Package tigase.util

Class ZLibWrapper

java.lang.Object

tigase.util.ZLibWrapper

public class ZLibWrapper
extends java.lang.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:

$Rev$

Author:

Artur Hefczyc

Field Summary

Fields

Modifier and Type	Field	Description
static int	COMPRESSED_BUFF_SIZE
static int	DECOMPRESSED_BUFF_SIZE

Constructor Summary

Constructors

Constructor	Description
ZLibWrapper()
ZLibWrapper(int level)
ZLibWrapper(int level, int comp_buff_size)

Method Summary

Modifier and Type	Method	Description
float	averageCompressionRate()
float	averageDecompressionRate()
java.nio.ByteBuffer	compress(java.lang.String input)
java.nio.ByteBuffer	compress(java.nio.ByteBuffer input)
java.nio.ByteBuffer	decompress(java.nio.ByteBuffer input)
java.lang.String	decompressToString(java.nio.ByteBuffer input)
void	end()
float	lastCompressionRate()
float	lastDecompressionRate()
static void	main(java.lang.String[] args)
void	setIOListener(IOListener listener)

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

See Also:

Constant Field Values

DECOMPRESSED_BUFF_SIZE

public static final int DECOMPRESSED_BUFF_SIZE

See Also:

Constant Field Values

Constructor Detail

ZLibWrapper

public ZLibWrapper()

ZLibWrapper

public ZLibWrapper(int level)

ZLibWrapper

public ZLibWrapper(int level,
                   int comp_buff_size)

Method Detail

main

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

Throws:

java.lang.Exception

averageCompressionRate

public float averageCompressionRate()

averageDecompressionRate

public float averageDecompressionRate()

compress

public java.nio.ByteBuffer compress(java.nio.ByteBuffer input)

compress

public java.nio.ByteBuffer compress(java.lang.String input)
                             throws java.nio.charset.CharacterCodingException

Throws:

java.nio.charset.CharacterCodingException

decompress

public java.nio.ByteBuffer decompress(java.nio.ByteBuffer input)
                               throws java.io.IOException

Throws:

java.io.IOException

decompressToString

public java.lang.String decompressToString(java.nio.ByteBuffer input)
                                    throws java.nio.charset.CharacterCodingException,
                                           java.io.IOException

Throws:

java.nio.charset.CharacterCodingException

java.io.IOException

end

public void end()

lastCompressionRate

public float lastCompressionRate()

lastDecompressionRate

public float lastDecompressionRate()

setIOListener

public void setIOListener(IOListener listener)