I don’t know your circumstances, but you might question why rank is a String in the first place.  Is the UI unduly influencing your data model?  You could always add a synthetic getter to your model itself and evade the eval altogether:

public  int getRankInt() { … }

That’s an ugly hack, but if your rank attribute is really an integer anyway…

In any case, I’d suggest that you add a guard in your conversion utility to check for “” and null Strings maybe default to 0 or throw some exception.

Cheers,

-Jess

From: rules-users-bounces@lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of M.DILIP KUMAR
Sent: Tuesday, December 02, 2008 5:40 AM
To: Rules Users List
Subject: Re: [rules-users] Inline eval problem!

Hi ,

   i can suggest one more way to solve it. Dont create instance in when part.

Instead of better you convert that helper class method as static methods.

So that u can call that method directly . but before that u should import that helper class in drl file.

   Or second way u can directly write a method in ur drl file itself.

Example :

import com.g2x.agility.leads.workflow.rulesengine.RuleUtilities;

rule"ConvertRule"

when

           eval ( RuleUtilities.getStringToInteger( age) > 40)

// getStringToInteger(String age) is static method

then

    System.out.print("XXXXName");

end

Defeat yourself today!

____________________________

DILIP  KUMAR.M

--- On Tue, 2/12/08, vanshi <nilu.thakur@gmail.com> wrote:

From: vanshi <nilu.thakur@gmail.com>
Subject: [rules-users] Inline eval problem!
To: rules-users@lists.jboss.org
Date: Tuesday, 2 December, 2008, 10:38 AM

I need to convert a variable from string to intger in the rule. That variable
here is rank, so, I create a helper class called 'Conversion' with just
one
function/method, which is supposed to convert the string argument passed to
it, to an integer and then I call that method in rule as inline eval.
What's
wrong here because this is not working and I don't want to change
'When'
part too much because it has 10 or so other variable with &&
connective,
which I've removed for clarity here. Any input would be appreciated much.
 
package harules;
import com.hibernate.Person;
import com.uhg.utils.Conversion;
 
rule "one"
salience 10
        when
        $con: Conversion();
        pers: Person(age!= null , age >= 18 , eval($con.getInteger(rank) > 140))
        then
        System.out.println("Evaluated true");
end
 
//content of Conversion class
package com.utils;
public class Conversion {
public Integer getInteger(String s)
{
        return Integer.parseInt(s);
}
}
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