Or what about having a rule that creates the substring?
Class SupplierCode {
 
    private String code;
    private SupplierView parent;
 
    public SubString(SupplierView parent, String code) {
        this.code = code;
        this.parent = parent;
    }
 
    public String getCode() {
        return this.code;
    }
 
    public SupplierView getParent() {
        return this.parent;
    }
}
 
rule "suppliercode"
when
    $sv : SupplierView( $sc : suppCode )
then
    insert(new SupplierCode($sv, $sc.substring(4, 6)));
end
 
rule "main"
when
    $sv : SupplierView(corporate == true)
    $sc : SupplierCode( code in ('25, '30'), parent == $cs )
then
    ValidationErrorFacade.getInstance().registerError($cs, new ValidationError("Headquarter Supplier Code should end on 25 or 30."));
end
This way you are also making the business rule as to what supplier codes to accept a Drools rule (and no use of eval!)
 
(Sorry, a boring day at work and I felt an urge to contribute!)
 
Mike
From: rules-users-bounces@lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Manukyan, Sergey
Sent: 12 July 2007 21:40
To: Rules Users List
Subject: RE: [rules-users] how to create local variable

Thank you Edson,

 

I liked the solution with matches, it is much cleaner….

 

-Sergey

 

 

From: rules-users-bounces@lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Edson Tirelli
Sent: Thursday, July 12, 2007 4:19 PM
To: Rules Users List
Subject: Re: [rules-users] how to create local variable

 


    It is not possible to assign the result of an arbitrary method call to a variable right now. So, your best option is probably to do (please note the use of inline-eval):

rule "SupplierView: Headquarter Supplier Code should end on 25 or 30."

      when

            $cs : SupplierView(corporate == true, eval( suppCode.substring(4, 6).equals( "25" ) || suppCode.substring(4, 6).equals( "30" ) ) )

      then

            ValidationErrorFacade.getInstance().registerError($cs, new ValidationError("Headquarter Supplier Code should end on 25 or 30."));

end


    A more clean solution is to use "matches" operator. If your rule states that Supplier Code must END with 25 or 30, you can do:

rule "SupplierView: Headquarter Supplier Code should end on 25 or 30."

      when

            $cs : SupplierView(corporate == true, suppCode matches ".*25" || matches ".*30" )

      then

            ValidationErrorFacade.getInstance().registerError($cs, new ValidationError("Headquarter Supplier Code should end on 25 or 30."));

end


    Hope it helps.

    []s
    Edson

2007/7/12, Manukyan, Sergey < SManukyan@lear.com>:

Folks,

 

I have a rule where I am repeating part of it twice : ($cs.getSuppCode().substring(4, 6)), and I would like to replace it with variable… how can I do that? The solution with "in" doesn't worl because it is a java code needed to perform calculations for variable…..

 

Please see the rule below:

 

rule "SupplierView: Headquarter Supplier Code should end on 25 or 30."

      when

            $cs : SupplierView(corporate == true)

            eval($cs.getSuppCode().substring(4, 6) == "25" || $cs.getSuppCode().substring(4, 6) == "30")

      then

            ValidationErrorFacade.getInstance().registerError($cs, new ValidationError("Headquarter Supplier Code should end on 25 or 30."));

end

 

 

Thanks,

 

-Sergey

 

 

 

 

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  Edson Tirelli
  Software Engineer - JBoss Rules Core Developer
  Office: +55 11 3529-6000
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