org.apache.hadoop.hbase.io.encoding

Class HFileBlockDefaultDecodingContext

java.lang.Object

org.apache.hadoop.hbase.io.encoding.HFileBlockDefaultDecodingContext

All Implemented Interfaces:

HFileBlockDecodingContext

@InterfaceAudience.Private
public class HFileBlockDefaultDecodingContext
extends Object
implements HFileBlockDecodingContext

A default implementation of HFileBlockDecodingContext. It assumes the block data section is compressed as a whole.

See Also:

for the default compression context

Field Summary

Fields

Modifier and Type	Field and Description
private org.apache.hadoop.conf.Configuration	conf
private HFileContext	fileContext
private TagCompressionContext	tagCompressionContext

Constructor Summary

Constructors

Constructor and Description
HFileBlockDefaultDecodingContext(org.apache.hadoop.conf.Configuration conf, HFileContext fileContext)

Method Summary

Modifier and Type	Method and Description
HFileContext	getHFileContext() Returns HFile meta information
TagCompressionContext	getTagCompressionContext()
void	prepareDecoding(int onDiskSizeWithoutHeader, int uncompressedSizeWithoutHeader, ByteBuff blockBufferWithoutHeader, ByteBuff onDiskBlock) Perform all actions that need to be done before the encoder's real decoding process.
void	setTagCompressionContext(TagCompressionContext tagCompressionContext)

Methods inherited from class java.lang.Object

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

Field Detail

conf

private final org.apache.hadoop.conf.Configuration conf

fileContext

private final HFileContext fileContext

tagCompressionContext

private TagCompressionContext tagCompressionContext

Constructor Detail

HFileBlockDefaultDecodingContext

public HFileBlockDefaultDecodingContext(org.apache.hadoop.conf.Configuration conf,
                                        HFileContext fileContext)

Method Detail

prepareDecoding

public void prepareDecoding(int onDiskSizeWithoutHeader,
                            int uncompressedSizeWithoutHeader,
                            ByteBuff blockBufferWithoutHeader,
                            ByteBuff onDiskBlock)
                     throws IOException

Description copied from interface: HFileBlockDecodingContext

Perform all actions that need to be done before the encoder's real decoding process. Decompression needs to be done if HFileContext.getCompression() returns a valid compression algorithm. n * numBytes after block and encoding headers n * numBytes without header required to store the block after decompressing (not decoding) n * ByteBuffer pointed after the header but before the data n * on disk data to be decoded

Specified by:

prepareDecoding in interface HFileBlockDecodingContext

Throws:

IOException

getHFileContext

public HFileContext getHFileContext()

Description copied from interface: HFileBlockDecodingContext

Returns HFile meta information

Specified by:

getHFileContext in interface HFileBlockDecodingContext

getTagCompressionContext

public TagCompressionContext getTagCompressionContext()

setTagCompressionContext

public void setTagCompressionContext(TagCompressionContext tagCompressionContext)