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java.lang.Objectorg.apache.commons.validator.routines.checkdigit.ModulusCheckDigit
org.apache.commons.validator.routines.checkdigit.EAN13CheckDigit
public final class EAN13CheckDigit
Modulus 10 EAN-13 / UPC / ISBN-13 Check Digit calculation/validation.
Check digit calculation is based on modulus 10 with digits in an odd position (from right to left) being weighted 1 and even position digits being weighted 3.
For further information see:
Field Summary | |
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static CheckDigit |
INSTANCE
Singleton EAN-13 Check Digit instance |
Constructor Summary | |
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EAN13CheckDigit()
Construct a modulus 10 Check Digit routine for EAN/UPC. |
Method Summary | |
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protected int |
weightedValue(int charValue,
int leftPos,
int rightPos)
Calculates the weighted value of a character 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 EAN13CheckDigit()
Method Detail |
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protected int weightedValue(int charValue, int leftPos, int rightPos)
Calculates the weighted value of a character in the code at a specified position.
For EAN-13 (from right to left) odd digits are weighted with a factor of one and even digits with a factor of three.
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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