public final class LuhnCheckDigit extends ModulusCheckDigit
See Wikipedia for more details.
| Modifier and Type | Field and Description |
|---|---|
static CheckDigit |
LUHN_CHECK_DIGIT
Singleton Luhn Check Digit instance
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| Constructor and Description |
|---|
LuhnCheckDigit()
Construct a modulus 10 Luhn Check Digit routine.
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| Modifier and Type | Method and Description |
|---|---|
protected int |
weightedValue(int charValue,
int leftPos,
int rightPos)
Calculates the weighted value of a charcter in the
code at a specified position.
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calculate, calculateModulus, getModulus, isValid, sumDigits, toCheckDigit, toIntpublic 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 ModulusCheckDigitcharValue - The numeric value of the character.leftPos - The position of the character in the code, counting from left to rightrightPos - The position of the character in the code, counting from right to leftCopyright © 2002–2020 The Apache Software Foundation. All rights reserved.