Re: JESS: Lisp is maddening

That's extremely close; the only problem is on the last line of the  
defglobal: (?hash-set) is an attempt to call the function whose name  
is in ?hash-set. That's not a function name, it's a map, so it doesn't  
work (the error is "method name expected, as Jess tries to call a  
method on that object). You want the progn to return "?hash-set", not  
"(?hash-set)" -- just drop those parentheses and you're good to go.

Another way to do this that would involve less typing: Jess lists turn  
into arrays when passed to Java functions. So you could do this:

(import java.util.*)
(defglobal ?*usps-state-code* =
     (new HashSet (call Arrays asList (list "AL" "AK" "AS" ...))))



On Sep 18, 2010, at 9:24 AM, Donald Winston wrote:

> Why doesn't this work?
>
> (defglobal ?*usps-state-codes* = (progn
>     (bind ?hash-set (new java.util.HashSet 59))
>     (call ?hash-set add "AL") (call ?hash-set add "AK") (call ?hash- 
> set add "AS") (call ?hash-set add "AZ")
>     (call ?hash-set add "CA") (call ?hash-set add "CO") (call ?hash- 
> set add "CT") (call ?hash-set add "DE")
>     (call ?hash-set add "DC") (call ?hash-set add "FM") (call ?hash- 
> set add "FL") (call ?hash-set add "GA")
>     (call ?hash-set add "GU") (call ?hash-set add "HI") (call ?hash- 
> set add "ID") (call ?hash-set add "IL")
>     (call ?hash-set add "IN") (call ?hash-set add "IA") (call ?hash- 
> set add "KS") (call ?hash-set add "KY")
>     (call ?hash-set add "LA") (call ?hash-set add "ME") (call ?hash- 
> set add "MH") (call ?hash-set add "MD")
>     (call ?hash-set add "MA") (call ?hash-set add "MI") (call ?hash- 
> set add "MN") (call ?hash-set add "MS")
>     (call ?hash-set add "MO") (call ?hash-set add "MT") (call ?hash- 
> set add "NE") (call ?hash-set add "NV")
>     (call ?hash-set add "NH") (call ?hash-set add "NJ") (call ?hash- 
> set add "NM") (call ?hash-set add "NC")
>     (call ?hash-set add "ND") (call ?hash-set add "MP") (call ?hash- 
> set add "OH") (call ?hash-set add "OK")
>     (call ?hash-set add "OR") (call ?hash-set add "PW") (call ?hash- 
> set add "PA") (call ?hash-set add "PR")
>     (call ?hash-set add "RI") (call ?hash-set add "SC") (call ?hash- 
> set add "SD") (call ?hash-set add "TN")
>     (call ?hash-set add "TX") (call ?hash-set add "UT") (call ?hash- 
> set add "VT") (call ?hash-set add "VI")
>     (call ?hash-set add "VA") (call ?hash-set add "WA") (call ?hash- 
> set add "WV") (call ?hash-set add "WI")
>     (call ?hash-set add "WY")
>     (?hash-set)))
>
> (printout t (call ?*usps-state-codes* contains "VA") crlf)
>
> I need to have a global variable that will contain state code values  
> after a (reset). list "AL" "AK" ... works but a HashSet would be  
> more efficient. A jess list is not a collection so I can't use the  
> HashSet(Collection) constructor.
>

---------------------------------------------------------
Ernest Friedman-Hill
Informatics & Decision Sciences, Sandia National Laboratories
PO Box 969, MS 9012, Livermore, CA 94550
http://www.jessrules.com







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