org.apache.hadoop.io.compress
Class GzipCodec

java.lang.Object
  org.apache.hadoop.io.compress.DefaultCodec
      org.apache.hadoop.io.compress.GzipCodec

All Implemented Interfaces:

Configurable, CompressionCodec

public class GzipCodec
extends DefaultCodec

This class creates gzip compressors/decompressors.

Nested Class Summary

protected static class

GzipCodec.GzipOutputStream A bridge that wraps around a DeflaterOutputStream to make it a CompressionOutputStream.

Constructor Summary

GzipCodec()

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.
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.

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

getConf, setConf

Methods inherited from class java.lang.Object

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

Constructor Detail

GzipCodec

public GzipCodec()

Method Detail

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

Overrides:

createOutputStream in class DefaultCodec

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

Overrides:

createOutputStream in class DefaultCodec

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

createCompressor

public Compressor createCompressor()

Description copied from interface: CompressionCodec

Create a new Compressor for use by this CompressionCodec.

Specified by:

createCompressor in interface CompressionCodec

Overrides:

createCompressor in class DefaultCodec

Returns:

a new compressor for use by this codec

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

Overrides:

getCompressorType in class DefaultCodec

Returns:

the type of compressor needed 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

Overrides:

createInputStream in class DefaultCodec

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

Overrides:

createInputStream in class DefaultCodec

Parameters:

in - the stream to read compressed bytes from

decompressor - decompressor to use

Returns:

a stream to read uncompressed bytes from

Throws:

IOException

createDecompressor

public Decompressor createDecompressor()

Description copied from interface: CompressionCodec

Create a new Decompressor for use by this CompressionCodec.

Specified by:

createDecompressor in interface CompressionCodec

Overrides:

createDecompressor in class DefaultCodec

Returns:

a new decompressor for use by this codec

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

Overrides:

getDecompressorType in class DefaultCodec

Returns:

the type of decompressor needed by this codec.

getDefaultExtension

public String getDefaultExtension()

Description copied from interface: CompressionCodec

Get the default filename extension for this kind of compression.

Specified by:

getDefaultExtension in interface CompressionCodec

Overrides:

getDefaultExtension in class DefaultCodec

Returns:

the extension including the '.'