Add support for LocalDate as Path-/QueryParam

[ghost]

closes #5860

[geoand]

Thanks for this!

I just now (sorry about that...) realized that using such parameter converters causes a performance penalty, which in this case we can avoid - but it requires a deeper integration into Quarkus.
If you are up for a slightly bigger challenge, I can tell you what needs to be updated.

[ghost]

@geoand
If there is no hurry in getting this implemented you can give further instructions.

[geoand]

Sure, I'll try to write so pointers over the weekend

[geoand]

Here is what needs to be done at a high lever:

Add a similar check like is done at:

https://github.com/quarkusio/quarkus/blob/master/independent-projects/resteasy-reactive/common/processor/src/main/java/org/jboss/resteasy/reactive/common/processor/EndpointIndexer.java#L884

where you will check to see if the type is LocalDate.
If it is, you do pretty much the same thing as is done for PATH_SEGMENT, except that you need to implement a new org.jboss.resteasy.reactive.server.core.parameters.converters named LocalDataParamConverter. The implementation should be straightforward if you see what is done for in PathSegmentParamConverter.

That should be enough to get the LocalDate handling registered in RESTEasy Reactive registered without any performance penantly

[ghost]

@geoand
Thanks for the pointers! Locally, it is working now. Could you please review the code?

Do you have a good template for the unit tests? And where should the tests be placed?

I think it makes sense to test at least the following scenarios:

1. LocalDate is working out-of-the-box with ISO-8601 format as PathParam and QueryParam
2. If there exists a user-defined ParamConverter for LocalDate (e.g. for ISO_WEEK_DATE) this one wins

[geoand]

The code seems reasonable.

As for the test, just add an something in https://github.com/quarkusio/quarkus/tree/c3458c623b30656ba435cb5dfdeda039aa09e4ec/extensions/resteasy-reactive/quarkus-resteasy-reactive/deployment/src/test/java/io/quarkus/resteasy/reactive/server/test/simple

[geoand]

Also, when you are done, please squash the commits

[ghost]

@geoand
Added tests for LocalDate as PathParam and QueryParam. Also added a test-case with a custom ParamConverterProvider for LocalDate in week-year format.

Regarding Native:
The other tests do not seem to have tests for the native-image. This can be skipped for this feature?
At least I tested the changes locally with a native runnable (Linux) and everything worked fine.

Squashed the commits locally and force-pushed. Is this okay?

Anything left?

[geoand]

Looks great, thanks a lot!