[cdi-dev] Proposal: Improve producer method signature capability by accepting qualifier annotations

[Pete Muir]

HI Mark,

Thanks for the suggestion. Can you file a JIRA (http://issues.jboss.org/browse/CDI) so we don’t loose this?

Pete

On 1 Aug 2014, at 19:16, Mark Paluch <mpaluch at paluch.biz> wrote:

> CDI supports producer methods which accept the InjectionPoint as argument which allows to access all metadata to the injection point. The InjectionPoint approach adds a certain complexity which is not needed when only qualifier metadata has to be processed. I propose to allow annotation types within the producer method signatures. Code example for a use case: 
> 
> {code}
> @HttpParam("username") @Inject String username
> {code}
> 
> {code}
> import javax.enterprise.inject.Produces;
> import javax.enterprise.inject.spi.InjectionPoint;
> 
> class HttpParams
>    @Produces
> 
>    String getParamValue(HttpParam httpParam) {
> 
>       ServletRequest request = (ServletRequest) FacesContext.getCurrentInstance().getExternalContext().getRequest();
> 	  
>       return request.getParameter(httpParam.value());
> 	  
>       // current support looks like:
>       // String getParamValue(InjectionPoint ip) {
>       // return request.getParameter(ip.getAnnotated().getAnnotation(HttpParam.class).value());
> 
>    }
> }
> {code}
> 
> Producer methods accepting qualifier annotations ensure to have always an annotation instance, this helps to prevent null pointer access since InjectionPoint.getAnnotated().getAnnotation(java.lang.Class<T>) may return null.
> 
> Best regards, Mark
> 
> --
> 
> PALUCH.biz
> Heckenpfad 14 // 69469 Weinheim
> T. 0 62 01/65 04 24-0 // F. 0 62 01/65 04 24-9
> mpaluch at paluch.biz
> http://www.paluch.biz
> 
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