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.