/*
* #%L
* BroadleafCommerce Common Libraries
* %%
* Copyright (C) 2009 - 2013 Broadleaf Commerce
* %%
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* #L%
*/
package org.broadleafcommerce.common.util;
public class Mod43CheckDigitUtil {
private final static String CHARSET = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ-. $/+%";
public static boolean isValidCheckedValue(String value) {
boolean valid = false;
if (value != null && !"".equals(value)) {
String code = value.substring(0, value.length() - 1);
char checkDigit = value.substring(value.length() - 1).charAt(0);
try {
if (generateCheckDigit(code) == checkDigit) {
valid = true;
}
} catch (Exception e) {
e.printStackTrace();
}
}
return valid;
}
public static char generateCheckDigit(String data) {
// MOD 43 check digit - take the acsii value of each digit, sum them up, divide by 43. the remainder is the check digit (in ascii)
int sum = 0;
for (int i = 0; i < data.length(); ++i) {
sum += CHARSET.indexOf(data.charAt(i));
}
int remainder = sum % 43;
return CHARSET.charAt(remainder);
}
public static void main(String[] args) {
try {
System.out.println(generateCheckDigit("TEACH000012345"));
} catch (Exception e) {
e.printStackTrace();
}
System.out.println(isValidCheckedValue("TEACH000012345B"));
}
}