In this latest in the DoubleDawg series, we see that GeePaw is basically just never satisfied. It’s always pick pick pick with him!
[download id=”7″]
[flashvideo file=ddd/ddd5.mp4 /]
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The result of this session looks very much like the text book case of a Visitor, doesn’t it?
The double-dispatch provided by Visitor would be nice, though we can’t really add methods to the annotation-derived class, and we’d need a ‘VisitMe’ method. I think of Visitor as being always applied to tree-like structures, but of course it can operate on any heterogeneous collection.
What if we had an adapter around the annotation and *it* had the VisitMe call? That would feel good if we didn’t have to write an adapter for every annotation. Will think on it.
Looking through the class, I too have a very strong feeling that I would create a wrapper class for each annotation class, give them a common abstract base class, and then use reflection to find and create them and dispatch to them.
[Sorry; replied to wrong thread with previous post.]
Keep them coming… Faster. Faster
Question: How long does it take you to produce the cast?
Altogether it takes around six or seven hours. The first hour is usually all I need to decide where the refactorings are headed. Then I make the video. Oddly, I can’t seem to rehearse: if the camera isn’t rolling I don’t have the tingle of fear that gives me energy! I usually shoot about three times before I have something I like. Editing the video takes about two hours. That’s just editing for sound, I don’t re-organize the content or change what I’m doing. Friends at IL are happier with a “shoot-a-llitle-edit-a-little” approach, but I can’t seem to make that work for me.
It’s fun to do. This one’s hard because of the damned annotation stuff: we could trivially move the handlers onto a tree of handlers if we could just control how the annotation is derived. A little extra challenge. 🙂
Looking through the class, I too have a very strong feeling that I would create a wrapper class for each annotation class, give them a common abstract base class, and then use reflection to find and create them and dispatch to them.
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I notice that…
Validation -> processValidationPlural
Validations -> processValidationAnnotationSingular
(annotation name -> goes to -> method name)
So “Validation” is Plural, while “ValidationSSS” is Singular?
To be more consistent with the other methods, I would probably call them “processValidation” and “processValidations”.
I noticed that the code in the “processValidationAnnotationSingular” method contains copies of the code in nearly all of the other “process*” methods. (Everything except DoubleRangeFieldValidator.) I would suggest deleting the unnecessary null checks from that code, and then for each “process*Validator” method, extract all the lines except the first into a method of the same name, and then inline the original method (back into the processSingleAnnotation method). I think you’ll like the effect this will have on the processValidationAnnotationSingular/processValidations method.
(I see that the code duplication in the “processValidationAnnotationSingular” method was introduced when you did the “process*Annotation” inlines. Darn; I hate it when I do things like that! 😉