Hi,
There are several things wrong here.
First, you need to use a defglobal if you want a variable that can be
shared between rules. I believe the original poster of this suggestion
did so. ?ht is a local variable at the command prompt and can't be
accessed from rules. See manual section 2.3.1 about defglobals.
Second, your first executeCommand() call below uses the wrong syntax
for (bind) - there should be no equals sign.
Third, that same call contains two function calls - executeCommand
will ignore the second one.
Fourth, if the rule CheckDiscount-1 fires twice or more, the previous
results will be overwritten since you reuse the same Hashtable keys.
I think Matteo Melideo wrote:
[Charset iso-8859-1 unsupported, filtering to ASCII...]
> Hi All,
>
> I am always having problem with a rules that has to return me more than one value. I
>have thought that perhaps the best thing to do to manage them was to use the
>java.util.Hashtable. Just in case I prefer to show you my code.
>
> Here it is:
>
> ...
>
> r.executeCommand ("(bind ?ht = (new java.util.Hashtable)) (store RESULT ?ht)");
>
> r.executeCommand("(defrule CheckDiscount-1 " +
>
> " (prodotto ?x) " +
>
> " (utenti (id ?y) (scelta ?x)) " +
>
> " => " +
>
> " (call ?ht put \"key1\" ?y))" +
>
> " (call ?ht put \"key2\" ?x))");
>
> r.run();
>
> Hashtable ht = (Hashtable)r.fetch("RESULT").externalAddressValue(null);
>
> for (int y= 1; y < ht.size(); y++)
>
> System.out.println("Il Sig. Tizio con Num. Ord " + (Integer)ht.get("key1") + "ha
>ottenuto 4 scatolette di " + (String)ht.get("key2") + " al 5%
>di sconto");
>
> The message error returned at run time is this one:
> Jess reported an error in routine call while executing (call ?ht put "key2" ?x).
>
> Message: No method named 'put' found in class java.lang.String.
>
> Program text: ( call ?ht put "key2" ?x ) at line 0.
>
> ...
>
> I thank all of you in advance for the help and apologize for the disturb.
>
> Bye
>
> --
> Matteo Melideo
> Direct Phone: +39 06 44741145 - Operator: +39 06 4474111
> Engineering SpA - R&D Lab -, Fax: +39 06 4465981
> Viale del Castro Pretorio, 116 E-mail: [EMAIL PROTECTED] or [EMAIL PROTECTED]
> 00184 Roma - Italy
> --
>
---------------------------------------------------------
Ernest Friedman-Hill
Distributed Systems Research Phone: (925) 294-2154
Sandia National Labs FAX: (925) 294-2234
Org. 8920, MS 9012 [EMAIL PROTECTED]
PO Box 969 http://herzberg.ca.sandia.gov
Livermore, CA 94550
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