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

java.lang.Object
  org.apache.hadoop.hbase.io.encoding.HFileBlockDefaultDecodingContext

All Implemented Interfaces:

HFileBlockDecodingContext

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

Constructor Summary

HFileBlockDefaultDecodingContext(Compression.Algorithm compressAlgo)

Method Summary

Compression.Algorithm	getCompression()
void	prepareDecoding(int onDiskSizeWithoutHeader, int uncompressedSizeWithoutHeader, ByteBuffer blockBufferWithoutHeader, byte[] onDiskBlock, int offset) Perform all actions that need to be done before the encoder's real decoding process.

Methods inherited from class java.lang.Object

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

Constructor Detail

HFileBlockDefaultDecodingContext

public HFileBlockDefaultDecodingContext(Compression.Algorithm compressAlgo)

Method Detail

prepareDecoding

public void prepareDecoding(int onDiskSizeWithoutHeader,
                            int uncompressedSizeWithoutHeader,
                            ByteBuffer blockBufferWithoutHeader,
                            byte[] onDiskBlock,
                            int offset)
                     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 HFileBlockDecodingContext.getCompression() returns a valid compression algorithm.

Specified by:

prepareDecoding in interface HFileBlockDecodingContext

Parameters:

onDiskSizeWithoutHeader - numBytes after block and encoding headers

uncompressedSizeWithoutHeader - numBytes without header required to store the block after decompressing (not decoding)

blockBufferWithoutHeader - ByteBuffer pointed after the header but before the data

onDiskBlock - on disk bytes to be decoded

offset - data start offset in onDiskBlock

Throws:

IOException

getCompression

public Compression.Algorithm getCompression()

Specified by:

getCompression in interface HFileBlockDecodingContext

Returns:

the compression algorithm used by this decoding context