[rules-users] Help Problem with kind of minimization

[Edson Tirelli]

    Hi,

    If you are using 4.0.0.M2, I think this will do the job:

function abs( int a, int b ) {
    return Math.abs( b - a );
}

rule "get closer object"
when
    $a : Agent( $num1 : num )
    $b : Poste( $num2 : num )
    not Poste( $num3 : num -> ( abs( $num1, $num3 ) < Math.abs( $num1, $num2
) ) )
then
    // do something
end

    If you are using 3.0.x, then it would be like:

function abs( Integer a, Integer b ) {
    return Math.abs( b.intValue() - a.intValue() );
}

rule "get closer object"
when
    $a : Agent( $num1 : num )
    $b : Poste( $num2 : num )
    not Poste( $num3 : num -> ( abs( $num1, $num3 ) < Math.abs( $num1, $num2
) ) )
then
    // do something
end

    Hope it helps. Let us know if it works the way you need.

    []s
    Edson


2007/5/3, l'ami molette <l_ami_molette at hotmail.com>:
>
>  Hi, I'm a new user of JBossRules, and I have difficulties to solve a
> problem using jBossRules.
>
>
>
> I have two classes (AClass.java & Bclass.java). Each one have a number (an
> "int" value (AClass.getNum() & BClass.getNum())
>
> , and I want to extract a Aclass & a Bclass witch have the closest
> numbers. In fact I want to minimize the value:
>
> Math.abs(AClass.getNum() - BClass.getNum()).
>
>
>
> I tried to write a rule like this:
>
>
>
> rule "My rule"
>
>             when
>
>                         ACl : Agent ($AClNum : num , $AClNom : nom)
>
>                         BCl : Poste ($BClNum : num , $BClNom : nom)
>
>                         BCl2 : Poste ()
>
>                         not Agent($ACl2Num : num ->
> (Aminor(CalculAbsolue($ACl2Num.intValue(),BCl2.getNum()) ,
> CalculAbsolue($AClNum.intValue(),$BClNum.intValue()) )))
>
>             then
>
>                         System.out.println("Selected : "+ ACl.getName() +"
> "+BCl.getName()+" diff: "+ CalculAbsolue(ACl.getNum(),BCl.getNum()));
>
>                         retract(ACl);
>
>                         retract(BCl);
>
> end
>
>
>
>     function int CalculAbsolue(int a, int b){
>
>             return Math.abs(b-a);
>
>     }
>
>
>
>     function boolean Aminor(int a, int b){
>
>             return a < b;
>
>     }
>
>
>
>     --> But the rule doesn't work.
>
>     Does anyone have an idea to solve my problem?
>
>     Thank you very much for your help.
>
>     Olivier Lafon
>
>
>
> PS : (excuse my English, I'm French)
>
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-- 
  Edson Tirelli
  Software Engineer - JBoss Rules Core Developer
  Office: +55 11 3529-6000
  Mobile: +55 11 9287-5646
  JBoss, a division of Red Hat @ www.jboss.com
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