Coder.hpp File Reference

This class assigns 0,1,... new values (codes) to the frequent items. More...

#include "common.hpp"
#include <vector>
#include <set>
#include "io/input/transaction_reader/brBufferedTransactionReader.hpp"
#include "io/codec/decoder/df/CacheDFDecoder.hpp"

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Classes
class	Coder< T_R, D >
class	Coder< T_R, D >::params_t
Enumerations
enum	CodeMode { ASC, DESC, NOCARE }

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Detailed Description

This class assigns 0,1,... new values (codes) to the frequent items.

Actually, this class can be regarded as a wrapper around a transaction reader, that changes the items of the read in transaction with new codes. Obviuosly, when an itemset is written out, the items must be decoded. Writting out a coded itemset, however, is not the duty of the Coder class but rather the duty of a decoder. After the Coder generated the new codes it calls the setCodeInverse function of the decoder.

Parameters:

	T_R	the transaction reader, it has to implement TransactionReader interface
	D	the decoder

Author:

Ferenc BODON

Date:

2005-04-29

Definition in file Coder.hpp.

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Enumeration Type Documentation

enum CodeMode

Enumerator: ASC  Ascending order according to supports. DESC  Descending order according to supports. NOCARE  Support values are not taken into consideration. Definition at line 30 of file Coder.hpp.

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