Hello Kevin,
Although I'm not really sure if I understand your question completely, this
is how I handle facts that have objects as parameters:
For example I have an object that represents the predicate Have, with two
slots: the owner and the possession. Owner is an object (of class Being) and
possession is also an object (of class PhysicalObject):
class Have
{
public Being m_owner;
public PhysicalObject m_possession;
}
I use defclass and definstance to transform a Have object into a Jess fact,
that looks something like this:
(MAIN::have (class <External-Address:java.lang.Class>) (owner
<External-Address:storyagents.storyworldontology.Being>) (possession
<External-Address:storyagents.storyworldontology.PhysicalObject>) (OBJECT
<External-Address:storyagents.storyworldontology.Have>))
When I want to match on this fact in a rule, I could do the following thing:
(defrule John-has-something
(have (owner ?o) (possession ?p))
=>
(if (eq (call ?o getName) "John) etc....
)
So the real check is performed after the =>. I don't know if this is the
right way to handle this and maybe there are more efficient methods, but I
don't know them ;-(
Bye,
Sander
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]On
> Behalf Of Kevin Kelly Aug
> Subject: JESS: Using complex java types in JESS
>
> I am attempting to create a java system that uses JESS as the back end
> knowledge base. I am allowing facts to use any java object as the
> parameters of the fact. Doing that in JESS is very straight forward.
> What I can't seem to figure out is how to match on those facts in a
> rule. Since the rule can only be created using the executeCommand
> method, I need to convert a match with java objects into some sort of
> JESS language string. I can't figure out how to do that.
> Does anybody
> know how to do this?
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