ca.pfv.spmf.algorithms.associationrules.TopKRules_and_TNR

Class Database

java.lang.Object

ca.pfv.spmf.algorithms.associationrules.TopKRules_and_TNR.Database

public class Database
extends java.lang.Object

This class represents a transaction database optimized for the TNR and TopKRules algorithms for top-k association rule mining.

It contains a list of transaction implemented as linked-lists and keep track of the largest item ids and the total number of transactions in the database.

The main method is loadFile() for reading a file. But transactions can also be added manually by calling the method addTransaction.

See Also:

AlgoTNR, AlgoTopKRules, Transaction

Field Summary

Fields

Modifier and Type	Field and Description
int	maxItem the largest item in the database
int	tidsCount the number of transactions in the database

Constructor Summary

Constructors

Constructor and Description
Database()

Method Summary

Modifier and Type	Method and Description
void	addTransaction(java.lang.String[] itemsString) Read a transaction from the file and store it into memory
java.util.List<Transaction>	getTransactions() Get the list of transactions in this database.
void	loadFile(java.lang.String path) Load a file from a file path.
int	size() Get the number of transactions.

Methods inherited from class java.lang.Object

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

Field Detail

maxItem

public int maxItem

the largest item in the database

tidsCount

public int tidsCount

the number of transactions in the database

Constructor Detail

Database

public Database()

Method Detail

loadFile

public void loadFile(java.lang.String path)
              throws java.io.IOException

Load a file from a file path.

Parameters:

path - the input file path

Throws:

java.io.IOException - exception if an error while writing the file

addTransaction

public void addTransaction(java.lang.String[] itemsString)

Read a transaction from the file and store it into memory

Parameters:

itemsString - an array of items, where an item is an integer represented as a String.

size

public int size()

Get the number of transactions.

Returns:

the number of transactions

getTransactions

public java.util.List<Transaction> getTransactions()

Get the list of transactions in this database.

Returns:

a List of Transactions