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.processing.loading.steps;
  
  import java.io.IOException;
  import java.util.Iterator;
  
  import org.apache.carbondata.processing.loading.AbstractDataLoadProcessorStep;
  import org.apache.carbondata.processing.loading.CarbonDataLoadConfiguration;
  import org.apache.carbondata.processing.loading.exception.CarbonDataLoadingException;
  import org.apache.carbondata.processing.loading.row.CarbonRowBatch;
  import org.apache.carbondata.processing.loading.sort.Sorter;
  import org.apache.carbondata.processing.loading.sort.SorterFactory;
  import org.apache.carbondata.processing.sort.sortdata.SortParameters;
  
  /**
   * It sorts the data and write them to intermediate temp files. These files will be further read
   * by next step for writing to carbondata files.
   */
  public class SortProcessorStepImpl extends AbstractDataLoadProcessorStep {
  
    private Sorter sorter;
  
    public SortProcessorStepImpl(CarbonDataLoadConfiguration configuration,
        AbstractDataLoadProcessorStep child) {
      super(configuration, child);
    }
  
    @Override
    public void initialize() throws IOException {
      super.initialize();
      child.initialize();
      SortParameters sortParameters = SortParameters.createSortParameters(configuration);
      sorter = SorterFactory.createSorter(configuration, rowCounter);
      sorter.initialize(sortParameters);
    }
  
    @Override
    public Iterator<CarbonRowBatch>[] execute() throws CarbonDataLoadingException {
      final Iterator<CarbonRowBatch>[] iterators = child.execute();
      return sorter.sort(iterators);
    }
  
    @Override
    public void close() {
      if (!closed) {
        super.close();
        if (sorter != null) {
          sorter.close();
        }
      }
    }
  
    @Override
    protected String getStepName() {
      return "Sort Processor";
    }
  }
  