[weld-dev] Abstract decorators

[Marius Bogoevici]

The specification allows for decorators to be abstract classes, but this 
is currently not supported in Weld (defect WELD-298).

Since allowing decorator classes to be abstract is the only stated 
requirement, here are the general lines I think we should follow for 
supporting this:

- abstract decorator classes can have injected fields, injected 
constructor parameters and concrete initializer methods, but abstract 
initializer methods should be forbidden (DefinitionException), or at the 
very least be non-portable.
- abstract decorator classes cannot have abstract  decorating methods 
(DefinitionException)

WDYT?

Marius