org.apache.parquet.column.values.rle

Class ZeroIntegerValuesReader

java.lang.Object

org.apache.parquet.column.values.ValuesReader

org.apache.parquet.column.values.rle.ZeroIntegerValuesReader

public class ZeroIntegerValuesReader
extends ValuesReader

ColumnReader which does not read any actual data, but rather simply produces an endless stream of constant values. Mainly used to read definition levels when the only possible value is 0

Constructor Summary

Constructors

Constructor and Description
ZeroIntegerValuesReader()

Method Summary

Methods

Modifier and Type	Method and Description
int	getNextOffset() Called to return offset of the next section
void	initFromPage(int valueCount, ByteBuffer in, int offset) Called to initialize the column reader from a part of a page.
int	readInteger()
void	skip() Skips the next value in the page

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

initFromPage, readBoolean, readBytes, readDouble, readFloat, readLong, readValueDictionaryId

Methods inherited from class java.lang.Object

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

Constructor Detail

ZeroIntegerValuesReader

public ZeroIntegerValuesReader()

Method Detail

readInteger

public int readInteger()

Overrides:

readInteger in class ValuesReader

Returns:

the next integer from the page

initFromPage

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

Description copied from class: ValuesReader

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

getNextOffset

public int getNextOffset()

Description copied from class: ValuesReader

Called to return offset of the next section

Overrides:

getNextOffset in class ValuesReader

Returns:

offset of the next section

skip

public void skip()

Description copied from class: ValuesReader

Skips the next value in the page

Specified by:

skip in class ValuesReader