7:19 a.m.
2018-03-31 13:42 GMT+02:00 Guillaume Smet <guillaume.smet(a)gmail.com>:
On Sat, Mar 31, 2018 at 11:51 AM, Gunnar Morling
<gunnar(a)hibernate.org>
wrote:
> That's an interesting one; it was originally worded exactly like Matt
> suggests, but then we changed into the current version:
> https://hibernate.atlassian.net/browse/BVAL-678.
>
> I'm sympathetic to the current behaviour of that TCK test and to
> adjusting the spec wording accordingly. Only you, Guillaume, didn't seem to
> like that alternative as per our discussion on June 26th, in the Hibernate
> Validator chat room. Perhaps you remember what made you dislike it back
> then?
>
Ah, yes, I remember now.
The paragraph is:
- If the constraint carries neither the Unwrapping.Unwrap nor the
Unwrapping.Skip payload:
- If there is exactly one maximally-specific type-compliant value
extractor and this extractor is marked with @UnwrapByDefault, this
extractor is applied;
- Otherwise, no value extractor is applied.
The initial wording "exactly one maximally-specific type-compliant value
extractor marked with @UnwrapByDefault" was not accurate because it was not
clear if we should determine the "maximally-specific type-compliant value
extractor" first and then check if it is @UnwrapByDefault. This is
important because, for a given type parameter, we want to get the maximally
specific value extractor first and then we want to check if it is marked
with @UnwrapByDefault. We don't want to get the maximally specific (value
extractor marked with @UnwrapByDefault).
We also miss a mention of the case when there are 2 maximally-specific
type-compliant value extractors marked with @UnwrapByDefault.
I think a wording more in line with our intentions would be:
- We determine the maximally-specific type-compliant value extractors.
- If there are no matching value extractors or none is marked with
@UnwrapByDefault, no value extractor is applied.
- If exactly one is marked with @UnwrapByDefault, this very
extractor is applied.
Ok so far.
- If more than one are marked with @UnwrapByDefault, a
ConstraintDeclarationException is raised.
I don't think we can or should do this, instead no extractor should be
applied
in this case. It'd contradict quite clearly the spec's wording
"Otherwise, no value extractor is applied." Also the idea was that
implicitly applied extractors should be applied implicitly if it's doable
unambiguously, but they shouldn't cause any sort of configuration exception
otherwise.
The original wording could be interpreted in the way above, but +1 for
making it more exhaustive. Can you log a BVAL issue for 2.1?
I would lean towards implementing it this way in the implementations
and
fix it for BV 2.1.
+1 apart from the case where there are multiple maximally-specific
type-compliant value extractors marked with @ UBD as discussed above.
--
Guillaume
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