[rules-users] Unable to perform simple primitive operations

[Natraj Gudla]

Mark,

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;
and then
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.

Thanks
Natraj


On 7/18/07, Mark Proctor <mproctor at 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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