[rules-users] Math calculations on attributes in WHEN section of rules.

[tom ska]

Thanks for answer. I will look for info about eval (Expert User Guide - I
know where ;) ) But, even, if this works, what with Guvnor, and GUI based
rule constructor? How can I do it with Guvnor GUI?

2010/8/6 Swindells, Thomas <TSwindells at nds.com>

>  Have you looked at eval()?
>
>
>
> *From:* rules-users-bounces at lists.jboss.org [mailto:
> rules-users-bounces at lists.jboss.org] *On Behalf Of *tom ska
> *Sent:* 06 August 2010 10:49
> *To:* rules-users at lists.jboss.org
> *Subject:* [rules-users] Math calculations on attributes in WHEN section
> of rules.
>
>
>
> Hello,
> what I want to do, is to calculate on object's attributes in WHEN section
> of rule. Can I do it?
>
> For example:
>
> class CObj
> {
>               private int k;
>               private int n;
>
>               // setters and getters
> }
>
> Now what I want to do is:
>
> rule "r1"
>     when
>         p : CObj ( k + n <= 1000)
>     then
>         System.out.println("We love Drools :)");
> end
>
> Why can't I construct conditions like in Java, or C++ (with calculations in
> conditions)? How can I achieve my goal?
>
> Thx,
> Tom.
>
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