[rules-users] Minor Issue in writing DSL

[Saleem Lakhani]

Thanks Edson. That helped. One more thing, can't we execute something
simple like: ObjectA(units != families)

When both units & families are defined as int in ObjectA with their
public get and set methods. This is the exception I am receiving.

 

org.drools.rule.InvalidRulePackage: Unable to return Declaration for
identifier 'families' : [Rule name=Rule6, agendaGroup=Rating,
salience=0, no-loop=false] Its even showing correctly in drl editor. If
I swap the positions of units & families then the same exception is
thrown for 'units'. 

 

regards,

saleem

-----Original Message-----
From: rules-users-bounces at lists.jboss.org
[mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Edson Tirelli
Sent: Tuesday, August 21, 2007 1:56 PM
To: Rules Users List
Subject: Re: [rules-users] Minor Issue in writing DSL

 


   Saleem,

   For sure, your mapping must have some typo or mistake. A rule like
this works and is correct:

rule XYZ
when
    ObjectA( application==true || banker==true || officer==true )
then
  // do something
end

    Drools does NOT inspect object fields... only public methods.

    If you are using a DSL, make sure your "drl" file is named "dslr"
(this is new in 4.0), so when you open it in eclipse, you have a tab
that shows you the result of the DSL template processing. This way you
will be able to see any eventual mapping mistake.

    []s
    Edson


2007/8/21, Saleem Lakhani < Saleem.Lakhani at citizensfla.com>:

When I use the syntax below and write like: 

 

[when]ABC=ObjectA(application==true || banker==true || officer==true)

 

on drl it gives me the following error:

 

Multiple markers at this line:

-        unknown:116:39 Unexpected token '=='

-        unknown:116:25 Unexpected token '||'

-        unknown:116:64 Unexpected token '=='

 

Again, there are NO attributes in ObjectA named application, banker or
officer.

 

Thanks

 

 

 

-----Original Message-----
From: rules-users-bounces at lists.jboss.org [mailto:
rules-users-bounces at lists.jboss.org
<mailto:rules-users-bounces at lists.jboss.org> ] On Behalf Of Edson
Tirelli
Sent: Tuesday, August 21, 2007 9:49 AM
To: Rules Users List
Subject: Re: [rules-users] Minor Issue in writing DSL

 


   Drools respects encapsulation, so it works with javabean method name
conventions. If you have a method isApplication() that returns a
boolean, does not matter how your class calculates the return value.
Same for any other method. In 4.0, you can write:

ObjectA( application == true || banker == true )

   To map that as a DSL, just follow your usual procedure and syntax.

   []s
   Edson

2007/8/21, Saleem Lakhani < Saleem.Lakhani at citizensfla.com>:

Hi,

 

If I had a rule written in DSL using Drools 3.0 like;

 

1.      [when] when1=r : ObjectA( )

2.      [when] when2=eval(r.isApplication() || r.isBanker())

 

There are no attributes in class Object with name application and banker
but there are methods in ObjectA with names isApplication() & isBanker()
which does some work and return Boolean based on some facts.

 

What is the correct way of writing the same rule using Drools 4.0 ?

 

Also, if the above attributes were present in ObjectA what would have
been the best way to write it in DSL using Drools 4.0

 

Thanks,

 

 


_______________________________________________
rules-users mailing list
rules-users at lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users




-- 
  Edson Tirelli
  Software Engineer - JBoss Rules Core Developer
  Office: +55 11 3529-6000
  Mobile: +55 11 9287-5646 
  JBoss, a division of Red Hat @ www.jboss.com 


_______________________________________________
rules-users mailing list
rules-users at lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users




-- 
  Edson Tirelli
  Software Engineer - JBoss Rules Core Developer
  Office: +55 11 3529-6000
  Mobile: +55 11 9287-5646 
  JBoss, a division of Red Hat @ www.jboss.com 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.jboss.org/pipermail/rules-users/attachments/20070821/6d491e86/attachment.html