org.apache.hadoop.io.compress
Class LzoCodec

java.lang.Object
  org.apache.hadoop.io.compress.LzoCodec

All Implemented Interfaces:

Configurable, CompressionCodec

public class LzoCodec
extends Object
implements Configurable, CompressionCodec

A CompressionCodec for a streaming lzo compression/decompression pair. http://www.oberhumer.com/opensource/lzo/

Constructor Summary

LzoCodec()

Method Summary

Compressor	createCompressor() Create a new Compressor for use by this CompressionCodec.
Decompressor	createDecompressor() Create a new Decompressor for use by this CompressionCodec.
CompressionInputStream	createInputStream(InputStream in) Create a stream decompressor that will read from the given input stream.
CompressionInputStream	createInputStream(InputStream in, Decompressor decompressor) Create a CompressionInputStream that will read from the given InputStream with the given Decompressor.
CompressionOutputStream	createOutputStream(OutputStream out) Create a CompressionOutputStream that will write to the given OutputStream.
CompressionOutputStream	createOutputStream(OutputStream out, Compressor compressor) Create a CompressionOutputStream that will write to the given OutputStream with the given Compressor.
Class<? extends Compressor>	getCompressorType() Get the type of Compressor needed by this CompressionCodec.
Configuration	getConf() Return the configuration used by this object.
Class<? extends Decompressor>	getDecompressorType() Get the type of Decompressor needed by this CompressionCodec.
String	getDefaultExtension() Get the default filename extension for this kind of compression.
static boolean	isNativeLzoLoaded(Configuration conf) Check if native-lzo library is loaded & initialized.
void	setConf(Configuration conf) Set the configuration to be used by this object.

Methods inherited from class java.lang.Object

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

Constructor Detail

LzoCodec

public LzoCodec()

Method Detail

setConf

public void setConf(Configuration conf)

Description copied from interface: Configurable

Set the configuration to be used by this object.

Specified by:

setConf in interface Configurable

getConf

public Configuration getConf()

Description copied from interface: Configurable

Return the configuration used by this object.

Specified by:

getConf in interface Configurable

isNativeLzoLoaded

public static boolean isNativeLzoLoaded(Configuration conf)

Check if native-lzo library is loaded & initialized.

Parameters:

conf - configuration

Returns:

true if native-lzo library is loaded & initialized; else false

createOutputStream

public CompressionOutputStream createOutputStream(OutputStream out)
                                           throws IOException

Description copied from interface: CompressionCodec

Create a CompressionOutputStream that will write to the given OutputStream.

Specified by:

createOutputStream in interface CompressionCodec

Parameters:

out - the location for the final output stream

Returns:

a stream the user can write uncompressed data to have it compressed

Throws:

IOException

createOutputStream

public CompressionOutputStream createOutputStream(OutputStream out,
                                                  Compressor compressor)
                                           throws IOException

Description copied from interface: CompressionCodec

Create a CompressionOutputStream that will write to the given OutputStream with the given Compressor.

Specified by:

createOutputStream in interface CompressionCodec

Parameters:

out - the location for the final output stream

compressor - compressor to use

Returns:

a stream the user can write uncompressed data to have it compressed

Throws:

IOException

getCompressorType

public Class<? extends Compressor> getCompressorType()

Description copied from interface: CompressionCodec

Get the type of Compressor needed by this CompressionCodec.

Specified by:

getCompressorType in interface CompressionCodec

Returns:

the type of compressor needed by this codec.

createCompressor

public Compressor createCompressor()

Description copied from interface: CompressionCodec

Create a new Compressor for use by this CompressionCodec.

Specified by:

createCompressor in interface CompressionCodec

Returns:

a new compressor for use by this codec

createInputStream

public CompressionInputStream createInputStream(InputStream in)
                                         throws IOException

Description copied from interface: CompressionCodec

Create a stream decompressor that will read from the given input stream.

Specified by:

createInputStream in interface CompressionCodec

Parameters:

in - the stream to read compressed bytes from

Returns:

a stream to read uncompressed bytes from

Throws:

IOException

createInputStream

public CompressionInputStream createInputStream(InputStream in,
                                                Decompressor decompressor)
                                         throws IOException

Description copied from interface: CompressionCodec

Create a CompressionInputStream that will read from the given InputStream with the given Decompressor.

Specified by:

createInputStream in interface CompressionCodec

Parameters:

in - the stream to read compressed bytes from

decompressor - decompressor to use

Returns:

a stream to read uncompressed bytes from

Throws:

IOException

getDecompressorType

public Class<? extends Decompressor> getDecompressorType()

Description copied from interface: CompressionCodec

Get the type of Decompressor needed by this CompressionCodec.

Specified by:

getDecompressorType in interface CompressionCodec

Returns:

the type of decompressor needed by this codec.

createDecompressor

public Decompressor createDecompressor()

Description copied from interface: CompressionCodec

Create a new Decompressor for use by this CompressionCodec.

Specified by:

createDecompressor in interface CompressionCodec

Returns:

a new decompressor for use by this codec

getDefaultExtension

public String getDefaultExtension()

Get the default filename extension for this kind of compression.

Specified by:

getDefaultExtension in interface CompressionCodec

Returns:

the extension including the '.'