org.h2.compress

接口 Compressor

所有已知实现类:

CompressDeflate, CompressLZF, CompressNo

public interface Compressor

Each data compression algorithm must implement this interface.

字段概要

字段

限定符和类型	字段和说明
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.

方法概要

限定符和类型	方法和说明
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.

字段详细资料

NO

static final int NO

No compression is used.

另请参阅:

常量字段值

LZF

static final int LZF

The LZF compression algorithm is used

另请参阅:

常量字段值

DEFLATE

static final int DEFLATE

The DEFLATE compression algorithm is used.

另请参阅:

常量字段值

方法详细资料

getAlgorithm

int getAlgorithm()

Get the compression algorithm type.

返回:

the type

compress

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

Compress a number of bytes.

参数:

in - the input data

inLen - the number of bytes to compress

out - the output area

outPos - the offset at the output array

返回:

the end position

expand

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

Expand a number of compressed bytes.

参数:

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.

参数:

options - the options