Package org.apache.hadoop.io.compress

Interface CompressionCodec

All Known Subinterfaces:

DirectDecompressionCodec, SplittableCompressionCodec

All Known Implementing Classes:

BZip2Codec, DefaultCodec, GzipCodec, PassthroughCodec

@Public
@Evolving
public interface CompressionCodec

This class encapsulates a streaming compression/decompression pair.

Nested Class Summary

Nested Classes

Modifier and Type	Interface	Description
static class	org.apache.hadoop.io.compress.CompressionCodec.Util

Method Summary

Modifier and Type	Method	Description
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 CompressionInputStream 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.

Method Details

createOutputStream

CompressionOutputStream createOutputStream(OutputStream out)
                                    throws IOException

Create a CompressionOutputStream that will write to the given OutputStream.

Parameters:

out - the location for the final output stream

Returns:

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

Throws:

IOException - raised on errors performing I/O.

createOutputStream

CompressionOutputStream createOutputStream(OutputStream out,
 Compressor compressor)
                                    throws IOException

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

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 - raised on errors performing I/O.

getCompressorType

Class<? extends Compressor> getCompressorType()

Get the type of Compressor needed by this CompressionCodec.

Returns:

the type of compressor needed by this codec.

createCompressor

Compressor createCompressor()

Create a new Compressor for use by this CompressionCodec.

Returns:

a new compressor for use by this codec

createInputStream

CompressionInputStream createInputStream(InputStream in)
                                  throws IOException

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

Parameters:

in - the stream to read compressed bytes from

Returns:

a stream to read uncompressed bytes from

Throws:

IOException - raised on errors performing I/O.

createInputStream

CompressionInputStream createInputStream(InputStream in,
 Decompressor decompressor)
                                  throws IOException

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

Parameters:

in - the stream to read compressed bytes from

decompressor - decompressor to use

Returns:

a stream to read uncompressed bytes from

Throws:

IOException - raised on errors performing I/O.

getDecompressorType

Class<? extends Decompressor> getDecompressorType()

Get the type of Decompressor needed by this CompressionCodec.

Returns:

the type of decompressor needed by this codec.

createDecompressor

Decompressor createDecompressor()

Create a new Decompressor for use by this CompressionCodec.

Returns:

a new decompressor for use by this codec

getDefaultExtension

String getDefaultExtension()

Get the default filename extension for this kind of compression.

Returns:

the extension including the '.'