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.datastore.chunk.reader;
  
  import org.apache.carbondata.core.datastore.chunk.reader.dimension.v3.DimensionChunkPageReaderV3;
  import org.apache.carbondata.core.datastore.chunk.reader.dimension.v3.DimensionChunkReaderV3;
  import org.apache.carbondata.core.datastore.chunk.reader.measure.v3.MeasureChunkPageReaderV3;
  import org.apache.carbondata.core.datastore.chunk.reader.measure.v3.MeasureChunkReaderV3;
  import org.apache.carbondata.core.metadata.ColumnarFormatVersion;
  import org.apache.carbondata.core.metadata.blocklet.BlockletInfo;
  
  /**
   * Factory class to get the data reader instance based on version
   */
  public class CarbonDataReaderFactory {
  
    /**
     * static instance
     */
    private static final CarbonDataReaderFactory CARBON_DATA_READER_FACTORY =
        new CarbonDataReaderFactory();
  
    /**
     * private constructor
     */
    private CarbonDataReaderFactory() {
  
    }
  
    /**
     * To get the instance of the reader factor
     *
     * @return reader factory
     */
    public static CarbonDataReaderFactory getInstance() {
      return CARBON_DATA_READER_FACTORY;
    }
  
    /**
     * Below method will be used to get the dimension column chunk reader based on version number
     *
     * @param version             reader version
     * @param blockletInfo        blocklet info
     * @param filePath            carbon data file path
     * @return dimension column data reader based on version number
     */
    public DimensionColumnChunkReader getDimensionColumnChunkReader(ColumnarFormatVersion version,
        BlockletInfo blockletInfo, String filePath, boolean readPageByPage) {
      switch (version) {
        case V3:
          if (readPageByPage) {
            return new DimensionChunkPageReaderV3(blockletInfo, filePath);
          } else {
            return new DimensionChunkReaderV3(blockletInfo, filePath);
          }
        default:
          throw new UnsupportedOperationException("Unsupported columnar format version: " + version);
      }
    }
  
    /**
     * Below method will be used to get the measure column chunk reader based version number
     *
     * @param version      reader version
     * @param blockletInfo blocklet info
     * @param filePath     carbon data file path
     * @return measure column data reader based on version number
     */
    public MeasureColumnChunkReader getMeasureColumnChunkReader(ColumnarFormatVersion version,
        BlockletInfo blockletInfo, String filePath, boolean readPageByPage) {
      switch (version) {
        case V3:
          if (readPageByPage) {
            return new MeasureChunkPageReaderV3(blockletInfo, filePath);
          } else {
            return new MeasureChunkReaderV3(blockletInfo, filePath);
          }
        default:
          throw new UnsupportedOperationException("Unsupported columnar format version: " + version);
      }
    }
  }
  