Hmmm... the only way I can see this is possible (i.e. with the use of accumulate) is to use transient facts:-

This can be set-up with a decision table quite easily (and ValuedRegion can be a declarative type that extends Region adding the "value" field)

rule "setup ValuedRegions - using a decision table"
    when
        $Region( $score : score )
    then
        insertLogical( new ValuedRegion( $score, [a value] ) );
end

Your rule

rule "Calculate Value"
   when
       $c : Company()
       $r : Region()
       $val : Double() from accumulate (ValuedRegion($score : score, $value : value ) , sum($score * $value))
   then
       // Do Something
end

On 10 April 2012 14:51, Davout <davout1805@gmail.com> wrote:
Hello,

I'm trying to figure out how I can use a Decision Table as a lookup table. I
did come across
http://drools.46999.n3.nabble.com/Rules-with-Lookup-Tables-td56996.html
however, it asking about using a database.

Typical Senario:
Where [value from lookup table] is the value retrieved from the Decision
Table. The reason I'm looking at a Decision Table rather than using a
database is because the number of conditions needs to be changeable by end
users.

rule "Calculate Value"
   when
       $c : Company()
       $r : Region()
       $val : Double()
           from accumulate (Region($score : score) , sum($score * [value
from lookup table]))
   then
       // Do Something
end

Thanks.

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