org.apache.cassandra.io.compress
Class CompressionMetadata

java.lang.Object
  org.apache.cassandra.io.compress.CompressionMetadata

public class CompressionMetadata
extends java.lang.Object

Holds metadata about compressed file

Nested Class Summary

class	CompressionMetadata.Chunk Holds offset and length of the file chunk
static class	CompressionMetadata.Writer

Field Summary

long	compressedFileLength
long	dataLength
java.lang.String	indexFilePath
CompressionParameters	parameters

Method Summary

CompressionMetadata.Chunk	chunkFor(long position) Get a chunk of compressed data (offset, length) corresponding to given position
int	chunkLength()
ICompressor	compressor()
static CompressionMetadata	create(java.lang.String dataFilePath) Create metadata about given compressed file including uncompressed data length, chunk size and list of the chunk offsets of the compressed data.

Methods inherited from class java.lang.Object

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

Field Detail

dataLength

public final long dataLength

compressedFileLength

public final long compressedFileLength

indexFilePath

public final java.lang.String indexFilePath

parameters

public final CompressionParameters parameters

Method Detail

create

public static CompressionMetadata create(java.lang.String dataFilePath)

Create metadata about given compressed file including uncompressed data length, chunk size and list of the chunk offsets of the compressed data. This is an expensive operation! Don't create more than one for each sstable.

Parameters:

dataFilePath - Path to the compressed file

Returns:

metadata about given compressed file.

compressor

public ICompressor compressor()

chunkLength

public int chunkLength()

chunkFor

public CompressionMetadata.Chunk chunkFor(long position)
                                   throws java.io.IOException

Get a chunk of compressed data (offset, length) corresponding to given position

Parameters:

position - Position in the file.

Returns:

pair of chunk offset and length.

Throws:

java.io.IOException - on any I/O error.