Package com.github.luben.zstd

Class ZstdOutputStream

java.lang.Object

java.io.OutputStream

java.io.FilterOutputStream

com.github.luben.zstd.ZstdOutputStream

All Implemented Interfaces:

java.io.Closeable, java.io.Flushable

public class ZstdOutputStream
extends java.io.FilterOutputStream

OutputStream filter that compresses the data using Zstd compression

Field Summary

Fields inherited from class java.io.FilterOutputStream

out

Constructor Summary

Constructors

Constructor	Description
ZstdOutputStream(java.io.OutputStream outStream)	create a new compressing OutputStream
ZstdOutputStream(java.io.OutputStream outStream, int level)	create a new compressing OutputStream
ZstdOutputStream(java.io.OutputStream outStream, int level, boolean closeFrameOnFlush)	Deprecated. Use ZstdOutputStream() or ZstdOutputStream(level) and set the other params with the setters
ZstdOutputStream(java.io.OutputStream outStream, int level, boolean closeFrameOnFlush, boolean useChecksums)	Deprecated. Use ZstdOutputStream() or ZstdOutputStream(level) and set the other params with the setters
ZstdOutputStream(java.io.OutputStream outStream, BufferPool bufferPool)	create a new compressing OutputStream
ZstdOutputStream(java.io.OutputStream outStream, BufferPool bufferPool, int level)	create a new compressing OutputStream

Method Summary

Modifier and Type	Method	Description
void	close()
protected void	finalize()
void	flush()	Flushes the output
static long	recommendedCOutSize()
ZstdOutputStream	setChecksum(boolean useChecksums)	Enable checksums for the compressed stream.
ZstdOutputStream	setCloseFrameOnFlush(boolean closeOnFlush)	Enable closing the frame on flush.
ZstdOutputStream	setDict(byte[] dict)
ZstdOutputStream	setDict(ZstdDictCompress dict)
void	setFinalize(boolean finalize)	Deprecated. If you don't rely on finalizers, use `ZstdOutputStreamNoFinalizer` instead.
ZstdOutputStream	setLevel(int level)	Set the compression level.
ZstdOutputStream	setLong(int windowLog)	Set the Long Distance Matching.
ZstdOutputStream	setWorkers(int n)	Enable use of worker threads for parallel compression.
void	write(byte[] src, int offset, int len)
void	write(int i)

Methods inherited from class java.io.FilterOutputStream

write

Methods inherited from class java.lang.Object

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

Constructor Detail

ZstdOutputStream

@Deprecated
public ZstdOutputStream(java.io.OutputStream outStream,
                        int level,
                        boolean closeFrameOnFlush,
                        boolean useChecksums)
                 throws java.io.IOException

Deprecated.

Use ZstdOutputStream() or ZstdOutputStream(level) and set the other params with the setters

Throws:

java.io.IOException

ZstdOutputStream

@Deprecated
public ZstdOutputStream(java.io.OutputStream outStream,
                        int level,
                        boolean closeFrameOnFlush)
                 throws java.io.IOException

Deprecated.

Use ZstdOutputStream() or ZstdOutputStream(level) and set the other params with the setters

Throws:

java.io.IOException

ZstdOutputStream

public ZstdOutputStream(java.io.OutputStream outStream,
                        int level)
                 throws java.io.IOException

create a new compressing OutputStream

Parameters:

outStream - the stream to wrap

level - the compression level

Throws:

java.io.IOException

ZstdOutputStream

public ZstdOutputStream(java.io.OutputStream outStream)
                 throws java.io.IOException

create a new compressing OutputStream

Parameters:

outStream - the stream to wrap

Throws:

java.io.IOException

ZstdOutputStream

public ZstdOutputStream(java.io.OutputStream outStream,
                        BufferPool bufferPool,
                        int level)
                 throws java.io.IOException

create a new compressing OutputStream

Parameters:

outStream - the stream to wrap

bufferPool - the pool to fetch and return buffers

Throws:

java.io.IOException

ZstdOutputStream

public ZstdOutputStream(java.io.OutputStream outStream,
                        BufferPool bufferPool)
                 throws java.io.IOException

create a new compressing OutputStream

Parameters:

outStream - the stream to wrap

bufferPool - the pool to fetch and return buffers

Throws:

java.io.IOException

Method Detail

setFinalize

@Deprecated
public void setFinalize(boolean finalize)

Deprecated.

If you don't rely on finalizers, use `ZstdOutputStreamNoFinalizer` instead.

Enable or disable class finalizers If finalizers are disabled the responsibility fir calling the `close` method is on the consumer.

Parameters:

finalize - default `true` - finalizers are enabled

finalize

protected void finalize()
                 throws java.lang.Throwable

Overrides:

finalize in class java.lang.Object

Throws:

java.lang.Throwable

recommendedCOutSize

public static long recommendedCOutSize()

setChecksum

public ZstdOutputStream setChecksum(boolean useChecksums)
                             throws java.io.IOException

Enable checksums for the compressed stream. Default: false

Throws:

java.io.IOException

setLevel

public ZstdOutputStream setLevel(int level)
                          throws java.io.IOException

Set the compression level. Default: Zstd.defaultCompressionLevel()

Throws:

java.io.IOException

setLong

public ZstdOutputStream setLong(int windowLog)
                         throws java.io.IOException

Set the Long Distance Matching. Values for windowLog outside the range 10-27 will disable and reset LDM

Throws:

java.io.IOException

setWorkers

public ZstdOutputStream setWorkers(int n)
                            throws java.io.IOException

Enable use of worker threads for parallel compression. Default: no worker threads.

Throws:

java.io.IOException

setCloseFrameOnFlush

public ZstdOutputStream setCloseFrameOnFlush(boolean closeOnFlush)
                                      throws java.io.IOException

Enable closing the frame on flush. This will guarantee that it can be ready fully if the process crashes before closing the stream. On the downside it will negatively affect the compression ratio. Default: false.

Throws:

java.io.IOException

setDict

public ZstdOutputStream setDict(byte[] dict)
                         throws java.io.IOException

Throws:

java.io.IOException

setDict

public ZstdOutputStream setDict(ZstdDictCompress dict)
                         throws java.io.IOException

Throws:

java.io.IOException

write

public void write(byte[] src,
                  int offset,
                  int len)
           throws java.io.IOException

Overrides:

write in class java.io.FilterOutputStream

Throws:

java.io.IOException

write

public void write(int i)
           throws java.io.IOException

Overrides:

write in class java.io.FilterOutputStream

Throws:

java.io.IOException

flush

public void flush()
           throws java.io.IOException

Flushes the output

Specified by:

flush in interface java.io.Flushable

Overrides:

flush in class java.io.FilterOutputStream

Throws:

java.io.IOException

close

public void close()
           throws java.io.IOException

Specified by:

close in interface java.io.Closeable

Overrides:

close in class java.io.FilterOutputStream

Throws:

java.io.IOException