package ca.pfv.spmf.algorithms.frequentpatterns.two_phase;
/* This file is copyright (c) 2008-2013 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.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
/**
* This class represents a transaction database with utility values,
* as used by the Two-Phase algorithm for high
* utility itemset mining.
*
* @see AlgoTwoPhase
* @see TransactionTP
* @author Philippe Fournier-Viger
*/
public class UtilityTransactionDatabaseTP {
// this is the set of items in the database
private final Set<Integer> allItems = new HashSet<Integer>();
// this is the list of transactions in the database
private final List<TransactionTP> transactions = new ArrayList<TransactionTP>();
/**
* Load a transaction database from a file.
* @param path the path of the file
* @throws IOException exception if error while reading the file.
*/
public void loadFile(String path) throws IOException {
String thisLine;
BufferedReader myInput = null;
try {
FileInputStream fin = new FileInputStream(new File(path));
myInput = new BufferedReader(new InputStreamReader(fin));
// for each transaction (line) in the input file
while ((thisLine = myInput.readLine()) != null) {
// if the line is a comment, is empty or is a
// kind of metadata
if (thisLine.isEmpty() == true ||
thisLine.charAt(0) == '#' || thisLine.charAt(0) == '%'
|| thisLine.charAt(0) == '@') {
continue;
}
// process the transaction
processTransaction(thisLine.split(":"));
}
} catch (Exception e) {
// catch exceptions
e.printStackTrace();
}finally {
if(myInput != null){
// close the file
myInput.close();
}
}
}
/**
* Process a line (transaction) from the input file
* @param line a line
*/
private void processTransaction(String line[]){
// get the transaction utility
int transactionUtility = Integer.parseInt(line[1]);
String[] items = line[0].split(" ");
String[] utilities = line[2].split(" ");
// Create a list for storing items
List<ItemUtility> itemUtilityObjects = new ArrayList<ItemUtility>();
// for each item
for(int i=0; i< items.length; i++) {
itemUtilityObjects.add(new ItemUtility(
Integer.parseInt(items[i]),
Integer.parseInt(utilities[i])));
}
// add the transaction to the list of transactions
transactions.add(new TransactionTP(itemUtilityObjects, transactionUtility));
}
/**
* Print this database to System.out.
*/
public void printDatabase(){
System.out
.println("=================== Database ===================");
int count = 0;
// for each transaction
for(TransactionTP itemset : transactions){
// print the transaction
System.out.print("0" + count + ": ");
itemset.print();
System.out.println("");
count++;
}
}
/**
* Get the number of transactions.
* @return a int
*/
public int size(){
return transactions.size();
}
/**
* Get the list of transactions.
* @return the list of Transactions.
*/
public List<TransactionTP> getTransactions() {
return transactions;
}
/**
* Get the set of items in this database.
* @return a Set of Integers
*/
public Set<Integer> getAllItems() {
return allItems;
}
}