[rules-users] Problem evaluating with Enum

[Wolfgang Laun]

ETimeConstraint is a (Java) identifier, for the enum type. There is no
way this can be "contains"-ed in any collection.

ETimeConstraint.name isn't any proper way of accessing anything in
connection with enum type ETimeConstraint.

Correct would be
    descriptor contains ETimeConstraint.TODAY

and, provided that contextIntention is of type ETimeConstraint, so is

    $cm:     Condition( $timeConstraint: contextIntention )
    $sentences: ArrayList() from
     collect (IPhoneSentences.Sentence(descriptor contains $timeConstraint

Notice that a List<Object> descriptor could contain
   ETimeConstraint.TODAY.name()
which is a String value.

-W


2011/9/13 Hezi Stern <hezis at delegatecom.com>:
> 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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>
>