org.thc.shagg.algorithms
Class Modulus10AlgorithmLuhn
java.lang.Object
|
+--org.thc.shagg.algorithms.Modulus10Algorithm
|
+--org.thc.shagg.algorithms.Modulus10AlgorithmLuhn
- All Implemented Interfaces:
- CheckDigitAlgorithm
- Direct Known Subclasses:
- Modulus10AlgorithmCC
- public class Modulus10AlgorithmLuhn
- extends Modulus10Algorithm
This is "my" definition of the Luhn Algorithm. There are different
opinions whether the Luhn Algorithm based on the Modulus 10 Algorithm
works like the Basic or the Luhn Classes that have been implemented.
The Luhn Algorithm uses a different Addition. Instead of simply adding
two elements, the chain sum of the elements is added, e.g. 10+2 = 3 :)
- Version:
- $Id: Modulus10AlgorithmLuhn.java,v 1.6 2003/07/18 10:08:05 plasmoid Exp $
- Author:
- Plasmoid (plasmoid@thc.org),
THC
Method Summary |
int |
mod10Add(int[] sequence,
int[] weights,
int index)
Add method for the Modulus 10 Algorithm. |
int |
mod10checkDigit(int[] sequence)
Check method for the Modulus 10 Algorithm. |
Methods inherited from class java.lang.Object |
, clone, equals, finalize, getClass, hashCode, notify, notifyAll, registerNatives, toString, wait, wait, wait |
Modulus10AlgorithmLuhn
public Modulus10AlgorithmLuhn()
mod10Add
public int mod10Add(int[] sequence,
int[] weights,
int index)
- Add method for the Modulus 10 Algorithm. Elements are added by
calculating the chain sum of the multiplied element with the
given weights.
- Overrides:
mod10Add
in class Modulus10Algorithm
- Parameters:
sequence
- Integer sequence representing the digits to check,
not necessary between 0 and 9.weights
- Integer sequence of the weights to use, may be of
any length.index
- Current index- Returns:
- Sum at index.
mod10checkDigit
public int mod10checkDigit(int[] sequence)
- Check method for the Modulus 10 Algorithm. The last digit represents
the check digit.
- Overrides:
mod10checkDigit
in class Modulus10Algorithm
- Parameters:
sequence
- Integer sequence representing the digits to check,
not necessary between 0 and 9.- Returns:
- The check digit.