I think what you're trying to do is this:
(defrule rule
"Rule"
(constant ?X&:(eq ?X ?*constant1*))
=>
(printout t "Constant Value -> " ?X crlf)
)
This rule fires, for example, if a fact (constant "foo") is asserted,
and the defglobal ?*constant1* contains the String "foo"; it prints
Constant Value -> foo
I think Bijal Modi wrote:
>
> Hello,
>
> I am trying to use some constants declared in a Java class in my Jess
> rules. I achieve this by defining a global variable:
>
> (defglobal ?*constant1* = (get-member Constants CONSTANT1))
>
> How can I use this constant in a rule? I want to do something like:
>
> (defrule rule
> "Rule"
> (constant ?*constant1*)
> =>
> (printout t "Constant Value -> " ?*constant1* crlf)
> )
>
> However, for obvious reasons, if I assert a fact (constant X), the
> printout
> is "Constant Value -> X" etc. How else can I define a constant which I
> can
> then use in LHS?
>
> thanks,
>
> -Bijal Modi
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Ernest Friedman-Hill
Distributed Systems Research Phone: (925) 294-2154
Sandia National Labs FAX: (925) 294-2234
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