org.apache.parquet.column.values.plain

Class PlainValuesReader

java.lang.Object

org.apache.parquet.column.values.ValuesReader

org.apache.parquet.column.values.plain.PlainValuesReader

Direct Known Subclasses:

PlainValuesReader.DoublePlainValuesReader, PlainValuesReader.FloatPlainValuesReader, PlainValuesReader.IntegerPlainValuesReader, PlainValuesReader.LongPlainValuesReader

public abstract class PlainValuesReader
extends ValuesReader

Plain encoding for float, double, int, long

Author:

Julien Le Dem

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	PlainValuesReader.DoublePlainValuesReader
static class	PlainValuesReader.FloatPlainValuesReader
static class	PlainValuesReader.IntegerPlainValuesReader
static class	PlainValuesReader.LongPlainValuesReader

Field Summary

Fields

Modifier and Type	Field and Description
protected LittleEndianDataInputStream	in

Constructor Summary

Constructors

Constructor and Description
PlainValuesReader()

Method Summary

Methods

Modifier and Type	Method and Description
void	initFromPage(int valueCount, ByteBuffer in, int offset) Called to initialize the column reader from a part of a page.

Methods inherited from class org.apache.parquet.column.values.ValuesReader

getNextOffset, initFromPage, readBoolean, readBytes, readDouble, readFloat, readInteger, readLong, readValueDictionaryId, skip

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

in

protected LittleEndianDataInputStream in

Constructor Detail

PlainValuesReader

public PlainValuesReader()

Method Detail

initFromPage

public void initFromPage(int valueCount,
                ByteBuffer in,
                int offset)
                  throws IOException

Called to initialize the column reader from a part of a page. The underlying implementation knows how much data to read, so a length is not provided. Each page may contain several sections:

• repetition levels column
• definition levels column
• data column

This function is called with 'offset' pointing to the beginning of one of these sections, and should return the offset to the section following it.

Specified by:

initFromPage in class ValuesReader

Parameters:

valueCount - count of values in this page

in - the array to read from containing the page data (repetition levels, definition levels, data)

offset - where to start reading from in the page

Throws:

IOException

See Also:

ValuesReader.initFromPage(int, ByteBuffer, int)