com.ning.compress.lzf.util
Class LZFFileOutputStream

java.lang.Object
  java.io.OutputStream
      java.io.FileOutputStream
          com.ning.compress.lzf.util.LZFFileOutputStream

All Implemented Interfaces:

Closeable, Flushable

public class LZFFileOutputStream
extends FileOutputStream

Helper class that allows use of LZF compression even if a library requires use of FileOutputStream.

Note that use of this class is not recommended unless you absolutely must use a FileOutputStream instance; otherwise basic LZFOutputStream (which uses aggregation for underlying streams) is more appropriate

Implementation note: much of the code is just copied from LZFOutputStream, so care must be taken to keep implementations in sync if there are fixes.

Since:

0.8

Field Summary

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

Constructor Summary

LZFFileOutputStream(File file)

LZFFileOutputStream(File file, boolean append)

LZFFileOutputStream(FileDescriptor fdObj)

LZFFileOutputStream(String name)

LZFFileOutputStream(String name, boolean append)

Method Summary

void	close()
LZFFileOutputStream	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
protected void	rawWrite(byte[] buffer, int offset, int length)
LZFFileOutputStream	setFinishBlockOnFlush(boolean b) Method for defining whether call to flush() will also complete current block (similar to calling finishBlock()) or not.
void	write(byte[] b)
void	write(byte[] buffer, int offset, int length)
void	write(int b)
protected void	writeCompressedBlock() Compress and write the current block to the OutputStream

Methods inherited from class java.io.FileOutputStream

finalize, getChannel, getFD

Methods inherited from class java.lang.Object

clone, equals, 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'

Since:

0.8

_outputStreamClosed

protected boolean _outputStreamClosed

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

Constructor Detail

LZFFileOutputStream

public LZFFileOutputStream(File file)
                    throws FileNotFoundException

Throws:

FileNotFoundException

LZFFileOutputStream

public LZFFileOutputStream(File file,
                           boolean append)
                    throws FileNotFoundException

Throws:

FileNotFoundException

LZFFileOutputStream

public LZFFileOutputStream(FileDescriptor fdObj)

LZFFileOutputStream

public LZFFileOutputStream(String name)
                    throws FileNotFoundException

Throws:

FileNotFoundException

LZFFileOutputStream

public LZFFileOutputStream(String name,
                           boolean append)
                    throws FileNotFoundException

Throws:

FileNotFoundException

Method Detail

setFinishBlockOnFlush

public LZFFileOutputStream setFinishBlockOnFlush(boolean b)

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

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Overrides:

close in class FileOutputStream

Throws:

IOException

flush

public void flush()
           throws IOException

Specified by:

flush in interface Flushable

Overrides:

flush in class OutputStream

Throws:

IOException

write

public void write(byte[] b)
           throws IOException

Overrides:

write in class FileOutputStream

Throws:

IOException

write

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

Overrides:

write in class FileOutputStream

Throws:

IOException

write

public void write(int b)
           throws IOException

Overrides:

write in class FileOutputStream

Throws:

IOException

getFinishBlockOnFlush

public boolean getFinishBlockOnFlush()

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

finishBlock

public LZFFileOutputStream 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

rawWrite

protected void rawWrite(byte[] buffer,
                        int offset,
                        int length)
                 throws IOException

Throws:

IOException