I think qfhe wrote:
>
> Now my question is how I'm going to use those objects
> in rule specification. Suppose I added two instance of
> the same type Customer to the working memory. I want
> to define a rule to check whether the two customers
> have the same name. "name" is a private field in class
> Customer and I provide setter and getter methods in
> the class to access this field. Could you please give
> me some sample code to do this. Thanks very much.
>
You wouldn't say this as "if the two customers have different names",
but rather "if there's a customer with name ?n and a different
customer whose name is also ?n". This way the same rule works no
matter how many customers there are. One way to write this:
(defrule two-customers-same-name
;; Read this as "There's a Customer object ?o1 with name ?n"
(Customer (OBJECT ?o1) (name ?n))
;; Read this as "There's another Customer ?o2 which is not ?o1,
;; and whose name is also ?n
(Customer (OBJECT ?o2&~?o1) (name ?n))
=>
;; Here the variables ?o1 and ?o2 refer to the two Customer
;; objects, and ?n1 is their shared name; you can take
;; whatever action you like.
> p.s. The following example on the same page of the
> documentation seems require some other things to work.
> Is the source for this example available?
>
> (defrule 10%-volume-discount
> "Give a 10% discount to everybody who spends more
> than $100."
> (Order {total > 100})
> =>
> (add (new Offer "10% volume discount" (/ ?total 10))))
>
It would require a class named "Order" with a bean property "total",
and class "Offer" with a constructor that took a String and a number
as constructor arguments. The example should be complete in the final
release; note that Jess 7 is still in beta.
---------------------------------------------------------
Ernest Friedman-Hill
Advanced Software Research Phone: (925) 294-2154
Sandia National Labs FAX: (925) 294-2234
PO Box 969, MS 9012 [EMAIL PROTECTED]
Livermore, CA 94550 http://herzberg.ca.sandia.gov
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