org.apache.parquet.column.values.bitpacking

Class DevNullValuesWriter

java.lang.Object

org.apache.parquet.column.values.ValuesWriter

org.apache.parquet.column.values.bitpacking.DevNullValuesWriter

All Implemented Interfaces:

AutoCloseable

public class DevNullValuesWriter
extends ValuesWriter

This is a special writer that doesn't write anything. The idea being that some columns will always be the same value, and this will capture that. An example is the set of repetition levels for a schema with no repeated fields.

Constructor Summary

Constructors

Constructor and Description
DevNullValuesWriter()

Method Summary

Modifier and Type	Method and Description
long	getAllocatedSize() ( > ValuesWriter.getBufferedSize() )
long	getBufferedSize() used to decide if we want to work to the next page
BytesInput	getBytes()
Encoding	getEncoding() called after getBytes() and before reset()
String	memUsageString(String prefix)
void	reset() called after getBytes() to reset the current buffer and start writing the next page
void	writeBoolean(boolean v)
void	writeByte(int value)
void	writeBytes(Binary v)
void	writeDouble(double v)
void	writeFloat(float v)
void	writeInteger(int v)
void	writeLong(long v)

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

close, resetDictionary, toDictPageAndClose

Methods inherited from class java.lang.Object

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

Constructor Detail

DevNullValuesWriter

public DevNullValuesWriter()

Method Detail

getBufferedSize

public long getBufferedSize()

Description copied from class: ValuesWriter

used to decide if we want to work to the next page

Specified by:

getBufferedSize in class ValuesWriter

Returns:

the size of the currently buffered data (in bytes)

reset

public void reset()

Description copied from class: ValuesWriter

called after getBytes() to reset the current buffer and start writing the next page

Specified by:

reset in class ValuesWriter

writeInteger

public void writeInteger(int v)

Overrides:

writeInteger in class ValuesWriter

Parameters:

v - the value to encode

writeByte

public void writeByte(int value)

Overrides:

writeByte in class ValuesWriter

Parameters:

value - the value to encode

writeBoolean

public void writeBoolean(boolean v)

Overrides:

writeBoolean in class ValuesWriter

Parameters:

v - the value to encode

writeBytes

public void writeBytes(Binary v)

Overrides:

writeBytes in class ValuesWriter

Parameters:

v - the value to encode

writeLong

public void writeLong(long v)

Overrides:

writeLong in class ValuesWriter

Parameters:

v - the value to encode

writeDouble

public void writeDouble(double v)

Overrides:

writeDouble in class ValuesWriter

Parameters:

v - the value to encode

writeFloat

public void writeFloat(float v)

Overrides:

writeFloat in class ValuesWriter

Parameters:

v - the value to encode

getBytes

public BytesInput getBytes()

Specified by:

getBytes in class ValuesWriter

Returns:

the bytes buffered so far to write to the current page

getAllocatedSize

public long getAllocatedSize()

Description copied from class: ValuesWriter

( > ValuesWriter.getBufferedSize() )

Specified by:

getAllocatedSize in class ValuesWriter

Returns:

the allocated size of the buffer

getEncoding

public Encoding getEncoding()

Description copied from class: ValuesWriter

called after getBytes() and before reset()

Specified by:

getEncoding in class ValuesWriter

Returns:

the encoding that was used to encode the bytes

memUsageString

public String memUsageString(String prefix)

Specified by:

memUsageString in class ValuesWriter