Class IBANCheckDigit

java.lang.Object

org.apache.commons.validator.routines.checkdigit.IBANCheckDigit

All Implemented Interfaces:

Serializable, CheckDigit

public final class IBANCheckDigit
extends Object
implements CheckDigit, Serializable

IBAN (International Bank Account Number) Check Digit calculation/validation.

This routine is based on the ISO 7064 Mod 97,10 check digit calculation routine.

The two check digit characters in a IBAN number are the third and fourth characters in the code. For check digit calculation/validation the first four characters are moved to the end of the code. So CCDDnnnnnnn becomes nnnnnnnCCDD (where CC is the country code and DD is the check digit). For check digit calculation the check digit value should be set to zero (i.e. CC00nnnnnnn in this example.

Note: the class does not check the format of the IBAN number, only the check digits.

For further information see Wikipedia - IBAN number.

Since:

Validator 1.4

Version:

$Revision: 1713572 $

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
static final CheckDigit	IBAN_CHECK_DIGIT	Singleton IBAN Number Check Digit instance
private static final long	MAX
private static final long	MODULUS
private static final long	serialVersionUID

Constructor Summary

Constructors

Constructor	Description
IBANCheckDigit()	Construct Check Digit routine for IBAN Numbers.

Method Summary

Modifier and Type	Method	Description
String	calculate(String code)	Calculate the Check Digit for an IBAN code.
private int	calculateModulus(String code)	Calculate the modulus for a code.
boolean	isValid(String code)	Validate the check digit of an IBAN code.

Methods inherited from class Object

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

Field Details

serialVersionUID

private static final long serialVersionUID

See Also:

• Constant Field Values

IBAN_CHECK_DIGIT

public static final CheckDigit IBAN_CHECK_DIGIT

Singleton IBAN Number Check Digit instance

MAX

private static final long MAX

See Also:

• Constant Field Values

MODULUS

private static final long MODULUS

See Also:

• Constant Field Values

Constructor Details

IBANCheckDigit

public IBANCheckDigit()

Construct Check Digit routine for IBAN Numbers.

Method Details

isValid

public boolean isValid(String code)

Validate the check digit of an IBAN code.

Specified by:

isValid in interface CheckDigit

Parameters:

code - The code to validate

Returns:

true if the check digit is valid, otherwise false

calculate

public String calculate(String code)
                 throws CheckDigitException

Calculate the Check Digit for an IBAN code.

Note: The check digit is the third and fourth characters and is set to the value "00".

Specified by:

calculate in interface CheckDigit

Parameters:

code - The code to calculate the Check Digit for

Returns:

The calculated Check Digit as 2 numeric decimal characters, e.g. "42"

Throws:

CheckDigitException - if an error occurs calculating the check digit for the specified code

calculateModulus

private int calculateModulus(String code)
                      throws CheckDigitException

Calculate the modulus for a code.

Parameters:

code - The code to calculate the modulus for.

Returns:

The modulus value

Throws:

CheckDigitException - if an error occurs calculating the modulus for the specified code