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 java.io.IOException;
  
  import org.apache.carbondata.core.datastore.FileReader;
  import org.apache.carbondata.core.datastore.ReusableDataBuffer;
  import org.apache.carbondata.core.datastore.chunk.impl.MeasureRawColumnChunk;
  import org.apache.carbondata.core.datastore.page.ColumnPage;
  import org.apache.carbondata.core.scan.result.vector.ColumnVectorInfo;
  
  /**
   * Reader interface for reading the measure blocks from file
   */
  public interface MeasureColumnChunkReader {
  
    /**
     * Method to read the blocks data based on block indexes
     *
     * @param fileReader   file reader to read the blocks
     * @param columnIndexRange blocks to be read
     * @return measure data chunks
     */
    MeasureRawColumnChunk[] readRawMeasureChunks(FileReader fileReader, int[][] columnIndexRange)
        throws IOException;
  
    /**
     * Method to read the blocks data based on block index
     *
     * @param fileReader file reader to read the blocks
     * @param columnIndex block to be read
     * @return measure data chunk
     */
    MeasureRawColumnChunk readRawMeasureChunk(FileReader fileReader, int columnIndex)
        throws IOException;
  
    /**
     * Convert raw data to measure chunk
     * @param measureRawColumnChunk
     * @param pageNumber
     * @return
     * @throws IOException
     */
    ColumnPage decodeColumnPage(MeasureRawColumnChunk measureRawColumnChunk, int pageNumber,
        ReusableDataBuffer reusableDataBuffer) throws IOException;
  
    /**
     * Decode raw data and fill the vector
     */
    void decodeColumnPageAndFillVector(MeasureRawColumnChunk measureRawColumnChunk, int pageNumber,
        ColumnVectorInfo vectorInfo, ReusableDataBuffer reusableDataBuffer)
        throws IOException;
  
  }
  