Package org.apache.commons.validator.routines.checkdigit

Class ECNumberCheckDigit

java.lang.Object

org.apache.commons.validator.routines.checkdigit.ModulusCheckDigit

org.apache.commons.validator.routines.checkdigit.ECNumberCheckDigit

All Implemented Interfaces:

Serializable, CheckDigit

public final class ECNumberCheckDigit
extends ModulusCheckDigit

Modulus 11 EC number Check Digit calculation/validation.

The European Community number (EC number) is a unique seven-digit identifier that is assigned to chemical substances. For example, the EC number of arsenic is 231-148-6:

Check digit calculation is based on modulus 11 with digits being weighted based on their position (from left to right).

For further information see Wikipedia - EC number.

Since:

1.9.0

See Also:

• Serialized Form

Method Summary

Modifier and Type	Method	Description
String	calculate(String code)	Calculate a modulus Check Digit for a code which does not yet have one.
static CheckDigit	getInstance()	Gets the singleton instance of this validator.
boolean	isValid(String code)	Validate a modulus check digit for a code.
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

calculateModulus, getModulus, sumDigits, toCheckDigit, toInt

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Details

getInstance

public static CheckDigit getInstance()

Gets the singleton instance of this validator.

Returns:

A singleton instance of the EC Number validator.

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 EC number digits are weighted by their position from left to right.

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.

calculate

public String calculate(String code)
                 throws CheckDigitException

Calculate a modulus Check Digit for a code which does not yet have one.

Specified by:

calculate in interface CheckDigit

Overrides:

calculate in class ModulusCheckDigit

Parameters:

code - The code for which to calculate the Check Digit; the check digit should not be included

Returns:

The calculated Check Digit

Throws:

CheckDigitException - if an error occurs calculating the check digit

isValid

public boolean isValid(String code)

Validate a modulus check digit for a code.

Specified by:

isValid in interface CheckDigit

Overrides:

isValid in class ModulusCheckDigit

Parameters:

code - The code to validate

Returns:

true if the check digit is valid, otherwise false