Class filter, in need of

I'm looking for a class filter. Do you know of one? Do you have any pointers for designing one?
I'm thinking it would work like this:
You've got a big set of classes. These classes implement various interfaces- some implement one, some implement several.
You make a filter. The filter is a combination of interface-names and boolean operators. For example, you could make the filter "interface_x AND interface_y", and get all classes that implement both of those interfaces. Putting an OR in place of the AND would deliver classes that implemented EITHER of those 2 interfaces.
Simple?
Ok, so this filter would take a big string containing interface class names and standard boolean operators as it's parameter. Or something like that.
Does such a thing exist? It should. It seems really useful and fundamental and obvious.

-What do you mean "a big pile of classes"?
large undifferentiated set. Big list.
-Where do you get the classes?
Off my app's package tree
-Do you want to filter every class on the classpath?
not quite. All the irrelavent classes are weeded out when the pile is compiled.
-Do you have a list of relevant class names?
that would be the pile.
-If so, it seems like it would be easier to manage the list than to introspect the individual classes.
But the individual classes contain the details I want to inspect.
-An application of this, I would think, would be to allow you to drop in a class or a jar in a relevant place, and have the application discover it and deal appropriately with it, which is why I thought you might be interested in the service provider interface.
It seemed to be extra work. Easy enough to crawl the tree and inspect classes I figure.
-Maybe the BeanContext stuff would help?
I was thinking similarly. I looked at it some but I'll look at it some more.
-What invokes the filtering that you want?
A method with a filter specification (a boolean filter description consisting of class-names and boolean operators in reverse-polish) as a parameter.
-Once you filter, what are you planning to do with the result set?
Grab a class from it at random or some other logic or filter the set further.
U gonna write it for me too? =)
I'm just gonna write it. I already have it half written. It ain't so hard. My main issue/laziness was parsing my filter specifications (the boolean statements). I just discovered the marvels of reverse-polish notation. Wow! It's a breeze now.
Thanx
J

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