LuhnCheck (Red Hat JBoss Enterprise Application Platform 8.0.0.GA public API)

```
@Documented
@Constraint(validatedBy={})
@Target({METHOD,FIELD,ANNOTATION_TYPE,CONSTRUCTOR,PARAMETER,TYPE_USE})
@Retention(RUNTIME)
@Repeatable(List.class)
public @interface LuhnCheck
```
Luhn algorithm check constraint.
Allows to validate that a series of digits pass the Luhn Modulo 10 checksum algorithm. The Luhn Mod10 is calculated by summing up the digits, with every odd digit (from right to left) value multiplied by 2, if the value is greater than 9 the the result digits a summed before the total summing.

The supported type is CharSequence. null is considered valid.

Author:

George Gastaldi, Hardy Ferentschik, Victor Rezende dos Santos

Optional Element Summary

Optional Elements
Modifier and Type	Optional Element	Description
`int`	`checkDigitIndex`
`int`	`endIndex`
`Class<?>[]`	`groups`
`boolean`	`ignoreNonDigitCharacters`
`String`	`message`
`Class<? extends Payload>[]`	`payload`
`int`	`startIndex`

- Element Detail
  - message
```
String message
```
    Default:
    
    "{org.hibernate.validator.constraints.LuhnCheck.message}"
- - groups
```
Class<?>[] groups
```
    Default:
    
    {}
- - payload
```
Class<? extends Payload>[] payload
```
    Default:
    
    {}
- - startIndex
```
int startIndex
```
    Returns:
    
    the start index (inclusive) for calculating the checksum. If not specified 0 is assumed.
    
    Default:
    
    0
- - endIndex
```
int endIndex
```
    Returns:
    
    the end index (inclusive) for calculating the checksum. If not specified the whole value is considered.
    
    Default:
    
    2147483647
- - checkDigitIndex
```
int checkDigitIndex
```
    Returns:
    
    The index of the check digit in the input. Per default it is assumed that the check digit is the last digit of the specified range. If set, the digit at the specified index is used. If set the following must hold true: checkDigitIndex > 0 && (checkDigitIndex < startIndex || checkDigitIndex >= endIndex.
    
    Default:
    
    -1
- - ignoreNonDigitCharacters
```
boolean ignoreNonDigitCharacters
```
    Returns:
    
    Whether non-digit characters in the validated input should be ignored (true) or result in a validation error (false).
    
    Default:
    
    true