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JavaTM 2 Platform Std. Ed. v1.5.0
java.util.zip
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Field Summary | |
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static int |
BEST_COMPRESSION
Compression level for best compression. |
static int |
BEST_SPEED
Compression level for fastest compression. |
static int |
DEFAULT_COMPRESSION
Default compression level. |
static int |
DEFAULT_STRATEGY
Default compression strategy. |
static int |
DEFLATED
Compression method for the deflate algorithm (the only one currently supported). |
static int |
FILTERED
Compression strategy best used for data consisting mostly of small values with a somewhat random distribution. |
static int |
HUFFMAN_ONLY
Compression strategy for Huffman coding only. |
static int |
NO_COMPRESSION
Compression level for no compression. |
Constructor Summary | |
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Deflater()
Creates a new compressor with the default compression level. |
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Deflater(int level)
Creates a new compressor using the specified compression level. |
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Deflater(int level,
boolean nowrap)
Creates a new compressor using the specified compression level. |
Method Summary | |
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int |
deflate(byte[] b)
Fills specified buffer with compressed data. |
int |
deflate(byte[] b,
int off,
int len)
Fills specified buffer with compressed data. |
void |
end()
Closes the compressor and discards any unprocessed input. |
protected void |
finalize()
Closes the compressor when garbage is collected. |
void |
finish()
When called, indicates that compression should end with the current contents of the input buffer. |
boolean |
finished()
Returns true if the end of the compressed data output stream has been reached. |
int |
getAdler()
Returns the ADLER-32 value of the uncompressed data. |
long |
getBytesRead()
Returns the total number of uncompressed bytes input so far. |
long |
getBytesWritten()
Returns the total number of compressed bytes output so far. |
int |
getTotalIn()
Returns the total number of uncompressed bytes input so far. |
int |
getTotalOut()
Returns the total number of compressed bytes output so far. |
boolean |
needsInput()
Returns true if the input data buffer is empty and setInput() should be called in order to provide more input. |
void |
reset()
Resets deflater so that a new set of input data can be processed. |
void |
setDictionary(byte[] b)
Sets preset dictionary for compression. |
void |
setDictionary(byte[] b,
int off,
int len)
Sets preset dictionary for compression. |
void |
setInput(byte[] b)
Sets input data for compression. |
void |
setInput(byte[] b,
int off,
int len)
Sets input data for compression. |
void |
setLevel(int level)
Sets the current compression level to the specified value. |
void |
setStrategy(int strategy)
Sets the compression strategy to the specified value. |
Methods inherited from class java.lang.Object |
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clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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public static final int DEFLATED
public static final int NO_COMPRESSION
public static final int BEST_SPEED
public static final int BEST_COMPRESSION
public static final int DEFAULT_COMPRESSION
public static final int FILTERED
public static final int HUFFMAN_ONLY
public static final int DEFAULT_STRATEGY
Constructor Detail |
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public Deflater(int level, boolean nowrap)
level
- the compression level (0-9)nowrap
- if true then use GZIP compatible compressionpublic Deflater(int level)
level
- the compression level (0-9)public Deflater()
Method Detail |
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public void setInput(byte[] b, int off, int len)
b
- the input data bytesoff
- the start offset of the datalen
- the length of the dataneedsInput()
public void setInput(byte[] b)
b
- the input data bytesneedsInput()
public void setDictionary(byte[] b, int off, int len)
b
- the dictionary data bytesoff
- the start offset of the datalen
- the length of the dataInflater.inflate(byte[], int, int)
,
Inflater.getAdler()
public void setDictionary(byte[] b)
b
- the dictionary data bytesInflater.inflate(byte[], int, int)
,
Inflater.getAdler()
public void setStrategy(int strategy)
strategy
- the new compression strategy
IllegalArgumentException
- if the compression strategy is
invalidpublic void setLevel(int level)
level
- the new compression level (0-9)
IllegalArgumentException
- if the compression level is invalidpublic boolean needsInput()
public void finish()
public boolean finished()
public int deflate(byte[] b, int off, int len)
b
- the buffer for the compressed dataoff
- the start offset of the datalen
- the maximum number of bytes of compressed data
public int deflate(byte[] b)
b
- the buffer for the compressed data
public int getAdler()
public int getTotalIn()
Since the number of bytes may be greater than
Integer.MAX_VALUE, the getBytesRead()
method is now
the preferred means of obtaining this information.
public long getBytesRead()
public int getTotalOut()
Since the number of bytes may be greater than
Integer.MAX_VALUE, the getBytesWritten()
method is now
the preferred means of obtaining this information.
public long getBytesWritten()
public void reset()
public void end()
protected void finalize()