org.apache.hadoop.hbase.io.encoding

Class CompressionState

java.lang.Object

org.apache.hadoop.hbase.io.encoding.CompressionState

Direct Known Subclasses:

DiffKeyDeltaEncoder.DiffCompressionState, FastDiffDeltaEncoder.FastDiffCompressionState

@InterfaceAudience.Private
class CompressionState
extends Object

Stores the state of data block encoder at the beginning of new key.

Field Summary

Fields

Modifier and Type	Field and Description
(package private) byte	familyLength
private static int	FIRST_KEY
(package private) int	keyLength
(package private) int	prevOffset
(package private) int	qualifierLength
(package private) short	rowLength
(package private) byte	type
(package private) int	valueLength

Constructor Summary

Constructors

Constructor and Description
CompressionState()

Method Summary

Modifier and Type	Method and Description
(package private) void	copyFrom(CompressionState state)
(package private) boolean	isFirst()
(package private) void	readKey(ByteBuffer in, int keyLength, int valueLength) Analyze the key and fill the state.
(package private) void	readKey(ByteBuffer in, int keyLength, int valueLength, int commonPrefix, CompressionState previousState) Analyze the key and fill the state assuming we know previous state.
protected void	readTimestamp(ByteBuffer in)

Methods inherited from class java.lang.Object

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

Field Detail

keyLength

int keyLength

valueLength

int valueLength

rowLength

short rowLength

prevOffset

int prevOffset

familyLength

byte familyLength

qualifierLength

int qualifierLength

type

byte type

FIRST_KEY

private static final int FIRST_KEY

See Also:

Constant Field Values

Constructor Detail

CompressionState

CompressionState()

Method Detail

isFirst

boolean isFirst()

readKey

void readKey(ByteBuffer in,
             int keyLength,
             int valueLength)

Analyze the key and fill the state. Uses mark() and reset() in ByteBuffer.

Parameters:

in - Buffer at the position where key starts

keyLength - Length of key in bytes

valueLength - Length of values in bytes

readKey

void readKey(ByteBuffer in,
             int keyLength,
             int valueLength,
             int commonPrefix,
             CompressionState previousState)

Analyze the key and fill the state assuming we know previous state. Uses mark() and reset() in ByteBuffer to avoid moving the position.

This method overrides all the fields of this instance, except prevOffset, which is usually manipulated directly by encoders and decoders.

Parameters:

in - Buffer at the position where key starts

keyLength - Length of key in bytes

valueLength - Length of values in bytes

commonPrefix - how many first bytes are common with previous KeyValue

previousState - State from previous KeyValue

readTimestamp

protected void readTimestamp(ByteBuffer in)

copyFrom

void copyFrom(CompressionState state)