// Openbravo POS is a point of sales application designed for touch screens.
// Copyright (C) 2007-2009 Openbravo, S.L.
// http://www.openbravo.com/product/pos
//
// This file is part of Openbravo POS.
//
// Openbravo POS 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.
//
// Openbravo POS 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 Openbravo POS. If not, see <http://www.gnu.org/licenses/>.
package com.openbravo.pos.util;
/**
*
* @author Mikel Irurita
*/
public class LuhnAlgorithm {
/** Creates a new instance of LuhnAlgorithm */
private LuhnAlgorithm() {
}
public static boolean checkCC(String cardNumber){
int sum = 0;
if ( !StringUtils.isNumber(cardNumber) ){
return false;
}
for (int i = 0; i < cardNumber.length(); i++) {
int k = Integer.parseInt(cardNumber.substring(i, i+1));
if ( i % 2 == 0 ) {
k *= 2;
if (k > 9) {
k -= 9;
}
}
sum += k;
}
return (sum % 10 == 0);
}
}