On Wed, 1 May 2002, Stefan Arentz wrote:
> Date: Wed, 1 May 2002 20:55:20 +0200
> From: Stefan Arentz <[EMAIL PROTECTED]>
> Reply-To: Struts Users Mailing List <[EMAIL PROTECTED]>
> To: Struts Users Mailing List <[EMAIL PROTECTED]>
> Subject: Re: Help required on Digester class
>
>
> On Wednesday, May 1, 2002, at 08:23 PM, Craig R. McClanahan wrote:
>
> ...
>
> >> Yup. This works fine. Digester is a great tool! One thing I'm looking
> >> at
> >> is how to combine it with a set of regular expression rules for the
> >> elements and attributes. Something like:
> >>
> >> <command id="123">
> >> <user username="stefan"/>
> >> </command>
> >>
> >> With a property list:
> >>
> >> command.id=/^\d+$/
> >> user.username=/^[a-z0-9]+$/
> >>
> >> And make this part of the validation process. I'm interested in your
> >> thoughts about this. Is this something to add to the Digester core code
> >> or something that I should move to my own classes?
> >>
> >
> > Do you mean that you want to ensure that the attributes match those
> > patterns? Personally, I think that's a little out of scope for
> > Digester,
> > although you could probably do it by implementing your own matching
> > algorithm in an org.apache.commons.digester.Rules implementation (either
> > don't select the rules on mismatched patterns, or throw an exception or
> > something). Another alternative would be to throw an exception in the
> > property setter of the beans being created.
>
> Hmm. I had not thought about the property setter. My problem is that I
> need to give feedback to the user about where exactly in the XML
> document the wrong input was given. Preferably with a line number. Is
> there a way to get that information from the parser, or is all that
> logic buried deep in the Digester class?
>
You could do this by firing a SAXException that will get rippled up.
You'd probably also need to provide your own ErrorHandler interface so
that such errors were not fatal to the parsing (if they were, you'd only
detect the first one).
> Stefan
>
Craig
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