org.h2.compress

Interface Compressor

All Known Implementing Classes:

CompressDeflate, CompressLZF, CompressNo

public interface Compressor

Each data compression algorithm must implement this interface.

Field Summary

Fields

Modifier and Type	Field and Description
static int	DEFLATE The DEFLATE compression algorithm is used.
static int	LZF The LZF compression algorithm is used
static int	NO No compression is used.

Method Summary

Methods

Modifier and Type	Method and Description
int	compress(byte[] in, 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.

Field Detail

NO

static final int NO

No compression is used.

See Also:

Constant Field Values

LZF

static final int LZF

The LZF compression algorithm is used

See Also:

Constant Field Values

DEFLATE

static final int DEFLATE

The DEFLATE compression algorithm is used.

See Also:

Constant Field Values

Method Detail

getAlgorithm

int getAlgorithm()

Get the compression algorithm type.

Returns:

the type

compress

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

Compress a number of bytes.

Parameters:

in - the input data

inLen - the number of bytes to compress

out - the output area

outPos - the offset at the output array

Returns:

the end position

expand

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

Expand a number of compressed bytes.

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

setOptions

void setOptions(String options)

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

Parameters:

options - the options