org.apache.parquet.column.values.fallback

Class FallbackValuesWriter<I extends ValuesWriter & RequiresFallback,F extends ValuesWriter>

java.lang.Object

org.apache.parquet.column.values.ValuesWriter

org.apache.parquet.column.values.fallback.FallbackValuesWriter<I,F>

All Implemented Interfaces:

AutoCloseable

public class FallbackValuesWriter<I extends ValuesWriter & RequiresFallback,F extends ValuesWriter>
extends ValuesWriter

Field Summary

Fields

Modifier and Type	Field and Description
F	fallBackWriter fallback
I	initialWriter writer to start with

Constructor Summary

Constructors

Constructor and Description
FallbackValuesWriter(I initialWriter, F fallBackWriter)

Method Summary

Modifier and Type	Method and Description
void	close() Called to close the values writer.
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)
static <I extends ValuesWriter & RequiresFallback,F extends ValuesWriter> FallbackValuesWriter<I,F>	of(I initialWriter, F fallBackWriter)
void	reset() called after getBytes() to reset the current buffer and start writing the next page
void	resetDictionary() reset the dictionary when a new block starts
DictionaryPage	toDictPageAndClose() Returns the dictionary generated by this writer if one was created.
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

writeBoolean

Methods inherited from class java.lang.Object

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

Field Detail

initialWriter

public final I extends ValuesWriter & RequiresFallback initialWriter

writer to start with

fallBackWriter

public final F extends ValuesWriter fallBackWriter

fallback

Constructor Detail

FallbackValuesWriter

public FallbackValuesWriter(I initialWriter,
                            F fallBackWriter)

Method Detail

of

public static <I extends ValuesWriter & RequiresFallback,F extends ValuesWriter> FallbackValuesWriter<I,F> of(I initialWriter,
                                                                                                              F fallBackWriter)

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)

getBytes

public BytesInput getBytes()

Specified by:

getBytes in class ValuesWriter

Returns:

the bytes buffered so far to write to the current page

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

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

close

public void close()

Description copied from class: ValuesWriter

Called to close the values writer. Any output stream is closed and can no longer be used. All resources are released.

Specified by:

close in interface AutoCloseable

Overrides:

close in class ValuesWriter

toDictPageAndClose

public DictionaryPage toDictPageAndClose()

Description copied from class: ValuesWriter

Returns the dictionary generated by this writer if one was created. As part of this operation the dictionary is closed and will not have any new values written into it.

Overrides:

toDictPageAndClose in class ValuesWriter

Returns:

the dictionary page or null if not dictionary based

resetDictionary

public void resetDictionary()

Description copied from class: ValuesWriter

reset the dictionary when a new block starts

Overrides:

resetDictionary in class ValuesWriter

getAllocatedSize

public long getAllocatedSize()

Description copied from class: ValuesWriter

( > ValuesWriter.getBufferedSize() )

Specified by:

getAllocatedSize in class ValuesWriter

Returns:

the allocated size of the buffer

memUsageString

public String memUsageString(String prefix)

Specified by:

memUsageString in class ValuesWriter

writeByte

public void writeByte(int value)

Overrides:

writeByte in class ValuesWriter

Parameters:

value - the value to encode

writeBytes

public void writeBytes(Binary v)

Overrides:

writeBytes in class ValuesWriter

Parameters:

v - the value to encode

writeInteger

public void writeInteger(int v)

Overrides:

writeInteger 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

writeFloat

public void writeFloat(float v)

Overrides:

writeFloat 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