Hi,
I have not fully grasped how Jess deals with Java class/interface
inheritance for LHS checks.
How must I use (defclass) and/or (deftemplate w/ from-class) and/or
(deftemplate w/ extends) to make Jess trigger rules where a fact's java
object would be an instanceof a "LHS type"
For example:
class A { Collection getCol() /* of IF */ }
interface IF { String getName() }
class C implements IF { String getName(); Integer getId() }
class D extends C { String getHobby(); }
class E implements IF { String getName(); String getCity() } /* not
related to C / D, just same IF */
lets assume I assert an object a::A with col = { c::C, d::D, e::E },
rules following:
(defclass A A nil) (defclass IF IF nil) (defclass C C nil) (defclass D D
C) (defclass E E nil)
(defrule r1 (A (col ?col)) => (foreach ?i ?col (definstance IF ?i))) /*
fire for a
if (definstance IF ?i) r2 will fire, but not r3 - r5?
if (add ?i) would use concrete class C, D, E but then r2 would not
fire? */
(defrule r2 (IF (name ?name)) => (printout t "name=" ?name)) /* fire for
c, d, e */
(defrule r3 (C (id ?id)) => (printout t "id=" ?id)) /* fire for c, d */
(defrule r4 (D (hobby ?hobby)) => (printout t "hobby=" ?hobby)) /* fire
for d */
(defrule r5 (E (city ?city)) => (printout t "city=" ?city)) /* fire for e */
Is it possible to completely mirror class/interface inheritance for Jess
templates/rules?
If not, what workarounds are possible e.g. to trigger the above rules
for the facts given as desired?
thanks in advance, Juergen
--------------------------------------------------------------------
To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]'
in the BODY of a message to [EMAIL PROTECTED], NOT to the list
(use your own address!) List problems? Notify [EMAIL PROTECTED]
--------------------------------------------------------------------
