[rules-users] Concatenating rule conditions

[Hezi Stern]

Thanks for the reply, I think I was a bit vague with my question (my
apologies on this) I will try to elaborate further

 

I have several set of rules that filter, each filters a different set of
conditions (e.g. User, Date, Country.). 

I would like to construct rules that based on conditions in the
ConditionMatrix (in my example) I would like to set a specific rule set.

 

 

A wishful thinking approach would be something like:

 

Following are 2 filter rules

 

Rule "filter user"

 

When

            $cm:                                      ConditionMatrix(),

 

$document:                       ArrayList() from collect ( Document
(user.isPrivateName  == $cm.user.isPrivateName) )

 


Then

                

End

 

 

 

Rule "filter date"

 

When

            $cm:                                  ConditionMatrix(),

 

$document:                       ArrayList() from collect ( Document
(date.isLegal == $cm.date.isLegal) )

 


Then

                //do something

End

 

The actual rule that utilized them would like :

 

Rule "I am happy" extends "filter date"

 

When

                        $cm:     ConditionMatrix(),

 

Then

            //Do something

End

 

And a second rule can look like: (note that even if I can extend two rules
then there is a conflict on $ document)

 

Rule "I am sad" extends "filter date",  "filter user"

 

When

                        $cm:     ConditionMatrix(),

 

Then

            //Do something

End

 

Hope this clearer now.

 

Thanks

Hezi

 

 

From: rules-users-bounces at lists.jboss.org
[mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Wolfgang Laun
Sent: Wednesday, May 25, 2011 6:18 PM
To: Rules Users List
Subject: Re: [rules-users] Concatenating rule conditions

 

Just for the heck of it, here's two more ways for "comibining" those two
rules. (Gee, what a vague specification!)

# straightforwardly doing both in one
rule comb1
when
   $cm: ConditionMatrix()
   $docs1: ArrayList() from collect( Document( ... ) )
   $docs2: ArrayList() from collect( Document( ... ) )
then ... end

# abstraction
rule comb2
when
   $cm: ConditionMatrix()
   $filter: Filter()
   $docs: ArrayList() from collect( $d: Document() eval( $filter.pass( $cm,
$d ) ) )
then ... end

-W




2011/5/25 Vincent Legendre <vincent.legendre at eurodecision.com>

Not sure of what you exactly ...

If you want to combine tests, you can write this : 

Rule "test filter"
When
      $cm:  ConditionMatrix()

      $document:   ArrayList() from collect ( Document (user.isPrivateName
== $cm.isPrivateName, Payment.isLegal == $cm.isLegal) )

Then
                //do something
End

If you want to make the filter more dynamic and write only one "collect"
rule, I don't see any out-of-the-box method.
You can add a method in ConditionMatrix that accepts a Document and write
this rule :


Rule "test filter"
When
      $cm:  ConditionMatrix()

      $document:   ArrayList() from collect ( Document
(eval($cm.accept(this)) ) )

Then
                //do something
End

Of course you have to implement the "accept" method in Java (and you can
then do several sub-classes for you filters)


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