If I remember correctly, for JUMP it was quite slow to determine this
programatically (I think you have to instantiate every class in the jar). So
instead we search based on the _name_ of the class, i.e., *PlugIn.class.
You should be able to do the same in your case if all classes that implement
that interface are named in some computable way.
Jon
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of
Sunburned Surveyor
Sent: Wednesday, April 04, 2007 3:33 PM
To: List for discussion of JPP development and use.
Subject: [JPP-Devel] Help with a Java problem...
I'm hoping you guys might be able to help me out with a Java problem I'm
having.
I can't seem to find a way to determine if a JAR file contains a class that
implements a particular interface. I need to be able to do discover this
programmatically. If the JAR file does contain an implementation of the
interface, I need to be able to obtain the Class object for that
implementation. I've been reading online, but haven't quite found what I
need. I think JUMP does something similar when it loads plug-ins, but I
peeked in the source code for the PlugInManager class and the
WorkbenchPropertiesFile class and didn't find what I needed.
I'm guessing it involves using the getEntry() method of the
java.util.jar.JarFile class. Is this correct?
After the Entry object is returned by getEntry(), how do I convert it to a
Class file?
Thanks,
The Sunburned Surveyor
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