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Class DeflaterOutputStream

All Implemented Interfaces:
Closeable, Flushable, AutoCloseable
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.

See Also:
Deflater

Fields

def

protected Deflater def

Compressor for this stream.

buf

protected byte[] buf

Output buffer for writing compressed data.

Constructors

DeflaterOutputStream

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

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

Parameters:
out - the output stream
def - the compressor ("deflater")
size - the output buffer size
syncFlush - if true the flush() method of this instance flushes the compressor with flush mode Deflater.SYNC_FLUSH before flushing the output stream, otherwise only flushes the output stream
Throws:
IllegalArgumentException - if size <= 0
Since:
1.7

DeflaterOutputStream

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

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

The new output stream instance is created as if by invoking the 4-argument constructor DeflaterOutputStream(out, def, size, false).

Parameters:
out - the output stream
def - the compressor ("deflater")
size - the output buffer size
Throws:
IllegalArgumentException - if size <= 0

DeflaterOutputStream

public DeflaterOutputStream(OutputStream out,
                            Deflater def,
                            boolean syncFlush)

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

Parameters:
out - the output stream
def - the compressor ("deflater")
syncFlush - if true the flush() method of this instance flushes the compressor with flush mode Deflater.SYNC_FLUSH before flushing the output stream, otherwise only flushes the output stream
Since:
1.7

DeflaterOutputStream

public DeflaterOutputStream(OutputStream out,
                            Deflater def)

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

The new output stream instance is created as if by invoking the 3-argument constructor DeflaterOutputStream(out, def, false).

Parameters:
out - the output stream
def - the compressor ("deflater")

DeflaterOutputStream

public DeflaterOutputStream(OutputStream out,
                            boolean syncFlush)

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

Parameters:
out - the output stream
syncFlush - if true the flush() method of this instance flushes the compressor with flush mode Deflater.SYNC_FLUSH before flushing the output stream, otherwise only flushes the output stream
Since:
1.7

DeflaterOutputStream

public DeflaterOutputStream(OutputStream out)

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

The new output stream instance is created as if by invoking the 2-argument constructor DeflaterOutputStream(out, false).

Parameters:
out - the output stream

Methods

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.

Specified by:
close in interface Closeable
Specified by:
close in interface AutoCloseable
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

flush

public void flush()
           throws IOException

Flushes the compressed output stream. If syncFlush is true when this compressed output stream is constructed, this method first flushes the underlying compressor with the flush mode Deflater.SYNC_FLUSH to force all pending data to be flushed out to the output stream and then flushes the output stream. Otherwise this method only flushes the output stream without flushing the compressor.

Specified by:
flush in interface Flushable
Overrides:
flush in class FilterOutputStream
Throws:
IOException - if an I/O error has occurred
Since:
1.7
See Also:
FilterOutputStream.out

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