org.apache.hadoop.hbase.io.encoding
Interface HFileBlockDecodingContext
- All Known Implementing Classes:
- HFileBlockDefaultDecodingContext
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
getCompression
Compression.Algorithm getCompression()
- Returns:
- the compression algorithm used by this decoding context
prepareDecoding
void prepareDecoding(int onDiskSizeWithoutHeader,
int uncompressedSizeWithoutHeader,
ByteBuffer blockBufferWithoutHeader,
byte[] onDiskBlock,
int offset)
throws IOException
- Perform all actions that need to be done before the encoder's real decoding process.
Decompression needs to be done if
getCompression() returns a valid compression
algorithm.
- Parameters:
onDiskSizeWithoutHeader - numBytes after block and encoding headersuncompressedSizeWithoutHeader - numBytes without header required to store the block after
decompressing (not decoding)blockBufferWithoutHeader - ByteBuffer pointed after the header but before the dataonDiskBlock - on disk bytes to be decodedoffset - data start offset in onDiskBlock
- Throws:
IOException
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