[cdi-dev] Getting injection point from Bean#create
Hi,
In a producer method it's trivial to get access to an InjectionPoint
instance representing the point where the value produced by the
producer will be injected.
When registering a Bean manually from an extension using
AfterBeanDiscovery#addBean, this is not immediately obvious.
After some fumbling with the CDI APIs I came up with the following
code that seems to work on both Weld and OWB (didn't test CanDI yet).
It uses a small "dummy" class, which is used to grab an InjectionPoint off:
In a Bean:
public Object create(CreationalContext<Object> creationalContext) {
InjectionPoint injectionPoint = (InjectionPoint)
beanManager.getInjectableReference(
resolve(beanManager,
InjectionPointGenerator.class).getInjectionPoints().iterator().next(),
creationalContext
);
With InjectionPointGenerator being the following class:
public class InjectionPointGenerator {
@Inject
private InjectionPoint injectionPoint;
}
And resolve being the following method:
public static <T> Bean<T> resolve(BeanManager beanManager, Class<T>
beanClass) {
Set<Bean<?>> beans = beanManager.getBeans(beanClass);
for (Bean<?> bean : beans) {
if (bean.getBeanClass() == beanClass) {
return (Bean<T>)
beanManager.resolve(Collections.<Bean<?>>singleton(bean));
}
}
return (Bean<T>) beanManager.resolve(beans);
}
As mentioned, while this seems to work, I wonder if it's the best approach.
Kind regards,
Arjan