RE: [rules-users] how to create local variable

[Anstis, Michael \(M.\)]

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: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] 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: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] 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 < [EMAIL PROTECTED]>:

        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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