[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: rules-users-bounces at lists.jboss.org
[mailto:rules-users-bounces at 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 at lists.jboss.org
[mailto:rules-users-bounces at 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 at 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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	  JBoss, a division of Red Hat @ www.jboss.com 

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