[rules-users] How to use contains with a function

[Welsh, Armand]

Wrap in in ()'s like this:

            $tc : TaskContext( times contains (getTimeByID(ETimeID.NOW)) )

I have not personally tried this exact scenario, but the concept is the same as other scenarios I use this for.  The ()'s identifies that evaluation should be used here, except that it's not really an eval() because the contents don't returne true/false, but rather it's just java code to be processed, and the output can then be used in the evaluation.

I do this with matches like this:

LookupFact ( $lookupValue : value )
$sf : SomeFact ( value matches ("(?i)" + $lookupValue) )



From: rules-users-bounces at lists.jboss.org [mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Hezi Stern
Sent: Wednesday, November 23, 2011 7:51 AM
To: rules-users at lists.jboss.org
Subject: [rules-users] How to use contains with a function

Hi all,

I encountered the following issue:

As an example TaskConectxt() holds a list of time related objects called times.
I would like to write a rule which ideally would filter the TaskContext according  to a specific time object.
The problematic restriction is that this time object is derived using a helper function (imported), in this case called getTimeByID which received as input an enum ID of a time and returns the desired time object.

Ideally the rule would like something like this:

rule "verify time"
      when

            $tc:                    TaskContext(times contains getTimeByID(ETimeID.NOW))
      then
            //something
end

unfortunately this does not work.
Is there any way to call a function with a param?
Is there a better alternative method than this one?

Thanks,
Hezi

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