Expand @Target to method and constructor arguments

[kozlovda]

Hi Jakob,

Nice set of handy validators, thanks! (and shame on http://beanvalidation.org to not support them out of the box though).

But I'm curious if it's possible to extend annotations' target to method params and constructor arguments as well?

E.g. for @Size annotation:

• original annotation:

@Target({ METHOD, FIELD, ANNOTATION_TYPE, CONSTRUCTOR, PARAMETER })
@Retention(RUNTIME)
@Documented
@Constraint(validatedBy = { })
public @interface Size {

• each-annotation:

@Documented
@Retention(RUNTIME)
@Target({METHOD, FIELD, ANNOTATION_TYPE})
@EachConstraint(validateAs = Size.class)
@Constraint(validatedBy = CommonEachValidator.class)
public @interface EachSize {

Having taken a quick look through the code I'd guess it should be as easy as to add those two target enum values.

Otherwise it appears to be pretty useless in a typical situation when you need to annotate multi-value query param in JAX-RS resource method definition, like this:

@Path("/")
public interface MyResource {

   @Path("/by-tags")
   List<MyDto> searchByTags(@QueryParam("tag") @EachSize(min = 2, max = 127) Set<String> tags);

}

[fgaule]

+1

[Blackbaud-RyanMcKay]

I would like this too, is there any argument with this suggestion, or does somebody just need to send a PR?

[oburgosm]

+1