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.

Author:

Owen O'Malley

Nested Class Summary

protected static class	GzipCodec.GzipInputStream
protected static class	GzipCodec.GzipOutputStream A bridge that wraps around a DeflaterOutputStream to make it a CompressionOutputStream.

Constructor Summary

GzipCodec()

Method Summary

CompressionInputStream	createInputStream(InputStream in) Create a stream decompressor that will read from the given input stream.
CompressionOutputStream	createOutputStream(OutputStream out) Create a stream compressor that will write to the given output stream.
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

Create a stream compressor that will write to the given output stream.

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

Throws:

IOException

createInputStream

public CompressionInputStream createInputStream(InputStream in)
                                         throws IOException

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

getDefaultExtension

public String getDefaultExtension()

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 '.'