[rules-users] Ask for help on rule authoring

[Wolfgang Laun]

Assuming you have

   class ApplicationData{ String age; int intAge;... }

you might do
   rule one
   when
      ad : ApplicationData( $age: age != null && != "" && matches "\\d+" )
   then
      modify( ad ){ setIntAge( Integer.parseInt($age)  ) }
   end
  rule two
   when
      ad : ApplicationData( intAge < 0 )
   then
      ...error...
   end

Or, anoither possibilitie:
  when
   ad : ApplicationData( $age: age != null && != "" && matches "\\d+" )
   eval( Integer.parseInt($age) < 0 )
 then
   ...error...
 end

-W
On 25 March 2011 18:46, Benson Fung <benson.redhat at gmail.com> wrote:

> so how can I change it to integer in the rule?
>
>
>
> 2011/3/26 Wolfgang Laun <wolfgang.laun at gmail.com>:
> > If it's stored in a fact field of type int: yes.
> >
> > The way you write it: no.
> >
> > -W
> >
> >
> > On 25 March 2011 18:37, Benson Fung <benson.redhat at gmail.com> wrote:
> >>
> >> 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
> >> >> >
> >> >> >
> >> >> > _______________________________________________
> >> >> > rules-users mailing list
> >> >> > rules-users at lists.jboss.org
> >> >> > https://lists.jboss.org/mailman/listinfo/rules-users
> >> >> >
> >> >> >
> >> >>
> >> >> _______________________________________________
> >> >> rules-users mailing list
> >> >> rules-users at lists.jboss.org
> >> >> https://lists.jboss.org/mailman/listinfo/rules-users
> >> >
> >> >
> >> > _______________________________________________
> >> > 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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>
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