Package org.h2.compress
Interface Compressor
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- All Known Implementing Classes:
CompressDeflate
,CompressLZF
,CompressNo
public interface Compressor
Each data compression algorithm must implement this interface.
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Method Summary
All Methods Instance Methods Abstract Methods 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(java.lang.String options)
Set the compression options.
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Field Detail
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NO
static final int NO
No compression is used.- See Also:
- Constant Field Values
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LZF
static final int LZF
The LZF compression algorithm is used- See Also:
- Constant Field Values
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DEFLATE
static final int DEFLATE
The DEFLATE compression algorithm is used.- See Also:
- Constant Field Values
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Method Detail
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getAlgorithm
int getAlgorithm()
Get the compression algorithm type.- Returns:
- the type
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compress
int compress(byte[] in, int inPos, int inLen, byte[] out, int outPos)
Compress a number of bytes.- Parameters:
in
- the input datainPos
- the offset at the input arrayinLen
- the number of bytes to compressout
- the output areaoutPos
- the offset at the output array- Returns:
- the end position
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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 datainPos
- the offset at the input arrayinLen
- the number of bytes to readout
- the output areaoutPos
- the offset at the output arrayoutLen
- the size of the uncompressed data
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setOptions
void setOptions(java.lang.String options)
Set the compression options. This may include settings for higher performance but less compression.- Parameters:
options
- the options
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