I think [EMAIL PROTECTED] wrote:
>
> Ernest,
> Thanks for the answers to my previous questions, now I have another one.
> Could you please explain why following code behaves differently in Jess 4.3
> and 5.0a3:
>
> (deftemplate param
> (multislot groups))
>
> (defrule test-empty-multislot
> ?f <- (param (groups))
> =>
> (modify ?f (groups 1))
> (printout t "modified" crlf))
>
> (assert (param))
> (run)
>
> In Jess 4.3 rule "test-empty-multislot" executes once.
> In Jess 5.0a3 it enters infinite loop.
>
> Thanks.
>
> Miroslav Madecki, I/T specialist - RS/6000
> Internet: [EMAIL PROTECTED]
> Tel: +385-1-6308-156, Fax: +385-1-6111-119
> IBM Croatia, Lastovska 23, 10000 Zagreb, Croatia
>
This one is a bug - thanks for finding it. You have to make two
trivial changes to fix this: in jess/ReteCompiler.java, at line 296,
change
if (p.getSlotLength(j) != 0)
to
if (p.getSlotLength(j) != -1)
And in jess/Pattern.java, at line 335, change
return 0;
to
return -1;
---------------------------------------------------------
Ernest Friedman-Hill
Distributed Systems Research Phone: (925) 294-2154
Sandia National Labs FAX: (925) 294-2234
Org. 8920, MS 9214 [EMAIL PROTECTED]
PO Box 969 http://herzberg.ca.sandia.gov
Livermore, CA 94550
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