directory listing in core protocol

Fri Mar 30 21:00:00 GMT 2007

Hello All,
Is it possible to get a directory listing of files from the core 
protocol? Currently, I can't even getClass().getResource() to return a 
valid URL for a directory, but it does work if I specify a file. 
For example, if I have the following in my jar when I compile
foo
 - someResource.txt
 adir
 - a.txt
 - b.txt
I can get an URL for foo/someResource.txt, and I can open an InputStream 
and get the contents.
But if I try getClass().getResource("/foo/adir"), I get null.
Thanks,
Ben