Top Description Fields Constructors Methods

io.netty.handler.codec.compression

pack-priv final Class Bzip2MTFAndRLE2StageEncoder

Class Inheritance

extends Object

java.lang.Object
io.netty.handler.codec.compression.Bzip2MTFAndRLE2StageEncoder

Static Imports

io.netty.handler.codec.compression.Bzip2Constants.HUFFMAN_MAX_ALPHABET_SIZE, .Bzip2Constants.HUFFMAN_SYMBOL_RUNA, .Bzip2Constants.HUFFMAN_SYMBOL_RUNB

An encoder for the Bzip2 Move To Front Transform and Run-Length Encoding[2] stages.
Although conceptually these two stages are separate, it is computationally efficient to perform them in one pass.

Field Summary

Modifier and Type	Field and Description
private int	alphabetSize The encoded alphabet size.
private final int[]	bwtBlock The Burrows-Wheeler transformed block.
private final int	bwtLength Actual length of the data in the `bwtBlock` array.
private final boolean[]	bwtValuesPresent At each position, `true` if the byte value with that index is present within the block, otherwise `false`.
private final char[]	mtfBlock The output of the Move To Front Transform and Run-Length Encoding[2] stages.
private int	mtfLength The actual number of values contained in the `mtfBlock` array.
private final int[]	mtfSymbolFrequencies The global frequencies of values within the `mtfBlock` array.

Constructor Summary

Access	Constructor and Description
pack-priv	Bzip2MTFAndRLE2StageEncoder(final int[] The Burrows Wheeler Transformed block data bwtBlock, final int The actual length of the BWT data bwtLength, final boolean[] The values that are present within the BWT data. For each index, `true` if that value is present within the data, otherwise `false` bwtValuesPresent)

Method Summary

Modifier and Type	Method and Description
pack-priv void	encode() Performs the Move To Front transform and Run Length Encoding[1] stages.
pack-priv int	Returns: The size of the MTF block's alphabet mtfAlphabetSize()
pack-priv char[]	Returns: The encoded MTF block mtfBlock()
pack-priv int	Returns: The actual length of the MTF block mtfLength()
pack-priv int[]	Returns: The frequencies of the MTF block's symbols mtfSymbolFrequencies()

Inherited from java.lang.Object:: clone equals finalize getClass hashCode notify notifyAll toString wait wait wait

Field Detail

alphabetSize	back to summary
private int alphabetSize The encoded alphabet size.

bwtBlock	back to summary
private final int[] bwtBlock The Burrows-Wheeler transformed block.

bwtLength	back to summary
private final int bwtLength Actual length of the data in the `bwtBlock` array.

bwtValuesPresent	back to summary
private final boolean[] bwtValuesPresent At each position, `true` if the byte value with that index is present within the block, otherwise `false`.

mtfBlock	back to summary
private final char[] mtfBlock The output of the Move To Front Transform and Run-Length Encoding[2] stages.

mtfLength	back to summary
private int mtfLength The actual number of values contained in the `mtfBlock` array.

mtfSymbolFrequencies	back to summary
private final int[] mtfSymbolFrequencies The global frequencies of values within the `mtfBlock` array.

Constructor Detail

Bzip2MTFAndRLE2StageEncoder	back to summary
pack-priv Bzip2MTFAndRLE2StageEncoder(final int[] bwtBlock, final int bwtLength, final boolean[] bwtValuesPresent) Parameters bwtBlock:int[] The Burrows Wheeler Transformed block data bwtLength:int The actual length of the BWT data bwtValuesPresent:boolean[] The values that are present within the BWT data. For each index, `true` if that value is present within the data, otherwise `false`

Method Detail

encode	back to summary
pack-priv void encode() Performs the Move To Front transform and Run Length Encoding[1] stages.

mtfAlphabetSize	back to summary
pack-priv int mtfAlphabetSize() Returns:int The size of the MTF block's alphabet

mtfBlock	back to summary
pack-priv char[] mtfBlock() Returns:char[] The encoded MTF block

mtfLength	back to summary
pack-priv int mtfLength() Returns:int The actual length of the MTF block

mtfSymbolFrequencies	back to summary
pack-priv int[] mtfSymbolFrequencies() Returns:int[] The frequencies of the MTF block's symbols