Package org.apache.hadoop.io.compress

Class BlockDecompressorStream

java.lang.Object

java.io.InputStream

org.apache.hadoop.io.compress.CompressionInputStream

org.apache.hadoop.io.compress.DecompressorStream

org.apache.hadoop.io.compress.BlockDecompressorStream

All Implemented Interfaces:

Closeable, AutoCloseable, Seekable, org.apache.hadoop.fs.statistics.IOStatisticsSource

@Public
@Evolving
public class BlockDecompressorStream
extends DecompressorStream

A DecompressorStream which works with 'block-based' based compression algorithms, as opposed to 'stream-based' compression algorithms.

Field Summary

Fields inherited from class org.apache.hadoop.io.compress.DecompressorStream

buffer, closed, decompressor, eof

Fields inherited from class org.apache.hadoop.io.compress.CompressionInputStream

in, maxAvailableData

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	BlockDecompressorStream(InputStream in)
	BlockDecompressorStream(InputStream in, Decompressor decompressor)	Create a BlockDecompressorStream.
	BlockDecompressorStream(InputStream in, Decompressor decompressor, int bufferSize)	Create a BlockDecompressorStream.

Method Summary

Modifier and Type	Method	Description
protected int	decompress(byte[] b, int off, int len)
protected int	getCompressedData()
void	resetState()	Reset the decompressor to its initial state and discard any buffered data, as the underlying stream may have been repositioned.

Methods inherited from class org.apache.hadoop.io.compress.DecompressorStream

available, checkStream, close, mark, markSupported, read, read, reset, skip

Methods inherited from class org.apache.hadoop.io.compress.CompressionInputStream

getIOStatistics, getPos, seek, seekToNewSource

Methods inherited from class java.io.InputStream

nullInputStream, read, readAllBytes, readNBytes, readNBytes, skipNBytes, transferTo

Methods inherited from class java.lang.Object

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

Constructor Details

BlockDecompressorStream

public BlockDecompressorStream(InputStream in,
 Decompressor decompressor,
 int bufferSize)
                        throws IOException

Create a BlockDecompressorStream.

Parameters:

in - input stream

decompressor - decompressor to use

bufferSize - size of buffer

Throws:

IOException - raised on errors performing I/O.

BlockDecompressorStream

public BlockDecompressorStream(InputStream in,
 Decompressor decompressor)
                        throws IOException

Create a BlockDecompressorStream.

Parameters:

in - input stream

decompressor - decompressor to use

Throws:

IOException - raised on errors performing I/O.

BlockDecompressorStream

protected BlockDecompressorStream(InputStream in)
                           throws IOException

Throws:

IOException

Method Details

decompress

protected int decompress(byte[] b,
 int off,
 int len)
                  throws IOException

Overrides:

decompress in class DecompressorStream

Throws:

IOException

getCompressedData

protected int getCompressedData()
                         throws IOException

Overrides:

getCompressedData in class DecompressorStream

Throws:

IOException

resetState

public void resetState()
                throws IOException

Description copied from class: CompressionInputStream

Reset the decompressor to its initial state and discard any buffered data, as the underlying stream may have been repositioned.

Overrides:

resetState in class DecompressorStream

Throws:

IOException - raised on errors performing I/O.