java.util.zip
Class DeflaterOutputStream

java.lang.Object
  java.io.OutputStream
      java.io.FilterOutputStream
          java.util.zip.DeflaterOutputStream

Direct Known Subclasses:

GZIPOutputStream, ZipOutputStream

public class DeflaterOutputStream

extends FilterOutputStream

This class implements an output stream filter for compressing data in the "deflate" compression format. It is also used as the basis for other types of compression filters, such as GZIPOutputStream.

Author:

David Connelly

See Also:

Deflater

Field Summary

protected byte[]	buf Output buffer for writing compressed data.
private boolean	closed Indicates that the stream has been closed.
protected Deflater	def Compressor for this stream.
(package private) boolean	usesDefaultDeflater

Fields inherited from class java.io.FilterOutputStream

out

Constructor Summary

DeflaterOutputStream(OutputStream out)
Creates a new output stream with a defaul compressor and buffer size.

DeflaterOutputStream(OutputStream out, Deflater def)
Creates a new output stream with the specified compressor and a default buffer size.

DeflaterOutputStream(OutputStream out, Deflater def, int size)
Creates a new output stream with the specified compressor and buffer size.

Method Summary

void	close() Writes remaining compressed data to the output stream and closes the underlying stream.
protected void	deflate() Writes next block of compressed data to the output stream.
void	finish() Finishes writing compressed data to the output stream without closing the underlying stream.
void	write(byte[] b, int off, int len) Writes an array of bytes to the compressed output stream.
void	write(int b) Writes a byte to the compressed output stream.

Methods inherited from class java.io.FilterOutputStream

flush, write

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

def

protected Deflater def

Compressor for this stream.

buf

protected byte[] buf

Output buffer for writing compressed data.

closed

private boolean closed

Indicates that the stream has been closed.

usesDefaultDeflater

boolean usesDefaultDeflater

Constructor Detail

DeflaterOutputStream

public DeflaterOutputStream(OutputStream out,
                            Deflater def,
                            int size)

Creates a new output stream with the specified compressor and buffer size.

Parameters:

out - the output stream

def - the compressor ("deflater")

size - the output buffer size

Throws:

IllegalArgumentException - if size is <= 0

DeflaterOutputStream

public DeflaterOutputStream(OutputStream out,
                            Deflater def)

Creates a new output stream with the specified compressor and a default buffer size.

Parameters:

out - the output stream

def - the compressor ("deflater")

DeflaterOutputStream

public DeflaterOutputStream(OutputStream out)

Creates a new output stream with a defaul compressor and buffer size.

Parameters:

out - the output stream

Method Detail

write

public void write(int b)
           throws IOException

Writes a byte to the compressed output stream. This method will block until the byte can be written.

Overrides:

write in class FilterOutputStream

Parameters:

b - the byte to be written

Throws:

IOException - if an I/O error has occurred

write

public void write(byte[] b,
                  int off,
                  int len)
           throws IOException

Writes an array of bytes to the compressed output stream. This method will block until all the bytes are written.

Overrides:

write in class FilterOutputStream

Parameters:

b - the data to be written

off - the start offset of the data

len - the length of the data

Throws:

IOException - if an I/O error has occurred

See Also:

FilterOutputStream.write(int)

finish

public void finish()
            throws IOException

Finishes writing compressed data to the output stream without closing the underlying stream. Use this method when applying multiple filters in succession to the same output stream.

Throws:

IOException - if an I/O error has occurred

close

public void close()
           throws IOException

Writes remaining compressed data to the output stream and closes the underlying stream.

Overrides:

close in class FilterOutputStream

Throws:

IOException - if an I/O error has occurred

See Also:

FilterOutputStream.flush(), FilterOutputStream.out

deflate

protected void deflate()
                throws IOException

Writes next block of compressed data to the output stream.

Throws:

IOException - if an I/O error has occurred