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.core.util;
  
  import java.io.IOException;
  import java.util.ArrayList;
  import java.util.List;
  
  import org.apache.carbondata.core.datastore.FileReader;
  import org.apache.carbondata.core.datastore.block.TableBlockInfo;
  import org.apache.carbondata.core.datastore.impl.FileFactory;
  import org.apache.carbondata.core.metadata.ColumnarFormatVersion;
  import org.apache.carbondata.core.metadata.blocklet.BlockletInfo;
  import org.apache.carbondata.core.metadata.blocklet.DataFileFooter;
  import org.apache.carbondata.core.metadata.blocklet.index.BlockletIndex;
  import org.apache.carbondata.core.metadata.schema.table.column.ColumnSchema;
  import org.apache.carbondata.core.reader.CarbonFooterReader;
  import org.apache.carbondata.format.FileFooter;
  
  import org.apache.hadoop.conf.Configuration;
  
  /**
   * Below class will be used to convert the thrift object of data file
   * meta data to wrapper object
   */
  public class DataFileFooterConverter extends AbstractDataFileFooterConverter {
  
    public DataFileFooterConverter(Configuration configuration) {
      super(configuration);
    }
  
    public DataFileFooterConverter() {
      super(FileFactory.getConfiguration());
    }
  
    /**
     * Below method will be used to convert thrift file meta to wrapper file meta
     */
    @Override
    public DataFileFooter readDataFileFooter(TableBlockInfo tableBlockInfo)
        throws IOException {
      DataFileFooter dataFileFooter = new DataFileFooter();
      FileReader fileReader = null;
      try {
        long completeBlockLength = tableBlockInfo.getBlockLength();
        long footerPointer = completeBlockLength - 8;
        fileReader = FileFactory.getFileHolder(FileFactory.getFileType(tableBlockInfo.getFilePath()));
        long actualFooterOffset = fileReader.readLong(tableBlockInfo.getFilePath(), footerPointer);
        CarbonFooterReader reader =
            new CarbonFooterReader(tableBlockInfo.getFilePath(), actualFooterOffset);
        FileFooter footer = reader.readFooter();
        dataFileFooter.setVersionId(ColumnarFormatVersion.valueOf((short) footer.getVersion()));
        dataFileFooter.setNumberOfRows(footer.getNum_rows());
        dataFileFooter.setColumnInTable(convertColumnSchemaList(footer.getTable_columns()));
  
        List<org.apache.carbondata.format.BlockletIndex> leaf_node_indices_Thrift =
            footer.getBlocklet_index_list();
        List<BlockletIndex> blockletIndexList = new ArrayList<BlockletIndex>();
        for (int i = 0; i < leaf_node_indices_Thrift.size(); i++) {
          BlockletIndex blockletIndex = getBlockletIndex(leaf_node_indices_Thrift.get(i));
          blockletIndexList.add(blockletIndex);
        }
  
        List<org.apache.carbondata.format.BlockletInfo> leaf_node_infos_Thrift =
            footer.getBlocklet_info_list();
        List<BlockletInfo> blockletInfoList = new ArrayList<BlockletInfo>();
        for (int i = 0; i < leaf_node_infos_Thrift.size(); i++) {
          BlockletInfo blockletInfo = getBlockletInfo(leaf_node_infos_Thrift.get(i));
          blockletInfo.setBlockletIndex(blockletIndexList.get(i));
          blockletInfoList.add(blockletInfo);
        }
        dataFileFooter.setBlockletList(blockletInfoList);
        dataFileFooter.setBlockletIndex(getBlockletIndexForDataFileFooter(blockletIndexList,
            dataFileFooter.getColumnInTable()));
      } finally {
        if (null != fileReader) {
          fileReader.finish();
        }
      }
      return dataFileFooter;
    }
  
    /**
     * Below method is to convert the blocklet info of the thrift to wrapper
     * blocklet info
     *
     * @param blockletInfoThrift blocklet info of the thrift
     * @return blocklet info wrapper
     */
    private BlockletInfo getBlockletInfo(
        org.apache.carbondata.format.BlockletInfo blockletInfoThrift) {
      BlockletInfo blockletInfo = new BlockletInfo();
      blockletInfo.setNumberOfRows(blockletInfoThrift.getNum_rows());
      return blockletInfo;
    }
  
    @Override
    public List<ColumnSchema> getSchema(TableBlockInfo tableBlockInfo) throws IOException {
      FileReader fileReader = null;
      try {
        long completeBlockLength = tableBlockInfo.getBlockLength();
        long footerPointer = completeBlockLength - 8;
        fileReader = FileFactory.getFileHolder(FileFactory.getFileType(tableBlockInfo.getFilePath()));
        long actualFooterOffset = fileReader.readLong(tableBlockInfo.getFilePath(), footerPointer);
        CarbonFooterReader reader =
            new CarbonFooterReader(tableBlockInfo.getFilePath(), actualFooterOffset);
        return convertColumnSchemaList(reader.readFooter().getTable_columns());
      } finally {
        if (null != fileReader) {
          fileReader.finish();
        }
      }
    }
  }
  