Re: JESS: Multiple shadow facts

[Ernest Friedman-Hill]

"get-member" returns the value of an actual member variable, using the  
exact name of the variable. It works only on accessible members.

"get" works on JavaBeans properties; you pass the name of the property  
("foo") and Jess calls the accessor method ("getFoo") to get the value.

So presumably your bean class "B" does not have a public member  
variable "sB" -- not at all surprising!


On Nov 29, 2009, at 7:59 AM, Marco Zappatore wrote:


I answer to myself:
if you substitute "get-member" with "get" in myRule1 (see quotation)  
it
works.



Marco Zappatore wrote:


Dear JESS users,
I'm working with shadow facts and my question is the following:
let's suppose I have 3 java beans
1) A (with slot sA)
2) B (with slot sB)
3) C

the type for the sA slot is the java bean B itself and the type for  
the sB
slot is C.

First I definstanced C, then I definstanced B. I used the OBJECT  
slot of
the
shadow fact C as content for sB and I retracted C.
Finally I definstanced A. I filled again the sA slot with the  
OBJECT slot
of
the shadow fact B and I retracted B too.
Now I have to write a rule that has to verify directly in A whether  
or not
C
is in sB.

My trials:

(defrule myRule1
?f <- (A (sA ?a &: (instanceof (get-member ?a sB) C))
=>
;do something)

(defrule myRule2
?f <- (A (sA ?a))
 (B (OBJECT ?a) (sB ?b &: (instanceof ?b C)))
=>
;do something)

didn't work...
Any idea?

Many thanks in advance
 Marco Zappatore
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Ernest Friedman-Hill
Informatics & Decision Sciences, Sandia National Laboratories
PO Box 969, MS 9012, Livermore, CA 94550
http://www.jessrules.com







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