Thanks Steve,
 
Is contains in 3.0.5 - I can't find reference to it in the bundled documentation?
 
Also, do you know whether Object's equals() and Object's hashCode() are used for normal equality conditions:-
 
when
    h : house()
    p : person ( residence == ( h ) )
...
 
Do you also know how the greater than and less than operators are implemented (can we provide a comparator instance)?
 
when
    r : rank()
    p : person (rank >= ( r ) )
...
 
(If this is even possible!?!? - I haven't got this far yet).
 
Thanks in advance.
 
Mike
 

From: rules-users-bounces@lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Steven Williams
Sent: 23 January 2007 23:00
To: Rules Users List
Subject: Re: [rules-users] Rules to detect states in an object graph?!?

Hi Michael,

To do the opposite approach (where the relationship is navigable from the parent only) you can use the following:

when
        c : Child ( age > 18 )
        Parent ( children contains c, type == "SMURF" )

Of course this requires either
cheers
Steve

On 1/24/07, Anstis, Michael (M.) <manstis1@ford.com> wrote:

Sorry, me again,

I'm putting together some prototype rules that operate on related objects in a graph of objects.

I'm adding all objects individually to working memory and then checking the objects are related in the rule to ensure only valid combinations are selected; for example:-

//Java code
parent.addChild(child)
wm.assertObject(parent);
wm.assertObject(child);

//Rule
rule "Adult smurfs"
when
        c : Child ( age > 18, p : parent )
        Parent ( parentId == ( p.parentId ) , type == "SMURF" )
then
        System.out.println("Smurf " + p.getName() + " is " + c.getAge() + " years old."
end

rule "Adult clangers"
when
        c : Child ( age > 18, p : parent )
        Parent ( parentId == ( p.parentId ) , type == "CLANGER" )
then
        System.out.println("Clanger " + p.getName() + " is " + c.getAge() + " years old."
end

This requires that the parent-child relationship is navigable from the child end of the relationship -- child.getParent() .

What other approaches does anyone else use to implement rules that span related objects?

With kind regards,

Michael Anstis
-------------------------------------------
Next Generation Estimating System
( Trafford House (Int) 8 718 2239
( Trafford House (Ext) +44 (0)1268 702239
* < mailto:manstis1@ford.com>


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