Can I define Bijection in code (instead of annotations)?

[gbo3006]

Hi,

Trying to clean up my code, I'm struggling with generalizing the use of annotations (mainly @out), i.e. trying to move some of the injection/bijection annotations (currently repeatedly defined in my concrete classes) to a base class (using some proprietary naming convention):
1. can I define outjection - e.g. define a property as @out - using API, i.e. in code instead of using annotations?
2. can I use EL in @out annotation, and if so - does EL support any notion of 'this' might allow me to refer to the current class/object?

Thanks
Gilad

[sherkan777]

Yes u can inject/outject by calling Component

Contexts.getApplicationContext().set("hotNews", hotNews);
Contexts.getApplicationContext().get("hotNews");

by EL u can call object, but I don't know hot outject, but I think this sould be possible. Like in JSF form and input field or other field.

[swd847]

The answer to the @Out question is probably not. It is possible to get a reference to the Component metamodel and manually add a Bijected attribute, however if the class does not already have any @In's or @Out's then the BijectionInterceptor will be disabled, so it won't work anyway. It may be possible to get this to work, but it is the sort of thing that stands a good chance of breaking between releases. If you want to play around with it here is some code to get you started:

        Component c = (Component)Contexts.getApplicationContext().get("myComponent.component");
     List<BijectedAttribute<Out>> attributes = c.getOutAttributes();
     //now you have to create your own bijected field and add it to the list, the ones that 
     //seam uses are not public. You should be able to implment the interface yourself.
     List<Interceptor> interceptors = c.getInterceptors(InterceptorType.ANY);
     boolean found = false;
     for(Interceptor i : interceptors)
     {
         if(BijectionInterceptor.class.isAssignableFrom(i.getClass()))
         {
          found = true;
          break;
         }
     }
     if(!found)
     {
         c.addInterceptor(new BijectionInterceptor());
     }

Note that this code is totally untested and certainly not something that is in any way supported.

It is much easier to add factory method expression programmaticly, I use Init.instance().addFactoryMethodExpression().

[gbo3006]

Thanks guys! Basically I've needed it to overcome the seam-cannot-bind-conversation-scoped component issue. After struggling with the code trying your suggestions, I've revert to the school-like solution of creating an event-scoped child component.

Thanks,
Gilad