From: Hezi Stern <hezis@delegatecom.com>
Subject: [rules-users] Problem evaluating with Enum
To: rules-users@lists.jboss.org
Date: Tuesday, September 13, 2011, 3:54 PM

I have encountered the following problem using enums in drools.

 

I have an enum defined called ETimeConstraint, something of the sort:

 

public enum ETimeConstraint {

      NO_CONSTRAINT,

      TODAY,

TOMORROW,

;

}

 

Now I wish to filter sentences which reside in the working memory based on a time constraint which is of this enum type.

I created the following test rule

 

rule "My Test"   

      when                                           

            $sentences:       ArrayList()

                                    from collect (IPhoneSentences.Sentence(

                                                                        descriptor contains ETimeConstraint

                                                                           ))

      then

            //something

end

 

this does not work meaning no sentence are selected although I know that there are sentences in the working memory.

but when I add ETimeConstraint.name it does:

 

rule "My Test"   

      when                                           

            $sentences:       ArrayList()

                                    from collect (IPhoneSentences.Sentence(

                                                                        descriptor contains ETimeConstraint.name  

                                                                           ))

      then

            //something

end

 

I can stick to this workaround but it becomes very problematic to work this way. Furthermore once I wish to define a variable for example defining $timeConstraint :

 

rule "My Test"   

      when                                           

                  $cm:              Condition(

                                                $timeConstraint: contextIntention,                                                       

                                    )

                 

 

$sentences:       ArrayList()

                                    from collect (IPhoneSentences.Sentence(

                                                                        descriptor contains $timeConstraint

                                                                           ))

      then

            //something

end

 

 

this will not work because I can’t put $timeConstraint.name

 

any suggestions?

 

I am running:

-          Drools 5.2.0

-          Eclipse Helios

-          JBoss 5.1.0

 

 

Thanks

Hezi

 

 

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