On 9 February 2011 16:49, jwillans2 <[email protected]> wrote:
>
> Hi Wolfgang,
>
> For example, the user may specify something along the lines of:
>
> rule "example"
> when
> Object(slot = "value")
>
An java.lang.Object doesn't have a property called "slot".
> then
> ..
> end
>
> Minimally we might want to rewrite the rule to strengthen the condition:
>
> rule "example"
> when
> Object(slot = "value", id = 125)
>
Let's say you want to check whether
Item( id == 125 )
and specify 125 only at runtime. Then you can write your rule as
ItemParam( field == "id", $value: value )
Item( id == $value )
But I'd prefer using templates and generate simple rules, even at runtime.
> then
> ..
> end
>
> Where 125 is not known until runtime. We may want to handle more complex
> cases where the user refers to "facts" that are conceptually scoped, but we
> may want to rewrite using "from":
>
> rule "example"
> when
> $op : ObjectProvider()
> Object(slot = "value") from op.eval()
>
Again, java.lang.Object is not useful. -- Why don't you simply insert the
objects
contained in ObjectProvider's eval field?
-W
> then
> ..
> end
>
> Thanks,
>
> James
>
> --
> View this message in context:
> http://drools-java-rules-engine.46999.n3.nabble.com/Rewriting-rules-tp2458626p2459318.html
> Sent from the Drools - User mailing list archive at Nabble.com.
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