Re: [Springframework-developer] Declarative Validation Framework in Spring's Future?

[Michael E. M. <mm...@re...>]

Is Valang abstracted from MVC and http requests?
I need a validator that I can plug into my POJOs, which are app server 
classes,
NOT web server classes.

Matt Raible wrote:

> Hey guys,
>
> I have the following section in one of my Spring Live chapters. I 
> haven't seen much activity on the "declarative validation" front in 
> Spring MVC - so I want to make sure this is still valid.
>
> Thanks,
>
> Matt
>
> *Spring=92s Future Declarative Validation Framework
> *At the time of this writing, Commons Validator is the only 
> declarative validation framework that's been released to support 
> Spring MVC. There is another declarative validator (the _Valang 
> Validator_) that's part of the Spring Modules project, but it hasn't 
> been released yet. As far as declarative validation being part of 
> Spring - there are plans for it, but it hasn't been developed yet. I 
> asked Keith Donald to provide me with a few details about it, and here=
 
> are the key features/differentiators he sent me:
> =95 A simple, consistent interface for defining new validation rules 
> (rule providers simply implement a single "boolean test(argument)" 
> method).
> =95 Support for bean property expressions (for example, minProperty mu=
st 
> be less than maxProperty). The property access strategy will be 
> pluggable and not limited to java beans (for example, allowing 
> map-backed storage, or buffered "form objects" on the rich client side=
 
> of the house).
> =95 Support for complex nested expressions (and/or/not), and all 
> relational operators (>, >=3D, <, <=3D, !=3D, =3D=3D).
> =95 Support for applying different sets of rules based on context or 
> use-case.
> =95 A reporting subsystem capable of iterating over rule structures, 
> performing validation, and capturing/generating error message results.=
 
> This allows you to assemble complex rules on-the-fly without having to=
 
> hard code a lot of static messages; the reporter is capable of 
> generating rule messages from the underlying structures automatically.
> =95 Report field typing hints (the rules associated with a field to le=
t 
> the user know what they're expected to type).
> =95 Integration with Spring Rich Client Platform (RCP) and Spring MVC 
> environments.