We might not be using 4.0 so soon. The business is still to make a decision on that. In these scenarios what is way out to effectively code such kind of a scenarios.

If i make all my class attributes to be objects ( Double), then in the rule conditions i cannot use something like

1. attrib * 1.5, because it fails saying * cannot be applied to Double and double

2. attrib.doubleValue() * 1.5 isnt working. Complains that doubleValue() is not defined in java.lang.Object. attrib has been declared as Double in my object.

3. I havent tried a full analysis, but calling a function which does this calculation cant be called from the other half of the predicate. If say attrib2 > multiply(attrib1.doubleValue(), 1.5). It complains of not being able to resolve "multiply".

I have specifically observed difficulty to work things for the part coming after a > or a< etc. THe work around which i tried is

emi: EMIObject ( businessProfit1 > (businessProfit2 * 1.5) ) - This wont work

i have another variable in EMIObject, whic is declared double bp = businessProfit2 * 1.5;

emi: EMIObject ( businessProfit1 > bp ). This works, but i am forced to move some logic to the business object which should not be the case.

Let me know if there is a better way! Or am i missing any basics over here?

Any inputs are very useful.

On 7/18/07, Mark Proctor <mproctor@codehaus.org> wrote:

I believe all your requests are in 4.0, give that a try. For 2.0.6 you'll have to unwrap
> (bpl.doubleValue() * 1.5 )

Mark
Natraj Gudla wrote:
Hi All,

I am using Drools 3.0.6 and unable to perform some simple form of multiplication. I want to compare an object field with another field multiplied by a factor.

rule
"Calculate Business profit,1"
when

EMIAgainstProperty ( bp1 : businessProfit1 )
emi : EMIAgainstProperty ( businessProfit2 > (bp1*1.5) ) then
emi.setBusinessProfit((emi.getBusinessProfit1()+emi.getBusinessProfit2())/2);
end
I get an error on creation of the package that * is undefined for Double and double. I understand this is because Drools does an auto box on primitive type variables. But is there a work around to do simpler comparisons like this, especially on the right hand side of the condition. some thing like [ variable * constantValue ].

Also, i am forced to do a declaration for businessProfit1, and use in the comparison below. I am not able to compare two fields of the same object directly.

some thing like businessProfit2 > businessProfit1 does not work, why is this so? Any one has faced these problems earlier?

Thanks
Natraj
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