Hi Glenn,
I've been having a bit of trouble following this thread; the
terminology is a bit non-standard. How about I show a working example
of something, and you tell me why it's not what you want:
;----------------------------------------------------------------------
Jess, the Java Expert System Shell
Copyright (C) 1998 E.J. Friedman Hill and the Sandia Corporation
Jess Version 4.1b6 8/20/98
Jess> (set-reset-globals FALSE)
FALSE
Jess> (defglobal ?*tf* = (new java.awt.TextField))
TRUE
Jess> (deftemplate holder (slot field))
TRUE
Jess> (deffacts my-facts (holder (field ?*tf*)))
TRUE
Jess> (defrule test-rule
(holder (field ?f))
=>
(printout t ?f crlf))
TRUE
Jess> (reset)
TRUE
Jess> (run)
<External-Address:java.awt.TextField>
TRUE
Jess>
;----------------------------------------------------------------------
I think Glenn Williams wrote:
>
> Thanks for the reply.
>
> > Obviously, the "?e <- (editor (field ?tf))" will only work on the
> > LHS of a rule, allowing you to access the TextField object on the
> > RHS via the bound value ?tf. To access externals outside of a rule,
>
> The problem is when I try to bind the value of the external to ?tf, the
> pattern never match's. The following never match's, even though there are
> facts which it should fire on. externalObserver is bound to an external
> java.awt.TextField.
>
> ( dependency ( subject ?addressID ) ( externalObserver ?observer ) )
>
> I want to put external global's in facts, retrieve them, and use them.
>
> glenn
>
> > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On
> > Behalf Of Al Davis
> >
> > Glenn,
> >
> > Obviously, the "?e <- (editor (field ?tf))" will only work on the
> > LHS of a rule, allowing you to access the TextField object on the
> > RHS via the bound value ?tf. To access externals outside of a rule,
> > try using the store/fetch methods or directly use your global.
> >
> >
> > On Wed, 26 Aug 1998, Glenn Williams wrote:
> >
> > > I'd like to do the following:
> > > ( deftemplate editor ( slot field ) )
> > > ( defglobal ?*t* = new java.awt.textField )
> > >
> > > ( assert editor ( field ?*t* ) )
> > >
> > > This works, the reference is loaded into editor, but how do I
> > retrieve it?
> > >
> > > I tried:
> > >
> > > ?e <- ( editor ( field ?tf ) )
> > >
> > > which fails.
> > >
> > > How do I can I get and use the external reference?
> > >
> > > glenn
> > >
> > > >
---------------------------------------------------------
Ernest Friedman-Hill
Distributed Systems Research Phone: (510) 294-2154
Sandia National Labs FAX: (510) 294-2234
Org. 8920, MS 9214 [EMAIL PROTECTED]
PO Box 969 http://herzberg.ca.sandia.gov
Livermore, CA 94550
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