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From "Roland Zwaga (JIRA)" <>
Subject [jira] [Commented] (FLEX-33332) Make metadata annotations first class AS3 citizens
Date Sun, 30 Dec 2012 14:24:12 GMT


Roland Zwaga commented on FLEX-33332:

As an addendum, I think this would be probably the simplest way of defining a list of value
constraints for an annotation argument:

public var options:Vector.<String> = new <String>("option1", "option2");

Obviously, if an argument is a class, the compiler can check if the qualified name exists:

public var clazz:Class;

It would be even nicer if somehow the Class value could be constrained as well, for instance,
the arguments needs to be
of type Class, but the Class needs to be a subclass of Event.

I don't have an immediate idea for a clean solution to that, so if anyone has ideas, please
chime in.
> Make metadata annotations first class AS3 citizens
> --------------------------------------------------
>                 Key: FLEX-33332
>                 URL:
>             Project: Apache Flex
>          Issue Type: Improvement
>          Components: Compiler API
>    Affects Versions: Apache Flex 4.9.0
>            Reporter: Roland Zwaga
>            Assignee: Michael Schmalle
>            Priority: Minor
> Currently metadata annotations are only checked by certain IDE's using some sort of extra
> Making metadata first class AS3 citizens would allow the compiler to check and verify
> So, for each metadata tag there would need to exist a corresponding AS3 class that describes
this tag,
> In practice, an annotation like this:
> [Bindable(event="dataChanged")]
> public var data:String;
> There would need to exist a class like this:
> [MetadataAnnotation]
> public class Bindable {
>   [Optional]
>   public var event:String;
> }
> Or something like that...
> The MetadataAnnotation metadata would be the entry point for the compiler. The actual
class would not necessarily need to be compiled in the eventual target. (Or maybe it should,
perhaps for JS cross-compilation this could actually enable annotation support...)
> Thoughts? Suggestions?

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