Package org.h2.compress

Class CompressDeflate

java.lang.Object

org.h2.compress.CompressDeflate

All Implemented Interfaces:

Compressor

public class CompressDeflate
extends Object
implements Compressor

This is a wrapper class for the Deflater class. This algorithm supports the following options:

• l or level: -1 (default), 0 (no compression), 1 (best speed), ..., 9 (best compression)
• s or strategy: 0 (default), 1 (filtered), 2 (huffman only)

See also java.util.zip.Deflater for details.

Field Summary

Fields inherited from interface org.h2.compress.Compressor

DEFLATE, LZF, NO

Constructor Summary

Constructors

Constructor	Description
CompressDeflate()

Method Summary

Modifier and Type	Method	Description
int	compress(byte[] in, int inPos, int inLen, byte[] out, int outPos)	Compress a number of bytes.
void	expand(byte[] in, int inPos, int inLen, byte[] out, int outPos, int outLen)	Expand a number of compressed bytes.
int	getAlgorithm()	Get the compression algorithm type.
void	setOptions(String options)	Set the compression options.

Methods inherited from class java.lang.Object

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

Constructor Details

CompressDeflate

public CompressDeflate()

Method Details

setOptions

public void setOptions(String options)

Description copied from interface: Compressor

Set the compression options. This may include settings for higher performance but less compression.

Specified by:

setOptions in interface Compressor

Parameters:

options - the options

compress

public int compress(byte[] in,
 int inPos,
 int inLen,
 byte[] out,
 int outPos)

Description copied from interface: Compressor

Compress a number of bytes.

Specified by:

compress in interface Compressor

Parameters:

in - the input data

inPos - the offset at the input array

inLen - the number of bytes to compress

out - the output area

outPos - the offset at the output array

Returns:

the end position

getAlgorithm

public int getAlgorithm()

Description copied from interface: Compressor

Get the compression algorithm type.

Specified by:

getAlgorithm in interface Compressor

Returns:

the type

expand

public void expand(byte[] in,
 int inPos,
 int inLen,
 byte[] out,
 int outPos,
 int outLen)

Description copied from interface: Compressor

Expand a number of compressed bytes.

Specified by:

expand in interface Compressor

Parameters:

in - the compressed data

inPos - the offset at the input array

inLen - the number of bytes to read

out - the output area

outPos - the offset at the output array

outLen - the size of the uncompressed data