Hi Charles, This sounds rather like a JAVA question, but well
1. You should use the compareTo method, inherited from Comparable. 2. about the rules itself, it should be more something like $A1 : ActionArchive($mp1 : mediaPool); $A2 : ActionArchive(this != $A1, mediaPool.compareTo($mp1) < 0); 3. Having a huge number of actionArchives, you might want to consider storing them as an arra in a global variable and using the from operator in your rule. Hope this helps, Darko -------- Original-Nachricht -------- > Datum: Thu, 03 Jul 2008 17:17:51 -0500 > Von: Charles Binford <[EMAIL PROTECTED]> > An: [email protected] > Betreff: [rules-users] Comparing Strings (sort order) > I'm trying to figure out how to compare strings in drools. I'd prefer > to just be able to say something like: > when > obj(member > "string") > .... > > This doesn't work because the > or < operations are not allowed (though > I saw in a May 6th post Edson gave a pointer to how to add it.) Next I > tried using eval(). Based on everything I've read this should work. My > problem is getting the syntax correct. My object "ActionArchive" has a > member called "mediaPool". I'd like to choose the one with the lowest > (alphabetically) mediaPool string. > > Try one..... > rule "testme" > when > $ar : ActionArchive($mp : mediaPool) > not (eval (ActionArchive(getMediaPool().CompareTo($mp)) < 0)) > then > System.out.println("low mp= " + $ar.getMediaPool()); > end > ----------- > Rule Compilation error : [Rule name=junk, agendaGroup=MAIN, salience=0, > no-loop=false] > rules/Rule_testme_0.java (8:997) : The method getMediaPool() is > undefined for the type Rule_junk_0 > > > Try two...... > rule "testme" > when > $ar : ActionArchive($mp : mediaPool) > not (eval (ActionArchive(mediaPool.CompareTo($mp)) < 0)) > then > System.out.println("low mp= " + $ar.getMediaPool()); > end > ----------- > Rule Compilation error : [Rule name=testme, agendaGroup=MAIN, > salience=0, no-loop=false] > rules/Rule_testme_0.java (8:999) : mediaPool cannot be resolved > > Thanks for any pointers. > Charles > p.s. consider this a vote for adding > < support for Strings.... > _______________________________________________ > rules-users mailing list > [email protected] > https://lists.jboss.org/mailman/listinfo/rules-users -- GMX startet ShortView.de. Hier findest Du Leute mit Deinen Interessen! Jetzt dabei sein: http://www.shortview.de/[EMAIL PROTECTED] _______________________________________________ rules-users mailing list [email protected] https://lists.jboss.org/mailman/listinfo/rules-users
