[rules-users] logical 'not' - is there such a construct?

[Olenin, Vladimir (MOH)]

So, if used like that, 'not' does not have 'existential' meaning then, but
simple 'negation'? I mean, the expression

   not MyObject(field == 'value')

would still mean 'not exists', correct? Would the expression

   not (MyObject(field == 'value'))

mean 

   MyObject(field != 'value')

then. In other worlds, "all objects OTHER then those matching the
constraint"?

Thanks.

Vlad

-----Original Message-----
From: rules-users-bounces at lists.jboss.org
[mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Edson Tirelli
Sent: 20 February 2007 14:37
To: Rules Users List
Subject: Re: [rules-users] logical 'not' - is there such a construct?

  Vlad,

In 3.1M1 you can write:

rule X
when
not (
MyObject( aaa == "bbb" ) and
MyObject2( bbb == "aaa" )
)
then
// do something
end

But remember that variables bound inside the "not" block are not avaible 
in the consequence for obvious reasons.

[]s
Edson

Olenin, Vladimir (MOH) wrote:

> Hi,
>
> I wonder if there is logical 'not' operator (in the meaning of "!=" -> 
> 'not equal') which can be applied to the whole rule? Eg:
>
> Rule x
>
> When
>
> ! (
>
> MyObject(aaa == "bbb")
>
> MyObject2(bbb == "aaa")
>
> )
>
> Then
>
> // do smth
>
> End
>
> Basically I'm looking for an operator to reverse the evaluation result 
> of the expression in the brackets. The use case: in my system all 
> rules are defined from 'rule passes' prospective, while the 
> application should take some action in case the rule is NOT passed 
> (ie, 'else' case).
>
> Any way to do that except reformulating the constraints themselves?
>
> Thanks,
>
> Vlad
>
>------------------------------------------------------------------------
>
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>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 3124-6000
 Mobile: +55 11 9218-4151
 JBoss, a division of Red Hat @ www.jboss.com


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