java.io.Serializable
, CheckDigit
public final class LuhnCheckDigit extends ModulusCheckDigit
See Wikipedia for more details.
Modifier and Type | Field | Description |
---|---|---|
static CheckDigit |
LUHN_CHECK_DIGIT |
Singleton Luhn Check Digit instance
|
Constructor | Description |
---|---|
LuhnCheckDigit() |
Construct a modulus 10 Luhn Check Digit routine.
|
Modifier and Type | Method | Description |
---|---|---|
protected int |
weightedValue(int charValue,
int leftPos,
int rightPos) |
Calculates the weighted value of a charcter in the
code at a specified position.
|
calculate, calculateModulus, getModulus, isValid, sumDigits, toCheckDigit, toInt
public static final CheckDigit LUHN_CHECK_DIGIT
public LuhnCheckDigit()
protected int weightedValue(int charValue, int leftPos, int rightPos)
Calculates the weighted value of a charcter in the code at a specified position.
For Luhn (from right to left) odd digits are weighted with a factor of one and even digits with a factor of two. Weighted values > 9, have 9 subtracted
weightedValue
in class ModulusCheckDigit
charValue
- The numeric value of the character.leftPos
- The position of the character in the code, counting from left to rightrightPos
- The positionof the character in the code, counting from right to leftCopyright © 2002–2018. All rights reserved.