VerhoeffCheckDigit

java.lang.Object
- org.apache.commons.validator.routines.checkdigit.VerhoeffCheckDigit

All Implemented Interfaces:

java.io.Serializable, CheckDigit
```
public final class VerhoeffCheckDigit
extends java.lang.Object
implements java.io.Serializable
```
Verhoeff (Dihedral) Check Digit calculation/validation.
Check digit calculation for numeric codes using a Dihedral Group of order 10.
See Wikipedia - Verhoeff algorithm for more details.

Since:

1.4

See Also:

Serialized Form

Field Summary

Fields
Modifier and Type Field Description

static CheckDigit VERHOEFF_CHECK_DIGIT
Singleton Verhoeff Check Digit instance

Constructor Summary

Constructors
Constructor Description

VerhoeffCheckDigit()
Constructs a new instance.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`java.lang.String`	`calculate(java.lang.String code)`	Calculate a Verhoeff Check Digit for a code.
`boolean`	`isValid(java.lang.String code)`	Validate the Verhoeff Check Digit for a code.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - VERHOEFF_CHECK_DIGIT
```
public static final CheckDigit VERHOEFF_CHECK_DIGIT
```
    Singleton Verhoeff Check Digit instance
- Constructor Detail
  - VerhoeffCheckDigit
```
public VerhoeffCheckDigit()
```
    Constructs a new instance.
- Method Detail
  - calculate
```
public java.lang.String calculate(java.lang.String code)
                           throws CheckDigitException
```
    Calculate a Verhoeff Check Digit for a code.
    
    Specified by:
    
    calculate in interface CheckDigit
    
    Parameters:
    
    code - The code to calculate the Check Digit for
    
    Returns:
    
    The calculated Check Digit
    
    Throws:
    
    CheckDigitException - if an error occurs calculating the check digit for the specified code
  - isValid
```
public boolean isValid(java.lang.String code)
```
    Validate the Verhoeff Check Digit for a code.
    
    Specified by:
    
    isValid in interface CheckDigit
    
    Parameters:
    
    code - The code to validate
    
    Returns:
    
    true if the check digit is valid, otherwise false