[rules-users] how to perform some task when rule fails.

[Edson Tirelli]

    Hi,

    First, it would be better if you can use the constraints inside the same
pattern, avoiding subrule generation, instead of using multiple patterns:

Map( this["G250.18"] !=4 && this["G250.4"] not in("910","990","983","995",
"996","997")
        || this["G250.18"] ==4 && this["G250.4"] in
("910","990","983","995","996","997") )

    Remember that && has precedence over ||, but you can use () if you want
to make it explicit:

Map( ( this["G250.18"] !=4 && this["G250.4"] not in("910","990","983","995",
"996","997") )
        || ( this["G250.18"] ==4 && this["G250.4"] in
("910","990","983","995","996","997") ) )

    Now, answering your question, if you want to negate part of the whole of
the LHS, just use the "not" CE. Example:

rule "ValidationRuleExp_G250.4_0"
when
    not (
            IValidationField(attributeId =="G250.4") and
           Map( this["G250.18"] !=4 && this["G250.4"] not
in("910","990","983","995", "996","997")
                 || this["G250.18"] ==4 && this["G250.4"] in
("910","990","983","995","996","997") )
          )
then
    // do something
end

    Hope it helps,

    Edson

2007/9/18, Gaurav2007 <gaurav.a.joshi at capgemini.com>:
>
>
> Hi All,
>
> My requirment is that i want to send corresponding error when any rule
> fails.
>
> for example:
>
> rule "ValidationRuleExp_G250.4_0"
> when
> IValidationField(attributeId =="G250.4")
>
> (((Map( this["G250.18"] !=4))&&(Map( this["G250.4"]not
> in("910","990","983","995","996","997"))))||((Map( this["G250.18"]
> ==4))&&(Map( this["G250.4"] in("910","990","983","995","996","997")))))
>
> then
>
> System.out.println("comming
> here---Success-------------------------------------------------->");
> end
>
> In this case i can call some method in success,Is there any way so that i
> can call some method when any rule fails.
>
> the problem is that i am trying to generate rule file and all the
> validation
> expressions are already defined.
> my task is to evaluate these expression and generate corresponding error
> message when any rule fails
>
> can you please suggest me how can i do this using drools.
>
> Thanks,
> Gaurav
>
>
> --
> View this message in context:
> http://www.nabble.com/how-to-perform-some-task-when-rule-fails.-tf4475301.html#a12760314
> Sent from the drools - user mailing list archive at Nabble.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
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