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
- the child object in the children collection to be the same as the
asserted child object or
- the equals/hashcode method to be implemented appropriately in Child
cheers
Steve
On 1/24/07, Anstis, Michael (M.) <[EMAIL PROTECTED]> 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
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