org.apache.hadoop.hbase.io.encoding

Interface HFileBlockDecodingContext

All Known Implementing Classes:

HFileBlockDefaultDecodingContext

@InterfaceAudience.Private
public interface HFileBlockDecodingContext

A decoding context that is created by a reader's encoder, and is shared across the reader's all read operations.

See Also:

for encoding

Method Summary

Modifier and Type	Method and Description
HFileContext	getHFileContext()
void	prepareDecoding(int onDiskSizeWithoutHeader, int uncompressedSizeWithoutHeader, ByteBuffer blockBufferWithoutHeader, ByteBuffer onDiskBlock) Perform all actions that need to be done before the encoder's real decoding process.

Method Detail

prepareDecoding

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

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.

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 data to be decoded

Throws:

IOException

getHFileContext

HFileContext getHFileContext()

Returns:

HFile meta information