Hello, I'm trying to assert a new fact from Java. I
have an engine and I use this function.
public static void addCourse(String prefix,String
number,Rete engine) throws JessException{
Fact course = new Fact("add",engine);
course.setSlotValue("__data",new Value(new
ValueVector().
add(new Value(prefix,RU.ATOM)).
add(new Value(number,RU.ATOM)),RU.LIST));
engine.assertFact(course);
}
I then use a rule to take this fact (add whatever
whatevr) and modify an existing unordered fact.
(defrule Add_a_Course
?newcourse<-(add ?prefix ?number) ; If we wish to
add a course to the ones taken
?existing<-(course (prefix ?prefix)(number
?number)) ; we first find it in the catalog
=>
(assert (DEBUG_MESSAGE "Found Course: ?prefix
?number in catalog."))
(modify ?existing (taken yes)) ; and modify the
existing course to say we have taken it
(retract ?newcourse)
)
My template looks like this:
(deftemplate course
(slot prefix (default UNDEFINED))
(slot number (default UNDEFINED))
(slot Description (default "UNDEFINED"))
(slot credithours (default 0))
(slot classhours (default 0))
(slot labhours (default 0))
(slot college (default UNDEFINED))
(slot department (default UNDEFINED))
(slot taken (default no)))
and here are two examples:
(course
(prefix MAC)
(number 2311)
(credithours 4)
(classhours 4)
(labhours 0)
(college AS)
(department MATH)
(Description "Calculus with Analytic Geometry
I"))
(course
(prefix MAC)
(number 2311H)
(credithours 4)
(classhours 4)
(labhours 0)
(college AS)
(department MATH)
(Description "Calculus with Analytic Geometry
I (Honors)"))
My Problem is that when the course number contains
just numbers, the rule does not work,even though the
course is in the factbase. But when the course number
has a letter after it (ex. MAC2311H) it works fine. Is
there sime way to make Jess treat all number slots as
SYMBOLS and not integers?
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