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java.lang.Objectorg.apache.commons.validator.routines.checkdigit.ModulusCheckDigit
org.apache.commons.validator.routines.checkdigit.LuhnCheckDigit
public final class LuhnCheckDigit
Modulus 10 Luhn Check Digit calculation/validation.
Luhn check digits are used, for example, by:
See Wikipedia for more details.
Field Summary | |
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static CheckDigit |
INSTANCE
Singleton Luhn Check Digit instance |
Constructor Summary | |
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LuhnCheckDigit()
Construct a modulus 10 Luhn Check Digit routine. |
Method Summary | |
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protected int |
weightedValue(int charValue,
int leftPos,
int rightPos)
Calculates the weighted value of a charcter in the code at a specified position. |
Methods inherited from class org.apache.commons.validator.routines.checkdigit.ModulusCheckDigit |
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calculate, calculateModulus, getModulus, isValid, sumDigits, toCheckDigit, toInt |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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public static final CheckDigit INSTANCE
Constructor Detail |
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public LuhnCheckDigit()
Method Detail |
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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 left
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