Class EAN13CheckDigit

All Implemented Interfaces:
Serializable, CheckDigit

public final class EAN13CheckDigit extends ModulusCheckDigit
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:

See Also:
  • Field Details

  • Constructor Details

    • EAN13CheckDigit

      public EAN13CheckDigit()
      Constructs a modulus 10 Check Digit routine for EAN/UPC.
  • Method Details

    • weightedValue

      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.

      Specified by:
      weightedValue in class ModulusCheckDigit
      charValue - The numeric value of the character.
      leftPos - The position of the character in the code, counting from left to right
      rightPos - The positionof the character in the code, counting from right to left
      The weighted value of the character.