PlainValuesReader.java

package org.apache.hadoop.hive.mastiffFlexibleEncoding.parquet;

/*
 * adapted  from Parquet*
 */

//
//import static parquet.Log.DEBUG;

import java.io.ByteArrayInputStream;
import java.io.IOException;

//import parquet.Log;
//import parquet.bytes.LittleEndianDataInputStream;
//import parquet.column.values.ValuesReader;
//import parquet.io.ParquetDecodingException;

/**
 * Plain encoding for float, double, int, long
 *
 * @author Julien Le Dem
 *
 */
abstract public class PlainValuesReader extends ValuesReader {
  private static final Log LOG = Log.getLog(PlainValuesReader.class);

  protected  LittleEndianDataInputStream in;

  /**
   * {@inheritDoc}
   * @see parquet.column.values.ValuesReader#initFromPage(byte[], int)
   */
  @Override
  public void initFromPage(int valueCount, byte[] in, int offset) throws IOException {
    if (Log.DEBUG) LOG.debug("init from page at offset "+ offset + " for length " + (in.length - offset));
    this.in = new LittleEndianDataInputStream(new ByteArrayInputStream(in, offset, in.length - offset));
  }

  public static class DoublePlainValuesReader extends PlainValuesReader {

    @Override
    public void skip() {
      try {
        in.skipBytes(8);
      } catch (IOException e) {
        throw new ParquetDecodingException("could not skip double", e);
      }
    }

    @Override
    public double readDouble() {
      try {
        return in.readDouble();
      } catch (IOException e) {
        throw new ParquetDecodingException("could not read double", e);
      }
    }
  }

  public static class FloatPlainValuesReader extends PlainValuesReader {

    @Override
    public void skip() {
      try {
        in.skipBytes(4);
      } catch (IOException e) {
        throw new ParquetDecodingException("could not skip float", e);
      }
    }

    @Override
    public float readFloat() {
      try {
        return in.readFloat();
      } catch (IOException e) {
        throw new ParquetDecodingException("could not read float", e);
      }
    }
  }

  public static class IntegerPlainValuesReader extends PlainValuesReader {

    @Override
    public void skip() {
      try {
        in.skipBytes(4);
      } catch (IOException e) {
        throw new ParquetDecodingException("could not skip int", e);
      }
    }

    @Override
    public int readInteger() {
      try {
        return in.readInt();
      } catch (IOException e) {
        throw new ParquetDecodingException("could not read int", e);
      }
    }
  }

  public static class LongPlainValuesReader extends PlainValuesReader {

    @Override
    public void skip() {
      try {
        in.skipBytes(8);
      } catch (IOException e) {
        throw new ParquetDecodingException("could not skip long", e);
      }
    }

    @Override
    public long readLong() {
      try {
        return in.readLong();
      } catch (IOException e) {
        throw new ParquetDecodingException("could not read long", e);
      }
    }
  }
}