org.apache.commons.compress.compressors.lz4

Class FramedLZ4CompressorOutputStream.Parameters

java.lang.Object

org.apache.commons.compress.compressors.lz4.FramedLZ4CompressorOutputStream.Parameters

Enclosing class:

FramedLZ4CompressorOutputStream

public static class FramedLZ4CompressorOutputStream.Parameters
extends java.lang.Object

Parameters of the LZ4 frame format.

Field Summary

Fields

Modifier and Type	Field and Description
static FramedLZ4CompressorOutputStream.Parameters	DEFAULT The default parameters of 4M block size, enabled content checksum, disabled block checksums and independent blocks.

Constructor Summary

Constructors

Constructor and Description
Parameters(FramedLZ4CompressorOutputStream.BlockSize blockSize) Sets up custom a custom block size for the LZ4 stream but otherwise uses the defaults of enabled content checksum, disabled block checksums and independent blocks.
Parameters(FramedLZ4CompressorOutputStream.BlockSize blockSize, boolean withContentChecksum, boolean withBlockChecksum, boolean withBlockDependency) Sets up custom parameters for the LZ4 stream.
Parameters(FramedLZ4CompressorOutputStream.BlockSize blockSize, boolean withContentChecksum, boolean withBlockChecksum, boolean withBlockDependency, Parameters lz77params) Sets up custom parameters for the LZ4 stream.
Parameters(FramedLZ4CompressorOutputStream.BlockSize blockSize, Parameters lz77params) Sets up custom a custom block size for the LZ4 stream but otherwise uses the defaults of enabled content checksum, disabled block checksums and independent blocks.

Method Summary

Modifier and Type	Method and Description
java.lang.String	toString()

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

DEFAULT

public static final FramedLZ4CompressorOutputStream.Parameters DEFAULT

The default parameters of 4M block size, enabled content checksum, disabled block checksums and independent blocks.

This matches the defaults of the lz4 command line utility.

Constructor Detail

Parameters

public Parameters(FramedLZ4CompressorOutputStream.BlockSize blockSize)

Sets up custom a custom block size for the LZ4 stream but otherwise uses the defaults of enabled content checksum, disabled block checksums and independent blocks.

Parameters:

blockSize - the size of a single block.

Parameters

public Parameters(FramedLZ4CompressorOutputStream.BlockSize blockSize,
                  Parameters lz77params)

Sets up custom a custom block size for the LZ4 stream but otherwise uses the defaults of enabled content checksum, disabled block checksums and independent blocks.

Parameters:

blockSize - the size of a single block.

lz77params - parameters used to fine-tune compression, in particular to balance compression ratio vs compression speed.

Parameters

public Parameters(FramedLZ4CompressorOutputStream.BlockSize blockSize,
                  boolean withContentChecksum,
                  boolean withBlockChecksum,
                  boolean withBlockDependency)

Sets up custom parameters for the LZ4 stream.

Parameters:

blockSize - the size of a single block.

withContentChecksum - whether to write a content checksum

withBlockChecksum - whether to write a block checksum. Note that block checksums are not supported by the lz4 command line utility

withBlockDependency - whether a block may depend on the content of a previous block. Enabling this may improve compression ratio but makes it impossible to decompress the output in parallel.

Parameters

public Parameters(FramedLZ4CompressorOutputStream.BlockSize blockSize,
                  boolean withContentChecksum,
                  boolean withBlockChecksum,
                  boolean withBlockDependency,
                  Parameters lz77params)

Sets up custom parameters for the LZ4 stream.

Parameters:

blockSize - the size of a single block.

withContentChecksum - whether to write a content checksum

withBlockChecksum - whether to write a block checksum. Note that block checksums are not supported by the lz4 command line utility

withBlockDependency - whether a block may depend on the content of a previous block. Enabling this may improve compression ratio but makes it impossible to decompress the output in parallel.

lz77params - parameters used to fine-tune compression, in particular to balance compression ratio vs compression speed.

Method Detail

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object