Has anybody tried using enums as shadow facts? I've been getting some
apparently bizarre results. Forgive me for showing actual code, but I
don't understand the problem well enough to produce a simple example.
Producers have activities that produce waste of various kinds. There is
an enum WastePackagingMaterials defined as follows:
public enum WastePackagingMaterial {
paper_board(.49, 5), glass(.24, 7), steel(.05, 3), aluminium(.01,
9), plastic(.09, 10), wood(.12, 6);
...
Each activity of each producer produces one unit of one of these types
of waste.
A rule has the following RHS
(assert
(packaging-waste-produced
(wpm ?wpm)
(quantity ?level)
(activity ?activity)
(timestep ?t)
(clauseOwner ?producer)
(tickStamp ?t)))
A second rule fires once for each producer and has the following RHS
(bind ?wpm-list (create$ (call WastePackagingMaterial values)))
(foreach ?wpm ?wpm-list
(printout t (?wpm toString) crlf)
(bind ?quantity (total-packaging-waste ?producer ?wpm))
(assert
(total-packaging-waste-produced
(wpm ?wpm)
(quantity ?quantity)
(timestep ?t)
(clauseOwner ?producer)
(tickStamp ?t))
where total-packaging-waste is a function that calls the following defquery:
(defquery waste-packaging-material-query
(declare (max-background-rules 100000)(variables ?producer ?wpm))
(packaging-waste-produced
(wpm ?wpm)
(quantity ?quantity)
(activity ?activity)
(timestep ?)
(clauseOwner ?producer)
(tickStamp ?)))
This defquery calls the relevant instantiations from the first rule
except -- and this is what seems bizarre -- it gets the facts for the
first constant of the enum for the first rule instantiation only but it
gets all of the facts for all of the other constants (i.e., all but
paper_board) for all of the producers.
If there is some stupid bug in my code, then I shall be as grateful as I
will be ashamed if someone could point it out to me. If it isn't my
bug, then there is a problem with using enums in the current (b6)
version of Jess7.
--
Professor Scott Moss
Centre for Policy Modelling
Manchester Metropolitan University
Aytoun Building
Manchester M1 3GH
UNITED KINGDOM
telephone: +44 (0)161 247 3886
mobile: +44 (0)7740 942564
fax: +44 (0)161 247 6802
http://cfpm.org/~scott
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