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From Jens v.P. <>
Subject Re: Has anybody extended the validator framework?
Date Wed, 23 Jul 2003 14:54:32 GMT

Am Mittwoch, 23.07.03 um 16:24 Uhr schrieb Derek Chen-Becker:
> Since the questionnaire is the model for the form, couldn't you just 
> encapsulate a real questionnaire business object within an ActionForm? 
> It adds a layer, but since ActionForms are objects and not interfaces 
> I don't see an easier way than delegation.

I'm not sure I understand that. Do you mean to use the validator 
"outside" struts (in the business layer) and delegate all validations 
in the form to the business object? Like this:

MyForm extends ActionForm {
      public ActionErrors validate(..) {

That was my first idea, too. But in this case I don't know how to use 
client side validation (and that's a really nice feature). And it still 
doesn't solve the problem of dynamically created questionnaires/forms.

I'm thinking about a way to extend/modify the validator for supporting 
"runtime configuration". I hope that this is not too complicate - I 
guess that I only have to exchange the digester creation by a runtime 
configuration. Or by simply "extending" the digester for creating my 
own "business" classes, adding some features which I require, and add 
the ability to the business classes (or add a layer between with this 
ability) to generate the validator framework classes on the fly, based 
on the extended definition.


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