Use "shadow" facts.
see http://www.jessrules.com/jesswiki/view?FactsVsShadowFacts
On Nov 4, 2011, at 1:08 PM, Hunter McMillen wrote:
> Hi everyone,
>
> I am trying to assert to Jess that an object exists when I encounter a new
> object in my Java program. Right now I am using a template to mirror that
> object (i.e I have slot values for all of the Java objects fields) but this
> seems redundant to me. Is there any way to just bind a Java object to a Jess
> variable without creating a new Java object?
>
> A lot of the examples I see online and from JIA are of the form:
> (bind ?map (new HashMap))
>
> or
>
> (call Classname method params...)
>
> but these either create a new object or call static methods. I already have
> the Java object and just want to store it.
>
> But I was hoping that there was someway I could do something like this:
> public Rete engine = new Rete();
>
> public void unitDiscovered()
> {
> Unit unit = <some unit encountered>; //Java object
> engine.executeCommand("(bind ?unit unit)");
> engine.executeCommand("(assert ?unit)");
> }
>
> Or would I have to use the store() and fetch() methods for this?
>
> public void unitDiscovered()
> {
> Unit unit = <some unit encountered>; //Java object
> engine.store("UNIT", unit);
> engine.executeCommand("(bind ?unit (fetch "UNIT")");
> engine.executeCommand("(assert ?unit)");
> }
>
> Basically I want to know the best practice for binding Java objects to Jess
> variables so I can assert them to the engine.
>
> Thanks,
> Hunter McMillen
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