public Deflater() 
{
        this(DEFAULT_COMPRESSION, false);
}

Creates a new compressor with the default compression level. Compressed data will be generated in ZLIB format.

 public Deflater(int level) 
{
        this(level, false);
}

Creates a new compressor using the specified compression level. Compressed data will be generated in ZLIB format.

Parameters:

level - the compression level (0-9)

 public Deflater(int level,
    boolean nowrap) 
{
     
        /* Zip library is loaded from System.initializeSystemClass */
        initIDs();
        this.level = level;
        this.strategy = DEFAULT_STRATEGY;
        strm = init(level, DEFAULT_STRATEGY, nowrap);
}

Creates a new compressor using the specified compression level. If 'nowrap' is true then the ZLIB header and checksum fields will not be used in order to support the compression format used in both GZIP and PKZIP.

Parameters:

level - the compression level (0-9)

nowrap - if true then use GZIP compatible compression

 public int deflate(byte[] b) 
{
        return deflate(b, 0, b.length);
}

Fills specified buffer with compressed data. Returns actual number of bytes of compressed data. A return value of 0 indicates that needsInput() should be called in order to determine if more input data is required.

 public synchronized int deflate(byte[] b,
    int off,
    int len) 
{
        if (b == null) {
            throw new NullPointerException();
        }
        if (off <  0 || len <  0 || off  > b.length - len) {
            throw new ArrayIndexOutOfBoundsException();
        }
        return deflateBytes(b, off, len);
}

Fills specified buffer with compressed data. Returns actual number of bytes of compressed data. A return value of 0 indicates that needsInput() should be called in order to determine if more input data is required.

 public synchronized  void end() 
{
        if (strm != 0) {
            end(strm);
            strm = 0;
            buf = null;
        }
}

Closes the compressor and discards any unprocessed input. This method should be called when the compressor is no longer being used, but will also be called automatically by the finalize() method. Once this method is called, the behavior of the Deflater object is undefined.

 protected  void finalize() 
{
        end();
}

Closes the compressor when garbage is collected.

 public synchronized  void finish() 
{
        finish = true;
}

When called, indicates that compression should end with the current contents of the input buffer.

 public synchronized boolean finished() 
{
        return finished;
}

Returns true if the end of the compressed data output stream has been reached.

 public synchronized int getAdler() 
{
        ensureOpen();
        return getAdler(strm);
}

Returns the ADLER-32 value of the uncompressed data.

 public synchronized long getBytesRead() 
{
        ensureOpen();
        return getBytesRead(strm);
}

Returns the total number of uncompressed bytes input so far.

 public synchronized long getBytesWritten() 
{
        ensureOpen();
        return getBytesWritten(strm);
}

Returns the total number of compressed bytes output so far.

 public int getTotalIn() 
{
        return (int) getBytesRead();
}

Returns the total number of uncompressed bytes input so far.

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 int getTotalOut() 
{
        return (int) getBytesWritten();
}

Returns the total number of compressed bytes output so far.

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 boolean needsInput() 
{
        return len < = 0;
}

Returns true if the input data buffer is empty and setInput() should be called in order to provide more input.

 public synchronized  void reset() 
{
        ensureOpen();
        reset(strm);
        finish = false;
        finished = false;
        off = len = 0;
}

Resets deflater so that a new set of input data can be processed. Keeps current compression level and strategy settings.

 public  void setDictionary(byte[] b) 
{
        setDictionary(b, 0, b.length);
}

Sets preset dictionary for compression. A preset dictionary is used when the history buffer can be predetermined. When the data is later uncompressed with Inflater.inflate(), Inflater.getAdler() can be called in order to get the Adler-32 value of the dictionary required for decompression.

 public synchronized  void setDictionary(byte[] b,
    int off,
    int len) 
{
        if (strm == 0 || b == null) {
            throw new NullPointerException();
        }
        if (off <  0 || len <  0 || off  > b.length - len) {
            throw new ArrayIndexOutOfBoundsException();
        }
        setDictionary(strm, b, off, len);
}

Sets preset dictionary for compression. A preset dictionary is used when the history buffer can be predetermined. When the data is later uncompressed with Inflater.inflate(), Inflater.getAdler() can be called in order to get the Adler-32 value of the dictionary required for decompression.

 public  void setInput(byte[] b) 
{
        setInput(b, 0, b.length);
}

Sets input data for compression. This should be called whenever needsInput() returns true indicating that more input data is required.

 public synchronized  void setInput(byte[] b,
    int off,
    int len) 
{
        if (b== null) {
            throw new NullPointerException();
        }
        if (off <  0 || len <  0 || off  > b.length - len) {
            throw new ArrayIndexOutOfBoundsException();
        }
        this.buf = b;
        this.off = off;
        this.len = len;
}

Sets input data for compression. This should be called whenever needsInput() returns true indicating that more input data is required.

 public synchronized  void setLevel(int level) 
{
        if ((level <  0 || level  > 9) && level != DEFAULT_COMPRESSION) {
            throw new IllegalArgumentException("invalid compression level");
        }
        if (this.level != level) {
            this.level = level;
            setParams = true;
        }
}

Sets the current compression level to the specified value.

 public synchronized  void setStrategy(int strategy) 
{
        switch (strategy) {
          case DEFAULT_STRATEGY:
          case FILTERED:
          case HUFFMAN_ONLY:
            break;
          default:
            throw new IllegalArgumentException();
        }
        if (this.strategy != strategy) {
            this.strategy = strategy;
            setParams = true;
        }
}

Sets the compression strategy to the specified value.