Gtin (MT Bean Validators 1.8.8 API)

```
@Documented
@Constraint(validatedBy=GtinValidator.class)
@Target({METHOD,FIELD,ANNOTATION_TYPE,CONSTRUCTOR,PARAMETER})
@Retention(RUNTIME)
@AlternateSize(size1=8,
               size2=13)
@Digits(integer=13,
        fraction=0)
public @interface Gtin
```
The annotated element must be a valid Global Trade Item Number (until 2009 known as European Article Number) in the long (13 digits) or short (8 digits) format.
Supported types are Strings, other Objects are transfered to Strings, null elements are considered valid.
There are numeric, size and checksum tests by apache commons validation routines.

Author:

Manfred Tremmel

Optional Element Summary

Optional Elements
Modifier and Type	Optional Element	Description
`Class<?>[]`	`groups`	groups to use.
`String`	`message`	localized message.
`Class<? extends javax.validation.Payload>[]`	`payload`	payload whatever.

- Element Detail
  - message
```
String message
```
    localized message.
    
    Returns:
    
    localized validation message
    
    Default:
    
    "{de.knightsoftnet.validators.shared.Gtin.message}"
- - groups
```
Class<?>[] groups
```
    groups to use.
    
    Returns:
    
    array of validation groups
    
    Default:
    
    {}
- - payload
```
Class<? extends javax.validation.Payload>[] payload
```
    payload whatever.
    
    Returns:
    
    payload class
    
    Default:
    
    {}