Class ISBN10CheckDigit

  • All Implemented Interfaces:
    java.io.Serializable, CheckDigit

    public final class ISBN10CheckDigit
    extends ModulusCheckDigit
    Modulus 11 ISBN-10 Check Digit calculation/validation.

    ISBN-10 Numbers are a numeric code except for the last (check) digit which can have a value of "X".

    Check digit calculation is based on modulus 11 with digits being weighted based by their position, from right to left with the first digit being weighted 1, the second 2 and so on. If the check digit is calculated as "10" it is converted to "X".

    N.B. From 1st January 2007 the book industry will start to use a new 13 digit ISBN number (rather than this 10 digit ISBN number) which uses the EAN-13 / UPC (see EAN13CheckDigit) standard.

    For further information see:

    Since:
    Validator 1.4
    Version:
    $Revision: 1649191 $
    See Also:
    Serialized Form
    • Constructor Summary

      Constructors 
      Constructor Description
      ISBN10CheckDigit()
      Construct a modulus 11 Check Digit routine for ISBN-10.
    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      protected java.lang.String toCheckDigit​(int charValue)
      Convert an integer value to a character at a specified position.
      protected int toInt​(char character, int leftPos, int rightPos)
      Convert a character at a specified position to an integer value.
      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 java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
    • Field Detail

      • ISBN10_CHECK_DIGIT

        public static final CheckDigit ISBN10_CHECK_DIGIT
        Singleton ISBN-10 Check Digit instance
    • Constructor Detail

      • ISBN10CheckDigit

        public ISBN10CheckDigit()
        Construct a modulus 11 Check Digit routine for ISBN-10.
    • Method Detail

      • weightedValue

        protected int weightedValue​(int charValue,
                                    int leftPos,
                                    int rightPos)
        Calculates the weighted value of a charcter in the code at a specified position.

        For ISBN-10 (from right to left) digits are weighted by their position.

        Specified by:
        weightedValue in class ModulusCheckDigit
        Parameters:
        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
        Returns:
        The weighted value of the character.
      • toInt

        protected int toInt​(char character,
                            int leftPos,
                            int rightPos)
                     throws CheckDigitException

        Convert a character at a specified position to an integer value.

        Character 'X' check digit converted to 10.

        Overrides:
        toInt in class ModulusCheckDigit
        Parameters:
        character - The character to convert.
        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 integer value of the character.
        Throws:
        CheckDigitException - if an error occurs.
      • toCheckDigit

        protected java.lang.String toCheckDigit​(int charValue)
                                         throws CheckDigitException

        Convert an integer value to a character at a specified position.

        Value '10' for position 1 (check digit) converted to 'X'.

        Overrides:
        toCheckDigit in class ModulusCheckDigit
        Parameters:
        charValue - The integer value of the character.
        Returns:
        The converted character.
        Throws:
        CheckDigitException - if an error occurs.