[rules-users] is there anyway to access to lower level of an attribute in LHS

[Tim.Nguyen at expeditors.com]

Thank you very much!!



Tim


                                                                           
             "Edson Tirelli"                                               
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                                       Re: [rules-users] is there anyway   
             08/30/2007 12:22          to access to lower level of an      
             PM                        attribute in LHS                    
                                                                           
                                                                           
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   Did you tried:

   Person( contact != null, contact.email == null )

   ?

   Edson


2007/8/30, Tim.Nguyen at expeditors.com <Tim.Nguyen at expeditors.com>:
  Hi group,

  Currently I have to use eval to access to lower lever of an attribute.
  For
  example:

  rule "test rule"
       when
        $person: Person ()
        eval (($person.getContact() != null) &&
  ($person.getContact().getEmail() == null))
       then
        System.out.println ("Email address is missing")
  end


  Is there anyway not to use eval. I would like to do something like this:
        $person: Person ($contact: contact != null, $contact.getEmail() ==
  null)

  but it throws errors


  Thanks,

  Tim

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  Edson Tirelli
  Software Engineer - JBoss Rules Core Developer
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