Looks like my code is missing a parenthesis; you must've added it back
in the wrong place, so that OBJECT looked like its own pattern, and
not like a slot:
(InetModem (publicIpAddress ?publicIpAddress) (OBJECT ?inetModem))
The very last parenthesis on the line is the new one. SOrry about that!
On Aug 21, 2009, at 11:24 AM, Romain Van der Keilen wrote:
I understand the principle.
That's true the following code give me an access to the java object:
(defrule validate-virtualsite
(VirtualSite (inetModem ?inetModem))
=>
(printout t "Virtual site: " ?inetModem crlf)
)
With the following output :
Virtual site: <Java-Object:be.uniway.rvk.jesstest.model.InetModem>
But (because there's sadly a but)
The notation with the Object slot doesn't seems to work. Eclipse
warn me with this message if it can help:
Created implied ordered template at token 'OBJECT'
I'm completely lost :/
Thanks for your help!
Romain Van der Keilen.
-----Original Message-----
From: [email protected] [mailto:owner-jess-
[email protected]] On Behalf Of Ernest Friedman-Hill
Sent: vendredi 21 août 2009 17:14
To: jess-users
Subject: Re: JESS: Accessing Java objects fields from a defrule
Ah, OK, here's the thing: your patterns
?inetModem <- (InetModem (publicIpAddress ?publicIpAddress))
(VirtualSite (inetModem ?inetModem))
are checking that the jess.Fact object representing the InetModem in
working memory is in the inetModem slot of the VirtualSite fact -- but
it's not. The inetModem slot contains the actual Java InetModem
object. You get at that object by using the OBJECT slot, not by
binding the whole fact:
(InetModem (publicIpAddress ?publicIpAddress) (OBJECT ?inetModem)
(VirtualSite (inetModem ?inetModem))
That should do you.
On Aug 21, 2009, at 11:04 AM, Romain Van der Keilen wrote:
All getters and setters are present, respecting the jababeans
conventions:
Those methods are in Virtualsite
public InetModem getInetModem() {
return inetModem;
}
public void setInetModem(InetModem inetModem) {
this.inetModem = inetModem;
}
And those are in InetModem
public String getPublicIpAddress() {
return publicIpAddress;
}
public void setPublicIpAddress(String publicIpAddress) {
this.publicIpAddress = publicIpAddress;
}
So I don't really see what's wrong ...
Thanks,
Romain Van der Keilen.
-----Original Message-----
From: [email protected] [mailto:owner-jess-
[email protected]] On Behalf Of Ernest Friedman-Hill
Sent: vendredi 21 août 2009 16:54
To: jess-users
Subject: Re: JESS: Accessing Java objects fields from a defrule
Normally, slots in Jess templates are based on JavaBeans properties
--
i.e., a method named "getInetModem" will give rise to a slot named
"inetModem". If you include the "include-variables TRUE" declaration,
then slots will also be created based on *public* member variables.
Under no circumstances will Jess create slots based on private member
variables.
On Aug 21, 2009, at 10:39 AM, Romain Van der Keilen wrote:
Here is the exact code I use:
(import be.uniway.rvk.jesstest.model.*)
(deftemplate VirtualSite (declare (from-class VirtualSite)))
(deftemplate InetModem (declare (from-class InetModem)))
(defrule validate-virtualsite
"Just put the validate attribute to true!"
?inetModem <- (InetModem (publicIpAddress ?publicIpAddress))
(VirtualSite (inetModem ?inetModem))
=>
(printout t "Internet modem address: " ?publicIpAddress crlf)
)
Using:
VirtualSite
+ private InetModem inetModem
InetModem
+ private String publicIpAddress
Maybe the private fields are disturbing Jess?
Regards,
Romain Van der Keilen.
From: [email protected] [mailto:owner-jess-
[email protected]] On Behalf Of Romain Van der Keilen
Sent: vendredi 21 août 2009 16:15
To: [email protected]
Subject: RE: JESS: Accessing Java objects fields from a defrule
Thanks for the response,
You've exactly put the finger on what I wish do, but I just tried
that and I've no output :s
From: [email protected] [mailto:owner-jess-
[email protected]] On Behalf Of Wolfgang Laun
Sent: vendredi 21 août 2009 15:41
To: [email protected]
Subject: Re: JESS: Accessing Java objects fields from a defrule
First, you bind to the contained object, and then you locate the
containing object.
(defrule mydoor
?door <- (Door (weight ?weight)(color ?color))
(House (myDoor ?door)(owner "Mick"))
=>
(printout t "Weight of Mick's door :" ?weight crlf)
)
Restrictions on weight or color, e.g., to paint red doors black ;-)
can be added in the usual way.
-W
On Fri, Aug 21, 2009 at 12:12 PM, Romain Van der Keilen
<[email protected]
wrote:
Hi there,
I have a little question for you I can't fix by myself: how to
access the fields of a java Object that is itself a field of an
other java object?
Here is a tiny sample :
Object Door
+ int weight
+ String color
Object House
+ Door myDoor
Now I give the House to the Rete engine, how can I access (and
manipulate) for example the weight of my door?
By now I just can display it like this:
(defrule mydoor
(House (myDoor ?myDoor))
=>
(printout t "Weight of my house's door :" ?myDoor.weight crlf)
)
But the thing I want to do is to catch that weight to make some
checks on it, then displaying the checks' results (for examples, is
my door heavier than 25kg).
Thanks for help
Romain Van der Keilen
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Informatics & Decision Sciences Phone: (925) 294-2154
Sandia National Labs
PO Box 969, MS 9012 [email protected]
Livermore, CA 94550 http://www.jessrules.com
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Informatics & Decision Sciences, Sandia National Laboratories
PO Box 969, MS 9012, Livermore, CA 94550
http://www.jessrules.com
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Ernest Friedman-Hill
Informatics & Decision Sciences Phone: (925) 294-2154
Sandia National Labs
PO Box 969, MS 9012 [email protected]
Livermore, CA 94550 http://www.jessrules.com
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