Hi Ernest;
Oops, I'm can't believe I did that...the code below works great. Thanks. I'm
just discovering the power of manipulating java object's directly.
Especially GUI's.
glenn
( defrule testExtern
( dependency ( externalObserver ?eo ) )
=>
( printout t ?eo crlf )
(set ?eo background ( get-member java.awt.Color red ))
)
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On
> Behalf Of Ernest Friedman-Hill
> Sent: Thursday, August 27, 1998 2:05 PM
> To: [EMAIL PROTECTED]
> Subject: Re: JESS: Referencing externals
>
>
> Hi Glenn -
>
> You're not binding the variable ?f anywhere in this rule; ?f is
> therefore of type 8 (= RU.VARIABLE, an unassigned variable). Ordinary
> variables are limited to the scope in which they're used; i.e., you
> can't bind something to an ordinary variable in one rule and read it
> in another. You could use a defglobal for this purpose (?*tf* in the
> example below), -or- you could explicitly bind a local to the value
> you're interested in on this rule's LHS (i.e., given my example below,
> including the pattern
>
> (holder (field ?f))
>
> on the rule's left-hand-side would make your testExtern rule work.)
>
>
> I think Glenn Williams wrote:
> >
> > When I try to use the slot value as follows:
> >
> > ( defrule testExtern
> > ( dependency ( externalObserver ?eo ) )
> > =>
> > ( printout t ?eo crlf )
> > (set ?f background ( get-member java.awt.Color red ))
> > )
> >
> > I get the following exception:
> >
> > Rete Exception in routine Value::externalAddressValue while executing
> > defrule testExtern while executing deffunction quitButton-handler.
> > Message: Not an external address: ?f type = 8
> >
> > Any clues?
> >
> > > -----Original Message-----
> > > From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]On
> > > Behalf Of Ernest Friedman-Hill
> > > Sent: Wednesday, August 26, 1998 4:09 PM
> > > To: [EMAIL PROTECTED]
> > > Subject: Re: JESS: Referencing externals
> > >
> > >
> > > 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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> >
> >
>
>
> ---------------------------------------------------------
> 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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