I found that there is a Visitable interface, and almost all the classes of the composite-component model have implemented this interface. So it seems a Visitor Pattern applied. But in fact, it is just a un-finished work, the pattern is never used, no implement of Visitor interface.
Those Processors inside ModuleActivators just look like visitors, but they are not Visitor Pattern's visitors. So, I may ask for a favor, that some one could tell me the truth. --------------------------------- We won't tell. Get more on shows you hate to love (and love to hate): Yahoo! TV's Guilty Pleasures list.
