I *think* you need to do something like this (?l is just the shadow fact
id):
(defclass Sphere Sphere)
(defclass LightBulb LightBulb)
(definstance LightBulb (new LightBulb "Halogen" 30))
(definstance LightBulb (new LightBulb "Floroscent" 40))
(defrule Rule1
(LightBulb (OBJECT ?bulb) (type "Halogen") (visRep))
=>
(bind ?sphere (new Sphere))
(definstance Sphere ?sphere dynamic)
(call ?bulb setVisRep ?sphere)
)
(run)
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]
> Sent: Monday, March 27, 2000 7:58 AM
> To: [EMAIL PROTECTED]
> Subject: JESS: Referencing instances of JavaBeans in Jess
>
>
>
> Can somebody help me in determining how to refer the
> instances of JavaBeans
> in Jess as for following example?
>
> ON JAVA SIDE
> Two JavaBeans "Sphere", "LightBulb" are defined as follows
>
> class LightBulb {
> private String type;
> private int watts;
> private Object visRep;
>
> public LightBulb{}
>
> public LightBulb(String type, int watts) {
> ...
> }
> get/set methods and propert_change_support_methods...
> }
>
> class Sphere {
> private float center;
> private float radius;
>
> get/set methods and propert_change_support_methods...
> }
>
>
> ON JESS SIDE
>
> (defclass Sphere Sphere)
> (defclass LightBulb LightBulb)
> (definstance LightBulb (new LightBulb "Halogen" 30))
> (definstance LightBulb (new LightBulb "Floroscent" 40))
>
> (defrule Rule1
> ?l <- (LightBulb (type "Halogen") (visRep))
> =>
> (bind ?sphere (new Sphere))
> (definstance Sphere ?sphere dynamic)
> (call ?l setVisRep ?sphere)
> )
> (run)
>
>
> Here we try to determine if lightbulb is of halogen type then set its
> visual representation as spherical shape.
> BUT ABOVE STMT (call ?l setVisRep ?sphere) fails.
>
> 1. Since after creation of JavaBeans in Jess, it creates
> shadow image as
> facts, now problem arises when trying to define rules which
> work over the
> facts and how to refer instances of JavaBeans corresponding
> to facts as in
> above case.
>
> 2. In Jess, the fact created corresponding to first instance
> of LightBulb
> is as follows
> (LightBulb (class <External-Address::java.lang.Class>)
> (type "Halogen")
> (watts 30) (visRep nil) (OBJECT <External-Address::LightBulb>)
>
> Does this OBJECT slotv alue refers to same instance of
> JavaBean?? Is it
> same as if I refered by "lb" variable as follows
>
> (bind ?lb (new LightBulb "Halogen" 30))
> (definstance LightBulb ?lb dynamic)
>
> 3. When I try to make any change to the corresponding JavaBean, Jess
> removes the original fact and creates a new fact with
> modified image of the
> JavaBean.
>
>
> Thanks in advance for any comments/help.
>
> Regards,
> Vikram
>
>
>
>
>
>
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