Re: JESS: Interfaces and classes with shadow facts

[Ernest Friedman-Hill]

Jess treats classes and interfaces the same. Template inheritance  
models a single-inheritance tree, and each object can be in working  
memory just once, so there's no way to create multiple different trees  
of templates to match the same set of facts.

The basic idea of what you've shown below should work fine; is there a  
specific problem with it that I can help you with?


On Nov 3, 2009, at 8:40 AM, Joao Carlos Mourao wrote:

Hello,

I'm having some problems to use interfaces in Jess. I had make a  
search
in the mailing list, and although there were some messages over the
topic, i still was not able to really understand how the process  
works.
The problem is basic: I have a set of classes C, and a respective  
set of
interfaces I. I'm creating objects of classes C and adding to the
working memory. I would like use the interfaces I to access this  
objects
(in Jess). How?

Solutions:
   a) should i declare the classes, and work with the classes, leaving
the interfaces behind;
   b) declare the interfaces as (deftemplate I_name (declare
(from-class C_name)); Doesn't work, because when i try to match in a
rule, I_name is not the same as C_name, then Jess don't match
   c) have a combination of declarations of interfaces and classes,
like Russ did in a previous message
               "r.eval("(defclass IInterface1 IInterface1)");
                r.eval("(defclass IInterface2 IInterface2 extends
IInterface1)");
               r.eval("(defclass AbstractClassA AbstractClassA extends
IInterface2)");
               r.eval("(defclass ClassB ClassB extends  
AbstractClassA)");
               r.eval("(defclass ClassC ClassC extends  
AbstractClassA)");
               r.eval("(defclass ClassD ClassD extends  
IInterface2)");"
, which i have tried but haven't worked.

Any ideas?


Joao

-unclassified


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<joao.mourao.vcf>

---------------------------------------------------------
Ernest Friedman-Hill
Informatics & Decision Sciences          Phone: (925) 294-2154
Sandia National Labs
PO Box 969, MS 9012                            ejfr...@sandia.gov
Livermore, CA 94550                             http://www.jessrules.com





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