it.unimi.dsi.compression
Class Fast64CodeWordCoder

java.lang.Object
  it.unimi.dsi.compression.CodeWordCoder
      it.unimi.dsi.compression.Fast64CodeWordCoder

All Implemented Interfaces:

Coder, PrefixCoder, Serializable

public final class Fast64CodeWordCoder
extends CodeWordCoder

A fast coder based on a set of codewords of length at most 64.

See Also:

Serialized Form

Field Summary

Fields inherited from class it.unimi.dsi.compression.CodeWordCoder

codeWord

Constructor Summary

Fast64CodeWordCoder(BitVector[] codeWord, long[] longCodeWord)
Creates a new codeword-based coder using the given vector of codewords.

Method Summary

int	encode(int symbol, OutputBitStream obs) Encodes a symbol.

Methods inherited from class it.unimi.dsi.compression.CodeWordCoder

codeWords, encode, flush, flush

Methods inherited from class java.lang.Object

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

Constructor Detail

Fast64CodeWordCoder

public Fast64CodeWordCoder(BitVector[] codeWord,
                           long[] longCodeWord)

Creates a new codeword-based coder using the given vector of codewords. The coder will be able to encode symbols numbered from 0 to codeWord.length-1, included.

Parameters:

codeWord - a vector of codewords.

longCodeWord - the same codewords as those specified in codeWord, but as right-aligned longs written in left-to-right fashion.

Method Detail

encode

public int encode(int symbol,
                  OutputBitStream obs)
           throws IOException

Description copied from interface: Coder

Encodes a symbol.

Specified by:

encode in interface Coder

Overrides:

encode in class CodeWordCoder

Parameters:

symbol - a symbol.

obs - the output bit stream where the encoded symbol will be written.

Returns:

the number of bits written.

Throws:

IOException