org.apache.bval.extras.constraints.checkdigit
Class EAN13Validator

java.lang.Object
  extended by org.apache.bval.extras.constraints.checkdigit.ModulusValidator<EAN13>
      extended by org.apache.bval.extras.constraints.checkdigit.EAN13Validator
All Implemented Interfaces:
ConstraintValidator<EAN13,String>

public final class EAN13Validator
extends ModulusValidator<EAN13>

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:


Constructor Summary
EAN13Validator()
           
 
Method Summary
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.bval.extras.constraints.checkdigit.ModulusValidator
initialize, isValid, sumDigits, toInt
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

EAN13Validator

public EAN13Validator()
Method Detail

weightedValue

protected int weightedValue(int charValue,
                            int leftPos,
                            int rightPos)
                     throws Exception

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.

Calculates the weighted value of a character in the code at a specified position.

Some modulus routines weight the value of a character depending on its position in the code (e.g. ISBN-10), while others use different weighting factors for odd/even positions (e.g. EAN or Luhn). Implement the appropriate mechanism required by overriding this method.

Specified by:
weightedValue in class ModulusValidator<EAN13>
Parameters:
charValue - The numeric value of the character
leftPos - The position of the character in the code, counting from left to right
rightPos - The position of the character in the code, counting from right to left
Returns:
The weighted value of the character
Throws:
Exception


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