Package 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	Description
ZeroIntegerValuesReader()

Method Summary

Modifier and Type	Method	Description
void	initFromPage(int valueCount, org.apache.parquet.bytes.ByteBufferInputStream stream)	Called to initialize the column reader from a part of a page.
int	readInteger()
void	skip()	Skips the next value in the page
void	skip(int n)	Skips the next n values in the page

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

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

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,
                         org.apache.parquet.bytes.ByteBufferInputStream stream)
                  throws IOException

Description copied from class: ValuesReader

Called to initialize the column reader from a part of a page. Implementations must consume all bytes from the input stream, leaving the stream ready to read the next section of data. 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

Overrides:

initFromPage in class ValuesReader

Parameters:

valueCount - count of values in this page

stream - an input stream containing the page data at the correct offset

Throws:

IOException - if there is an exception while reading from the input stream

skip

public void skip()

Description copied from class: ValuesReader

Skips the next value in the page

Specified by:

skip in class ValuesReader

skip

public void skip(int n)

Description copied from class: ValuesReader

Skips the next n values in the page

Overrides:

skip in class ValuesReader

Parameters:

n - the number of values to be skipped