Validations with dynamical values

yaswanthbs · **Joined:** Mon Apr 08, 2013 1:56 pm **Posts:** 1

Hi all,

Presently we are using JSR303 for validations in my project.
The sample code is like this.
Ex:
@Range(min = 1, max = 150)
int age;

If I want to get the min value and max value from database.

Actually I am getting the values and having in some object. But don't know how to pass that values for min and max.

Regards,
Sai.

Gunnar · **Joined:** Sat Jan 24, 2009 12:46 pm **Posts:** 388

Java doesn't allow to set annotation attributes dynamically. Instead you could use the HV programmatic constraint API for declaring the constraint and determine its values dynamically like this:

Code:

HibernateValidatorConfiguration configuration = Validation.byProvider(HibernateValidator.class).configure();

int min = getMinValue();
int max = getMaxValue();

ConstraintMapping mapping = configuration.createConstraintMapping();
mapping.type(MyBean.class)
    .property("age", FIELD)
        .constraint(
            new RangeDef()
                .min(min)
                .max(max)
        );

configuration.addMapping(mapping); 
ValidatorFactory factory = configuration.buildValidatorFactory();
Validator validator = factory.getValidator();

You can learn more in the HV reference guide (http://docs.jboss.org/hibernate/stable/validator/reference/en-US/html_single/#programmaticapi).

--Gunnar