Is the polymorphic CMP discussion still alive for anyone here? Some background links:
* http://www.onjava.com/lpt/a/2589, http://www.onjava.com/lpt/a/2697 * http://www2.theserverside.com/home/thread.jsp?thread_id=14161 * http://makeashorterlink.com/?H25C148C2 * http://www.mail-archive.com/xdoclet-user@lists.sourceforge.net/msg03831.html If there is a way to get this done without CMP container support (i.e., make it work on JBoss 3.0), I'd like to take a whack at it. I'm looking for information on how people have implemented polymorphism under apps using CMP, with or without XDoclet. XDoclet currently has some abilities with polymorphism, but only in what would be considered "Horizontal Mapping" by Proulx's definitions in http://www.onjava.com/lpt/a/2697. I'm more interested in "vertical mapping", with "language inheritance" as defined by O'Connor in http://www2.theserverside.com/home/thread.jsp?thread_id=14161. Has anyone done anything like this that they care to share the details on? I've been thinking about this all day and am running into various walls that I am happy to describe if there is anyone listening that wants to discuss it. In the end, I'd like to work on pulling it all together into some new tags and/or a subtask that can provide the ability for an "entity A" to have a CMP relation to an "entity B" where "entity B" has one of numerous potential subclasses that are automagically and correctly instantiated when the relation is followed. Following the link through a value object is perfectly reasonable and may be the best place to put the semantic duct tape and bailing wire for this. According to the Proulx article, WL7 has support for "multiple table mapping," with which a single entity maps to fields coming from two or more related tables. JBoss 4 is supposed to also have this functionality according to David Jencks. I presume this work is going on at the container level because there are hurdles that are impossible to otherwise get around in the problem, but I thought I would post this to see if anyone knew of restricted use cases that could be accomplished without the container functionality. I have a few ideas, including what I've pulled from the links above, but just wondering if there are strong opinions on this yet. thanks, -b ------------------------------------------------------- This sf.net email is sponsored by: With Great Power, Comes Great Responsibility Learn to use your power at OSDN's High Performance Computing Channel http://hpc.devchannel.org/ _______________________________________________ Xdoclet-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/xdoclet-user
