Finding all classes with a particular annotation in a GWT generator

I'm hitting a bit of a roadblock. 

I have a bunch of classes in the gwt client/shared annotated as @Foo (custom annotation), and I have a FooGenerator which is being called via <generate-with> in my gwt.xml file.

What I'd like FooGenerator to be able to do, is to find all the @Foo annotated classes, and then do some further processing on those files.

I also want this to be a reusable module, so I could <inherit> it in other modules, and have it do the same thing for @Foo annotated classes.

My question is, how can I find all the @Foo annotated classes when my generator is called during rebind? 

Would greatly appreciate any help.

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