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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