Re: JESS: Re: Retrieve facts from Jess and re-instantiate them in Java

[Ernest Friedman-Hill]

Nothing wrong with that, if that's what you need to do. Every shadow  
fact also has a slot named OBJECT which contains the actual object,  
and so if you wanted to match that, you could call "getClass()" on it  
rather than using Class.forName().

Note if you use getShadowClassName() as suggested below, then you'll  
get the name of the class used to define the template, which might be  
an interface (in which case you can't instantiate it, of course.) If  
you use the OBJECT slot, as I suggest, then you'll get the actual  
class of the object behind the fact, and that may or may not be what  
you actually want.



On Nov 3, 2009, at 7:26 AM, Marco Zappatore wrote:


I think that a possible solution could be the following

val.factValue(context).getDeftemplate().getShadowClassName()

and then instantiate a new instance starting from the string that  
the above
method returns...

In any case, I'd like to know your opinion...



Marco Zappatore wrote:

Dear Jess users,
I have a rule "myrule" that fires whenever two facts with specific  
slot
contents are found within the working memory.
These facts are shadow facts.
Then I have a java user function "myUserFunction" that passes those  
two
facts (using their pointers, let's say ?f1 and ?f2) to a Java  
program.
My question is: is it possible to get those facts and instantiate  
them
again in Java?
In other words the procedure is:
1) define a java bean
2) assert shadow facts from that java bean with different slot  
contents
each time
3) find a given fact with a given content using a proper rule
4) pass the fact to a java program
5) create a new instance of the java bean with the content just  
retrieved

the problem resides at point n°5 because actually I'm using
Value val = vv.get(1).resolveValue(context);
Using val.factValue(context)) I can verify that the content is  
correct but
how can I use val to instantiate a new Java Bean?

Any help is appreciated, thanks in advance.

Marco Zappatore


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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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