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java.lang.Objectorg.apache.commons.validator.routines.checkdigit.ModulusCheckDigit
org.apache.commons.validator.routines.checkdigit.ISBN10CheckDigit
public final class ISBN10CheckDigit
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:
Field Summary | |
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static CheckDigit |
INSTANCE
Singleton ISBN-10 Check Digit instance |
Constructor Summary | |
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ISBN10CheckDigit()
Construct a modulus 11 Check Digit routine for ISBN-10. |
Method Summary | |
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protected 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 org.apache.commons.validator.routines.checkdigit.ModulusCheckDigit |
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calculate, calculateModulus, getModulus, isValid, sumDigits |
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 ISBN10CheckDigit()
Method Detail |
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protected int weightedValue(int charValue, int leftPos, int rightPos)
For ISBN-10 (from right to left) digits are weighted by their position.
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
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.
toInt
in class ModulusCheckDigit
character
- The character to convert.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
CheckDigitException
- if an error occurs.protected 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'.
toCheckDigit
in class ModulusCheckDigit
charValue
- The integer value of the character.
CheckDigitException
- if an error occurs.
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