package ca.pfv.spmf.algorithms.associationrules.TopKRules_and_TNR;
/* This file is copyright (c) 2008-2012 Philippe Fournier-Viger
*
* This file is part of the SPMF DATA MINING SOFTWARE
* (http://www.philippe-fournier-viger.com/spmf).
*
* SPMF is free software: you can redistribute it and/or modify it under the
* terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any later
* version.
*
* SPMF is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
* A PARTICULAR PURPOSE. See the GNU General Public License for more details.
* You should have received a copy of the GNU General Public License along with
* SPMF. If not, see <http://www.gnu.org/licenses/>.
*/
import java.util.LinkedList;
import java.util.List;
/**
* This class represents a transaction
* optimized for the TNR and TopKRules algorithms for top-k
* association rule mining. In particular transactions
* are implemented as LinkedList for efficient removal of infrequent
* items as done by these algorithms.
*
* @see AlgoTNR
* @see AlgoTopKRules
* @see Database
* @author Philippe Fournier-Viger
*/
public class Transaction{
// a transaction is an ordered list of items
private final List<Integer> items;
/**
* Constructor
* @param size the size of the transaction
*/
public Transaction(int size){
// WE USE A LINKEDLIST BECAUSE WE PERFORM MANY DELETE OPERATIONS.
items = new LinkedList<Integer>();
}
/**
* Add an item to the transaction.
* @param item an item.
*/
public void addItem(Integer item){
items.add(item);
}
/**
* Get the list of items in this transaction
* @return a List of Integers
*/
public List<Integer> getItems() {
return items;
}
}