Package org.apache.parquet.column.values.deltastrings

Class DeltaByteArrayWriter

java.lang.Object

org.apache.parquet.column.values.ValuesWriter

org.apache.parquet.column.values.deltastrings.DeltaByteArrayWriter

public class DeltaByteArrayWriter
extends ValuesWriter

Write prefix lengths using delta encoding, followed by suffixes with Delta length byte arrays

   
   delta-length-byte-array : prefix-length* suffixes*
   
 

Constructor Summary

Constructors

Constructor	Description
DeltaByteArrayWriter(int initialCapacity, int pageSize, ByteBufferAllocator allocator)

Method Summary

Modifier and Type	Method	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)
void	reset()	called after getBytes() to reset the current buffer and start writing the next page
void	writeBytes(Binary v)

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

resetDictionary, toDictPageAndClose, writeBoolean, writeByte, writeDouble, writeFloat, writeInteger, writeLong

Methods inherited from class java.lang.Object

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

Constructor Detail

DeltaByteArrayWriter

public DeltaByteArrayWriter(int initialCapacity,
                            int pageSize,
                            ByteBufferAllocator allocator)

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)

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.

Overrides:

close 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

writeBytes

public void writeBytes(Binary v)

Overrides:

writeBytes in class ValuesWriter

Parameters:

v - the value to encode