[rules-users] [rule-users]how to create object properties in single stmnt

[Edson Tirelli]

    Sikkandar,

    In 3.0.6, if you have 2 strings in the working memory ("a" and "b" ) and
you write:

rule "cross product"
when
    $s1: String()
    $s2: String()
then
    System.out.println("[ "+$s1+", "+$s2+" ]");
end

   The result MUST be:

[ a, b ]
[ b, a ]

   If it is not that, then we have a bug, but our integration tests that
test this specific situation are working fine. Plz let us know if it is
different for you.
   In 4.0, the result must be:

[ a, b ]
[ b, a ]
[ a, a ]
[ b, b ]

   So a fact (by default) may match multiple simultaneous patterns.

   Regarding your second question, comparing properties of the same object
is also something we added for 4.0. In 3.0.x you need eval() too.

   []s
   Edson

2007/5/19, Sikkandar Nawabjan <Sikkandar.Nawabjan at ustri.com>:
>
> Hi ,
> The very reason i used to compare two object reference is that i got then
> executed multiple time when i do duplicate check between object properties.
> so i beleive the pattern match happen more than a time
> for example
>  when
>      $obj1:object($code:code,$stdate:startdate);
>      $obj2:object(code==$code,startdate=$stdate);
>  then
> if(obj1!=obj2)
>      System.out.println("Fired");
>
> My questions are
>
> 1) In 3.0.6 is there any other way to avoid this multiple check other than
> using eval(which affects performance i beleive). i can't use this operator
> in 3.0.6
>
> 2) related to this i have one more query. how to check properties within
> the object itself
>
> for example i want to do
>  when
>      $obj1:object($code:code,$stdate:startdate,$enddate:enddate > $stdate,
> reasoncode == $code);
>  then
>      System.out.println("Fired");
> i beleive the above throws error in 3.0.6 (nullpointer related to alpha
> node)
>
> Earlier reply is highly appreciated
>
> Thanks and Regs,
> Bassha
>
>
>
>
>
>
>
>
>
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Fri, 18 May 2007 09:51:34 -0300
> From: "Edson Tirelli" <tirelli at post.com>
> Subject: Re: [rules-users] how to check reference
> To: "Rules Users List" <rules-users at lists.jboss.org>
> Message-ID:
>         <e6dd5ba30705180551y6562b7f6oe5ea173379ebb4c8 at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
>    Yes, in 3.0.6 you will need eval. But also it is important to remember
> that by default, in 3.0.6, an object will never match more than one
> pattern.
> So in the given example, ob1 and ob2 will always be different and the
> check
> is not needed.
>    In 4.0, things are a bit different, as by default a single object may
> match more than one pattern at once and we introduced the "this" keyword
> to
> check for object identity.
>
>    []s
>    Edson
>
>
> 2007/5/18, Chris Woodrow <woodrow.chris at gmail.com>:
> >
> > Hi,
> > You can use eval();
> >
> > when
> >     $obj1:object();
> >     $obj2:object();
> >     eval ($obj1!=$obj2);
> > then
> >     System.out.println("Fired");
> >
> > Hope this helps
> > Chris
>
> _______________________________________________
> 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
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