Hello List,
as a total Jess novice (but rather experienced Java programmer), I feel
a little embarassed to ask so fundamental questions like the following one.
I have a simple Java class called "Course" with three private final int
attributes and the corresponding get-methods. I instantiated three
objects from this class and want to add these Objects as Facts to the
working memory of Jess so that I can access the attributes (and mathods)
of the objects as slots of the facts.
Using r.defclass(Course, Course, null) -(r is my Rete Object)- resulted
in an error - the class Course wasn't found.
Instead, I used something like this:
Fact f1 = new Fact("course", r);
f1.setSlotValue("crn", new Value(new Integer(1)));
f1.setSlotValue("starttime", new Value(new Integer(1110)));
f1.setSlotValue("endtime", new Value(new Integer(1230)));
r.assertFact(f1);
(crn, starttime and endtime or the private final int attributes).
This allowed me to assert the course as a fact. But... is there no way
to do this, say, a little more stream-lined?
Also, I wonder how I can define a rule from Java in Jess that allows me
to check whether or not two facts have the same content in a slot and,
iff true, do something.
r.eval("(defrule r1 (forall (course (starttime ?time))) =>
(printout t \"Warining! Time collision!\" crlf))");
Did not work, as it terminated with an ArrayIndexOutOfBounceException at
Index 4.
I am really sorry to ask these very basic questions. However, I coulnd't
find answers in the manual-homepage, the wiki or the list archive.
Thank you for your help,
Bastian
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