Re: How to find all classes in package XXX implementing interface YYY
On Aug 28, 2:14 pm, Lew <l...@lewscanon.com> wrote:
Sideswipe wrote:
in someway to load all classes in a
given package that implement an interface.
Hunter Gratzner wrote:
Since a package is open-ended you can't find all classes in a given
package. Please spare us the discussion of this fact. If you don't
believe it, read the Java spec. Without having all potential
candidates you can't find all classes in a given package that
implement a particular interface.
I assume this is possible but the documentation isn't jumping out at
me on how that's done.
It is not possible.
To expound slightly more on Hunter's point, though as he says if you google
around the Usenet archives you will find quite a bit on this FAQ, new classes
can appear in a package any time. You'd have to run your search for infinite
time.
It's like making a dictionary of every word in the English language. The
language changes while you're compiling the list. You can never finish, Sisyphus.
--
Lew
Often people think of this as a solution to the service provider
pattern. Java has a specification for providing service providers. I
suggest you look at it.
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