extends CarbonWriter {
  
    private Configuration configuration;
    private RecordWriter<NullWritable, ObjectArrayWritable> recordWriter;
    private TaskAttemptContext context;
    private ObjectArrayWritable writable;
    private CsvParser csvParser = null;
    private boolean skipHeader = false;
    private CarbonFile[] dataFiles;
  
    CSVCarbonWriter(CarbonLoadModel loadModel, Configuration hadoopConf) throws IOException {
      CarbonTableOutputFormat.setLoadModel(hadoopConf, loadModel);
      CarbonTableOutputFormat format = new CarbonTableOutputFormat();
      JobID jobId = new JobID(UUID.randomUUID().toString(), 0);
      Random random = new Random();
      TaskID task = new TaskID(jobId, TaskType.MAP, random.nextInt());
      TaskAttemptID attemptId = new TaskAttemptID(task, random.nextInt());
      TaskAttemptContextImpl context = new TaskAttemptContextImpl(hadoopConf, attemptId);
      this.recordWriter = format.getRecordWriter(context);
      this.context = context;
      this.writable = new ObjectArrayWritable();
      this.configuration = hadoopConf;
    }
  
    public void setSkipHeader(boolean skipHeader) {
      this.skipHeader = skipHeader;
    }
  
    /**
     * Write single row data, input row is of type String[]
     */
    @Override
    public void write(Object object) throws IOException {
      try {
        writable.set((Object[]) object);
        recordWriter.write(NullWritable.get(), writable);
      } catch (Exception e) {
        throw new IOException(e);
      }
    }
  
    private CsvParser buildCsvParser(Configuration conf) {
      CsvParserSettings settings = CSVInputFormat.extractCsvParserSettings(conf);
      return new CsvParser(settings);
    }
  
    @Override
    public void setDataFiles(CarbonFile[] dataFiles) throws IOException {
      if (dataFiles == null || dataFiles.length == 0) {
        throw new RuntimeException("data files can't be empty.");
      }
      DataInputStream csvInputStream = null;
      CsvParser csvParser = this.buildCsvParser(this.configuration);
      for (CarbonFile dataFile : dataFiles) {
        try {
          csvInputStream = FileFactory.getDataInputStream(dataFile.getPath(),
              -1, this.configuration);
          csvParser.beginParsing(csvInputStream);
        } catch (IllegalArgumentException ex) {
          if (ex.getCause() instanceof FileNotFoundException) {
            throw new FileNotFoundException("File " + dataFile +
                " not found to build carbon writer.");
          }
          throw ex;
        } finally {
          if (csvInputStream != null) {
            csvInputStream.close();
          }
        }
      }
      this.dataFiles = dataFiles;
    }
  
    /**
     * Load data of all or selected csv files at given location iteratively.
     *
     * @throws IOException
     */
    @Override
    public void write() throws IOException {
      if (this.dataFiles == null || this.dataFiles.length == 0) {
        throw new RuntimeException("'withCsvPath()' must be called to support load files");
      }
      this.csvParser = this.buildCsvParser(this.configuration);
      for (CarbonFile dataFile : this.dataFiles) {
        this.loadSingleFile(dataFile);
      }
    }
  
    private void loadSingleFile(CarbonFile file) throws IOException {
      DataInputStream csvDataInputStream = FileFactory
          .getDataInputStream(file.getPath(), -1, this.configuration);
      this.csvParser.beginParsing(csvDataInputStream);
      String[] row;
      boolean skipFirstRow = this.skipHeader;
      try {
        while ((row = this.csvParser.parseNext()) != null) {
          if (skipFirstRow) {
            skipFirstRow = false;
            continue;
          }
          this.write(row);
        }
      } finally {
        if (csvDataInputStream != null) {
          csvDataInputStream.close();
        }
      }
    }
  
    /**
     * Flush and close the writer
     */
    @Override
    public void close() throws IOException {
      try {
        recordWriter.close(context);
      } catch (InterruptedException e) {
        throw new IOException(e);
      }
    }
  }
  