Re: How to validate TextBox fields?

On Mon, Jan 7, 2013 at 7:42 AM, Thomas Broyer <t.broyer@gmail.com> wrote:

On Monday, January 7, 2013 3:45:53 PM UTC+1, membersound wrote:

Yes I know this side. But it still does not tell me:
- how to validate the name before creating the person object (which I'm looking for in terms of numbers like int age; There I'd first like the validator to catch if it's a valid age before creating the person object)

If you want to use the annotations that are on your Person fields, then you have to create a Person object.

Technically, I believe you could generate code, the generator reading the annotations and producing code that will be able to validate data before creating the Person object, but there's no such things in GWT proper.

That being said, creating a Person object shouldn't be that expensive that you want to avoid it a all costs.

http://docs.oracle.com/javaee/6/api/javax/validation/Validator.html#validateValue(java.lang.Class, java.lang.String, java.lang.Object, java.lang.Class...)

validateValue

<T> java.util.Set<ConstraintViolation<T>> validateValue(java.lang.Class<T> beanType,                                                          java.lang.String propertyName,                                                          java.lang.Object value,                                                          java.lang.Class<?>... groups)

Validates all constraints placed on the property named propertyName of the class beanType would the property value be value

ConstraintViolation objects return null for ConstraintViolation#getRootBean() and ConstraintViolation#getLeafBean()

Parameters:

beanType - the bean type

propertyName - property to validate

value - property value to validate

groups - group or list of groups targeted for validation (default to Default)

Returns:

constraint violations or an empty Set if none

Throws:

IllegalArgumentException - if beanType is null, if propertyName null, empty or not a valid object property or if null is passed to the varargs groups

ValidationException - if a non recoverable error happens during the validation process

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--

Nick Chalko | Software Engineer | nchalko@google.com |   :-) 

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