[rules-users] LHS Conditional Syntax for drl - date comparison with objects

[Costello, Robert]

I'm having a hard time understanding the syntax in the conditional or
left hand side of the DRL.  Is it acceptable to use dot notation in the
LHS?  Is there a better way to compare fields on different objects? 

 

In the example below, I get an error "Unable to find class $d1.  What
limitations are there syntactically on the left hand side?  Any help
would be greatly appreciated.  I have looked at all the examples and
have googled the problem and don't seem to find the answer.

 

package com.rules

 

#list any import classes here.

import com.validate.Date1

import com.validate.Date2

import java.util.Date

 

#declare any global variables here

 

rule "Your First Rule"

    

      when 

      $d1 : Date1()     

      $d2 : Date2()

      $d2 : Date2(beginDate > $d1.getEndDate)

      then 

            #actions

            System.out.println("do something");

end

 

Best regards,

 

Robert Costello

 

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