[bv-dev] Dependency between constraints and validators

[Gerhard Petracek]

hi gunnar,

we had a similar discussion for bv v1.
i suggested to allow e.g. a convention and/or to provide an api to map the
constraint validators to a constraint (such features are available e.g. in
myfaces extval).

+1 for re-visiting this topic.

regards,
gerhard



2011/10/23 Gunnar Morling <gunnar.morling at googlemail.com>

> Hello experts,
>
> one thing about BV I'm somewhat uncomfortable with is the (cyclic)
> dependency between constraint annotation types and their validators.
> This is, validators are referenced from constraints within the
> @Constraint meta-annotation, while constraint types are referenced by
> the type parameter in validator impl's.
>
> In particular this makes it impossible to clearly distinguish between
> the public API of a constraint library (the annotation types) and its
> implementation (the validators), e.g. by creating two distinct JARs.
>
> Therefore I'd personally prefer if there was only a reference from the
> validators to the constraints, but not the other way around. This of
> course raises the question how it would be determined which validators
> exist for a given constraint. One could think of using XML descriptors
> or some scanning-based approach. I guess from a technical POV this
> problem is somewhat related to what's to be done in CDI (finding bean
> implementations, processing qualifier annotations etc.).
>
> That said, I'd be very interested in your opinion on this topic. Do
> you think this is something we should address or do you think this
> sort of cycle is acceptable?
>
> Thanks,
>
> --Gunnar
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