[rules-users] Ask for help on rule authoring

[Benson Fung]

If the age is String type, can I use Integer.parseInt(age) to change
to integer and then evaluate it?

like

when
   ad : ApplicationData(Integer.parseInt(age) < 0)
then
  ad.setReturnMsg("age should not be negative 0")
end




2011/3/26 Wolfgang Laun <wolfgang.laun at gmail.com>:
> Sorry, I don't use guided editors.
> -W
>
> On 25 March 2011 18:17, Benson Fung <benson.redhat at gmail.com> wrote:
>>
>> Hi Wolfgang,
>>
>> I managed to author this rule(ApplicationData( age == null || age ==
>> "" )) via Technical Rules editor of BRMS.
>> However, I cannot create this rule via Business Rule Guided Editor of
>> BRMS.
>>
>> Could you let me know how?
>>
>>
>> Thanks
>>
>>
>>
>> 2011/3/26 Wolfgang Laun <wolfgang.laun at gmail.com>:
>> > You can't use a method call as the left hand side operand in a
>> > constraint;
>> > thus
>> >    age.size() == 0
>> > is not correct.
>> >
>> > Do you really mean
>> >    age == "null"
>> >
>> > Probably
>> >   ApplicationData( age == null || age == "" )
>> > is the right thing to do, provided that ApplicationData.age is a String.
>> >
>> > -W
>> >
>> > On 25 March 2011 17:32, Benson Fung <benson.redhat at gmail.com> wrote:
>> >>
>> >> Hi,
>> >>
>> >> I got the following rule problem.
>> >>
>> >> The rule is like :
>> >>
>> >> 1.      |       rule "Rule1"
>> >> 2.      |           dialect "mvel"
>> >> 3.      |           when
>> >> 4.      |               ad : ApplicationData( age == "null" ,
>> >> age.size()
>> >> == 0)
>> >> 5.      |           then
>> >> 6.      |               ad.setReturnMsg( "age should not be null or
>> >> empty"
>> >> );
>> >> 7.      |       end
>> >>
>> >> where setReturnMsg is a method of ApplicationData Fact();
>> >>
>> >> However, I got the validation error :
>> >>
>> >> [Rule1] [ERR 101] Line 4:49 no viable alternative at input ')' in rule
>> >> "Rule1" in pattern ApplicationData
>> >> [Rule1] [ERR 102] Line 4:51 mismatched input '==' expecting ')' in
>> >> rule "Rule1" in pattern ApplicationData
>> >>
>> >> Please help what the problem is.
>> >>
>> >>
>> >> Thanks
>> >> _______________________________________________
>> >> rules-users mailing list
>> >> rules-users at lists.jboss.org
>> >> https://lists.jboss.org/mailman/listinfo/rules-users
>> >
>> >
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>> >
>>
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