org.apache.cassandra.io.compress

Class LZ4Compressor

java.lang.Object

org.apache.cassandra.io.compress.LZ4Compressor

All Implemented Interfaces:

ICompressor

public class LZ4Compressor
extends java.lang.Object
implements ICompressor

Field Summary

Fields

Modifier and Type	Field and Description
static LZ4Compressor	instance

Method Summary

Modifier and Type	Method and Description
void	compress(java.nio.ByteBuffer input, java.nio.ByteBuffer output) Compression for ByteBuffers.
static LZ4Compressor	create(java.util.Map<java.lang.String,java.lang.String> args)
int	initialCompressedBufferLength(int chunkLength)
BufferType	preferredBufferType() Returns the preferred (most efficient) buffer type for this compressor.
java.util.Set<java.lang.String>	supportedOptions()
boolean	supports(BufferType bufferType) Checks if the given buffer would be supported by the compressor.
int	uncompress(byte[] input, int inputOffset, int inputLength, byte[] output, int outputOffset)
void	uncompress(java.nio.ByteBuffer input, java.nio.ByteBuffer output) Decompression for DirectByteBuffers.

Methods inherited from class java.lang.Object

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

Field Detail

instance

public static final LZ4Compressor instance

Method Detail

create

public static LZ4Compressor create(java.util.Map<java.lang.String,java.lang.String> args)

initialCompressedBufferLength

public int initialCompressedBufferLength(int chunkLength)

Specified by:

initialCompressedBufferLength in interface ICompressor

compress

public void compress(java.nio.ByteBuffer input,
                     java.nio.ByteBuffer output)
              throws java.io.IOException

Description copied from interface: ICompressor

Compression for ByteBuffers. The data between input.position() and input.limit() is compressed and placed into output starting from output.position(). Positions in both buffers are moved to reflect the bytes read and written. Limits are not changed.

Specified by:

compress in interface ICompressor

Throws:

java.io.IOException

uncompress

public int uncompress(byte[] input,
                      int inputOffset,
                      int inputLength,
                      byte[] output,
                      int outputOffset)
               throws java.io.IOException

Specified by:

uncompress in interface ICompressor

Throws:

java.io.IOException

uncompress

public void uncompress(java.nio.ByteBuffer input,
                       java.nio.ByteBuffer output)
                throws java.io.IOException

Description copied from interface: ICompressor

Decompression for DirectByteBuffers. The data between input.position() and input.limit() is uncompressed and placed into output starting from output.position(). Positions in both buffers are moved to reflect the bytes read and written. Limits are not changed.

Specified by:

uncompress in interface ICompressor

Throws:

java.io.IOException

supportedOptions

public java.util.Set<java.lang.String> supportedOptions()

Specified by:

supportedOptions in interface ICompressor

preferredBufferType

public BufferType preferredBufferType()

Description copied from interface: ICompressor

Returns the preferred (most efficient) buffer type for this compressor.

Specified by:

preferredBufferType in interface ICompressor

supports

public boolean supports(BufferType bufferType)

Description copied from interface: ICompressor

Checks if the given buffer would be supported by the compressor. If a type is supported the compressor must be able to use it in combination with all other supported types. Direct and memory-mapped buffers must be supported by all compressors.

Specified by:

supports in interface ICompressor