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

[Scott Reed]

*Try this:
*

*rule* "Your First Rule"

   

      *when*

      $d1 : Date1( $end1: endDate )    

      $d2 : Date2()

      $d2 : Date2( beginDate > $end1 )

      *then*

            #actions

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

*end*



Costello, Robert wrote:
>
> 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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>
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