[hibernate-dev] HV - Follow-Up: meta data API for method constraints

[Gunnar Morling]

Hi guys,

I just created the pull request for HV-371:
https://github.com/hibernate/hibernate-validator/pull/35

Just one note on MethodDescriptor: getParameterTypes() was not even
necessary, as this information can be retrieved using
getParameterDescriptors().

This all was way more work than I had expected, but after all I think this
looks quite ok. In case you have any ideas for improvement, just let me
know. Otherwise I think we are ready for Beta2.

Gunnar

PS: Emmanuel, thanks for featuring Kevin's and my nomination for the
community awards on in.relation.to. Now we just need some more votes :)


2011/3/1 Gunnar Morling <gunnar.morling at googlemail.com>

> Alright, I'll change this then as proposed.
>
> 2011/3/1 Emmanuel Bernard <emmanuel at hibernate.org>
>
> Looks fine to me. I was concerned about passing Method around as well.
>>
>> On 1 mars 2011, at 00:29, Gunnar Morling wrote:
>>
>> Hi,
>>
>> I pretty much finished the implementation of the meta data API related to
>> method level constraints for Hibernate Validator (see
>> https://github.com/gunnarmorling/hibernate-validator/commits/HV-371). The
>> implementation conforms with what we currently discussed, but right now I'm
>> wondering whether exposing java.lang.reflect.Method on the API is actually a
>> good idea. I see two issues:
>>
>> * Retrieving method objects via the reflection APIs is somewhat nasty, in
>> particular it requires to handle a checked NoSuchMethodException:
>>
>> try {
>>     Method bar = Foo.class.getDeclaredMethod( "bar", String.class );
>> }
>> catch(Exception e) {
>>     throw new RuntimeException(e);
>> }
>>
>> * The handling in inheritance hierarchies with overridden/implemented
>> methods can be confusing to users not overly familiar with the reflection
>> API. In particular there are different method objects for a base method and
>> its implementation/overriding methods. This can be irritating when invoking
>> MethodDescriptor#getMethod() for instance.
>>
>> Therefore I would be interested in feedback on the following change:
>>
>> public interface TypeDescriptor extends ElementDescriptor {
>>
>>     MethodDescriptor getConstraintsForMethod(String name, Class<?>...
>> parameterTypes);
>>     //instead of MethodDescriptor getConstraintsForMethod(Method method);
>>     ...
>> }
>>
>> public interface MethodDescriptor extends ElementDescriptor {
>>
>>     String getName();
>>
>>     List<Class<?>> parameterTypes();
>>     //instead of Method getMethod()
>>     ...
>> }
>>
>> WDYT?
>>
>> Thanks, Gunnar
>>
>>
>>
>