RE: [rules-users] logical 'not' - is there such a construct?
In effect, is such construct is allowed now in 3.1M?
not (
exists MyObject2(field == 'value')
)
I'm just not sure what 'not' element as an 'existential operation'
will do
in case it's passed 'boolean' result as an operand. Would it act as a
logical negation? I understand that the above construct can be simply
expressed by removing 'exists' altogether, but the problem is that the above
is the result of 'automatic template' generation (ie, there is a sequence of
columns with 'exists' and 'not' elements and in case there is only one
such
element the generation might result in the above construct).
Thanks,
Vlad
-----Original Message-----
From: rules-users-bounces(a)lists.jboss.org
[mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Edson Tirelli
Sent: 20 February 2007 16:30
To: Rules Users List
Subject: Re: [rules-users] logical 'not' - is there such a construct?
No, the "not" conditional element is an existential operator, so the
meaning is what you expressed in your first example. I thought that was
what you were looking for, but apparently it is not.
I never heard about any construction capable of doing what you are
asking for in a rules engine... maybe someone else can throw some light
in...
[]s
Edson
Olenin, Vladimir (MOH) wrote:
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(a)lists.jboss.org
[mailto:rules-users-bounces@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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>
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--
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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