On Aug 14, 2007, at 5:20 AM, Noël Huebers wrote:
Hi,
I'm new to the Jess language and have some questions.
1. I work with Java object. I stored them in Jess with store and
assert/fetch commands.
But I could not call there member in the lhs of my rule. No
function calls allowed, right? So, for every object I made a rule
to insert a Jess template. This works fine, but is this way of
mapping Java objects to Jess facts and then discarding the object
the best way to work with java objects?
I'm afraid I don't quite understand what you're asking. If you're
pointing out that in Jess, you have to add objects to working memory
("insert a Jess template") before rules can act directly on them,
then yes, that's correct. I'm not sure what you mean about discarding
something.
2. I am trying to implement a counter-logic for specific slot
combinations. First, everytime a fact is inserted I check if there
is already a procounter fact. If not I create one. This works fine.
The next rule should recognize when a fact (EContext) is inserted
and the counter (procounter) already exists. In this case, the
count slot should only be modified. I try to compare bounded vars ?
s ?v ?t from EContext to procounter slots, but I think Jess simply
overwrites the binding. Can you help me with the correct syntax? Is
there a better logic to implement a counter?
What you've shown looks correct; you probably want to include a
"(declare (no-loop TRUE))" to the rule to avoid an infinite loop.
---------------------------------------------------------
Ernest Friedman-Hill
Advanced Software Research Phone: (925) 294-2154
Sandia National Labs FAX: (925) 294-2234
PO Box 969, MS 9012 [EMAIL PROTECTED]
Livermore, CA 94550 http://www.jessrules.com
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