tigase.util
Class ZLibWrapper

java.lang.Object
  tigase.util.ZLibWrapper

public class ZLibWrapper
extends Object

This is a warpper for java.util.zip package and Deflater/Inflater classes specifically. This implementation allows for easy interaction between Deflater/Inflater and java.nio API which operates on ByteBuffer data. It also does some tricky stuff to flush Deflater without reseting it and allow a better compression ration on the data.

There are a few convenience methods allowing to directly compress String to ByteBuffer and other way around - from ByteBuffer to String decompression. For these methods data are assumed to be UTF-8 character String.

Created: Jul 30, 2009 11:46:55 AM

Version:

$Rev: 644 $

Author:

Artur Hefczyc

Field Summary

static int	COMPRESSED_BUFF_SIZE Field description
static int	DECOMPRESSED_BUFF_SIZE Field description

Constructor Summary

ZLibWrapper()
Constructs ...

ZLibWrapper(int level)
Constructs ...

ZLibWrapper(int level, int comp_buff_size)
Constructs ...

Method Summary

float	averageCompressionRate() Method description
float	averageDecompressionRate() Method description
ByteBuffer	compress(ByteBuffer input)
ByteBuffer	compress(String input) Method description
ByteBuffer	decompress(ByteBuffer input) Method description
String	decompressToString(ByteBuffer input) Method description
void	end() Method description
float	lastCompressionRate() Method description
float	lastDecompressionRate() Method description
static void	main(String[] args) Method description

Methods inherited from class java.lang.Object

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

Field Detail

COMPRESSED_BUFF_SIZE

public static final int COMPRESSED_BUFF_SIZE

Field description

See Also:

Constant Field Values

DECOMPRESSED_BUFF_SIZE

public static final int DECOMPRESSED_BUFF_SIZE

Field description

See Also:

Constant Field Values

Constructor Detail

ZLibWrapper

public ZLibWrapper()

Constructs ...

ZLibWrapper

public ZLibWrapper(int level)

Constructs ...

Parameters:

level -

ZLibWrapper

public ZLibWrapper(int level,
                   int comp_buff_size)

Constructs ...

Parameters:

level -

comp_buff_size -

Method Detail

main

public static void main(String[] args)
                 throws Exception

Method description

Parameters:

args -

Throws:

Exception

averageCompressionRate

public float averageCompressionRate()

Method description

Returns:

averageDecompressionRate

public float averageDecompressionRate()

Method description

Returns:

compress

public ByteBuffer compress(ByteBuffer input)

Parameters:

input -

Returns:

compress

public ByteBuffer compress(String input)
                    throws CharacterCodingException

Method description

Parameters:

input -

Returns:

Throws:

CharacterCodingException

decompress

public ByteBuffer decompress(ByteBuffer input)

Method description

Parameters:

input -

Returns:

decompressToString

public String decompressToString(ByteBuffer input)
                          throws CharacterCodingException

Method description

Parameters:

input -

Returns:

Throws:

CharacterCodingException

end

public void end()

Method description

lastCompressionRate

public float lastCompressionRate()

Method description

Returns:

lastDecompressionRate

public float lastDecompressionRate()

Method description

Returns: