[rules-users] logical 'not' - is there such a construct?
Edson Tirelli
tirelli at post.com
Tue Feb 20 14:37:10 EST 2007
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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>
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--
Edson Tirelli
Software Engineer - JBoss Rules Core Developer
Office: +55 11 3124-6000
Mobile: +55 11 9218-4151
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