Package com.ning.compress.lzf

Class LZFOutputStream

java.lang.Object

java.io.OutputStream

java.io.FilterOutputStream

com.ning.compress.lzf.LZFOutputStream

All Implemented Interfaces:

Closeable, Flushable, AutoCloseable, Channel, WritableByteChannel

public class LZFOutputStream
extends FilterOutputStream
implements WritableByteChannel

Decorator OutputStream implementation that will compress output using LZF compression algorithm, given uncompressed input to write. Its counterpart is LZFInputStream; although in some ways LZFCompressingInputStream can be seen as the opposite.

Author:

jon hartlaub, Tatu Saloranta

See Also:

LZFInputStream, LZFCompressingInputStream

Field Summary

Fields

Modifier and Type	Field	Description
protected boolean	_cfgFinishBlockOnFlush	Configuration setting that governs whether basic 'flush()' should first complete a block or not.
protected byte[]	_outputBuffer
protected boolean	_outputStreamClosed	Flag that indicates if we have already called '_outputStream.close()' (to avoid calling it multiple times)
protected int	_position

Fields inherited from class java.io.FilterOutputStream

out

Constructor Summary

Constructors

Constructor	Description
LZFOutputStream(ChunkEncoder encoder, OutputStream outputStream)
LZFOutputStream(ChunkEncoder encoder, OutputStream outputStream, int bufferSize, BufferRecycler bufferRecycler)
LZFOutputStream(ChunkEncoder encoder, OutputStream outputStream, BufferRecycler bufferRecycler)
LZFOutputStream(OutputStream outputStream)
LZFOutputStream(OutputStream outputStream, BufferRecycler bufferRecycler)

Method Summary

Modifier and Type	Method	Description
protected void	checkNotClosed()
void	close()
LZFOutputStream	finishBlock()	Method that can be used to force completion of the current block, which means that all buffered data will be compressed into an LZF block.
void	flush()
boolean	getFinishBlockOnFlush()	Accessor for checking whether call to "flush()" will first finish the current block or not.
OutputStream	getUnderlyingOutputStream()	Method that can be used to find underlying OutputStream that we write encoded LZF encoded data into, after compressing it.
boolean	isOpen()
LZFOutputStream	setFinishBlockOnFlush(boolean b)	Method for defining whether call to flush() will also complete current block (similar to calling finishBlock()) or not.
void	write(byte[] buffer, int offset, int length)
void	write(int singleByte)
void	write(InputStream in)
int	write(ByteBuffer src)
void	write(FileChannel in)
protected void	writeCompressedBlock()	Compress and write the current block to the OutputStream

Methods inherited from class java.io.FilterOutputStream

write

Methods inherited from class java.io.OutputStream

nullOutputStream

Methods inherited from class java.lang.Object

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

Field Detail

_outputBuffer

protected byte[] _outputBuffer

_position

protected int _position

_cfgFinishBlockOnFlush

protected boolean _cfgFinishBlockOnFlush

Configuration setting that governs whether basic 'flush()' should first complete a block or not.

Default value is 'true'

_outputStreamClosed

protected boolean _outputStreamClosed

Flag that indicates if we have already called '_outputStream.close()' (to avoid calling it multiple times)

Constructor Detail

LZFOutputStream

public LZFOutputStream(OutputStream outputStream)

LZFOutputStream

public LZFOutputStream(ChunkEncoder encoder,
                       OutputStream outputStream)

LZFOutputStream

public LZFOutputStream(OutputStream outputStream,
                       BufferRecycler bufferRecycler)

LZFOutputStream

public LZFOutputStream(ChunkEncoder encoder,
                       OutputStream outputStream,
                       BufferRecycler bufferRecycler)

LZFOutputStream

public LZFOutputStream(ChunkEncoder encoder,
                       OutputStream outputStream,
                       int bufferSize,
                       BufferRecycler bufferRecycler)

Method Detail

setFinishBlockOnFlush

public LZFOutputStream setFinishBlockOnFlush(boolean b)

Method for defining whether call to flush() will also complete current block (similar to calling finishBlock()) or not.

write

public void write(int singleByte)
           throws IOException

Overrides:

write in class FilterOutputStream

Throws:

IOException

write

public void write(byte[] buffer,
                  int offset,
                  int length)
           throws IOException

Overrides:

write in class FilterOutputStream

Throws:

IOException

write

public void write(InputStream in)
           throws IOException

Throws:

IOException

write

public void write(FileChannel in)
           throws IOException

Throws:

IOException

write

public int write(ByteBuffer src)
          throws IOException

Specified by:

write in interface WritableByteChannel

Throws:

IOException

flush

public void flush()
           throws IOException

Specified by:

flush in interface Flushable

Overrides:

flush in class FilterOutputStream

Throws:

IOException

isOpen

public boolean isOpen()

Specified by:

isOpen in interface Channel

close

public void close()
           throws IOException

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Channel

Specified by:

close in interface Closeable

Overrides:

close in class FilterOutputStream

Throws:

IOException

getUnderlyingOutputStream

public OutputStream getUnderlyingOutputStream()

Method that can be used to find underlying OutputStream that we write encoded LZF encoded data into, after compressing it. Will never return null; although underlying stream may be closed (if this stream has been closed).

getFinishBlockOnFlush

public boolean getFinishBlockOnFlush()

Accessor for checking whether call to "flush()" will first finish the current block or not.

finishBlock

public LZFOutputStream finishBlock()
                            throws IOException

Method that can be used to force completion of the current block, which means that all buffered data will be compressed into an LZF block. This typically results in lower compression ratio as larger blocks compress better; but may be necessary for network connections to ensure timely sending of data.

Throws:

IOException

writeCompressedBlock

protected void writeCompressedBlock()
                             throws IOException

Compress and write the current block to the OutputStream

Throws:

IOException

checkNotClosed

protected void checkNotClosed()
                       throws IOException

Throws:

IOException