[hibernate-dev] Re: [BV] Support for constraints by groups

[Hardy Ferentschik]

On Tue, 26 May 2009 16:57:11 +0200, Emmanuel Bernard  
<emmanuel at hibernate.org> wrote:

>> # background
>> When validating a specific group(s), Bean Validation expends the
>> group into a sequence of groups to be validated (because a group can
>> be a group sequence really). Depending on how clever the
>> implementation is, it could sequencialize all group execution or try
>> to validate several non sequenced group in parallel.

We are already doing the sequencialize part. In our case we are populating  
a 'GroupChain'
object, but the idea is the same. However, this sequencializing is really  
independent
 from the defined constraints. One can determine the group execution order  
without actually
evaluating the entities. I think group sequencialize and actual validation  
are orthogonal
and should stay this way.

I am also not sure why we should add  
validator.getConstraintsForClassAndGroups to the Validator
interface? The Validator interface is the main contract between Bean  
Validation and a client.
It allows to either validate an object or get some meta information. The  
latter is probably mainly
used for tooling. Where would validator.getConstraintsForClassAndGroups  
fit into this?
Why would we expose this call to a client?

--Hardy