[rules-users] DRL authoring help

[Krishnan]

Hi Smitha,

They way I understand, in the then clause you would like to call a static
function from some class. So, then you can add that to the import and access
it directly. It does not have to be global. However, if for some reason you
do need to add it as a global,, let me know.

send that when part of the rule again.

-Krishnan.

On 6/18/07, Smitha Bhat <bhat_smitha at yahoo.com> wrote:
>
> Hi Krishnan,
> I need the functionality of being able to call methods of a global class
> in the 'then' piece of the drl. I had defined the drl file as:
>
> package test.tools.rulesengine
> import test.tools.rulesengine.Utilities;
> global test.tools.rulesengine.Utilities util;
>
> rule "Rule1".................
>
> When I debug the 'when' piece, I see that the method to check the name is
> being called, but tfter that, the global util's class method is not called.
> Any pointers would be helpful.
>
> Thanks,
> Smitha
>
> *Krishnan <krishiyer at gmail.com>* wrote:
>
> Hi Smitha,
>
> Rewrite the rule as follows :-
>
> rule "Rule1"
> when
> $Position1 : Position ( name matches "POS-RPT_0_1" )
> then
> $Position.setColor("red");
> end
>
> Note : You had something called util, unless it is a global, it will not
> work.
>
> -Krishnan.
>
> On 6/18/07, Smitha Bhat <bhat_smitha at yahoo.com> wrote:
> >
> > Hi,
> > I am new to JBoss rules. I have a .drl as given below:
> >
> > rule "Rule1"
> > when
> > $Position1 : Position()
> > eval($Position1.getName() contains "POS-RPT_0_1")
> > then
> >  util.setColor($Position1, "red");
> > end
> >
> > Before firing the rules, I assert my object as
> >
> > posIn = new Position(name,
> >      id,
> >      symbolCode,
> >      lonDouble,
> >      latDouble,
> >      elevDouble,
> >      reportDate,
> >      this);
> >     workingMemory.assertObject ( posIn );
> >     workingMemory.fireAllRules();
> >
> > I get the following error.
> >
> > org.drools.rule.InvalidRulePackage: Rule Compilation error The left-hand
> > side of an assignment must be a variable Syntax error on token "contains",
> > invalid AssignmentOperator
> > at org.drools.rule.Package.checkValidity(Unknown Source)
> > at org.drools.common.AbstractRuleBase.addPackage(Unknown Source)
> >
> > What is wrong with my drl? I have a Utilities class that I have defined
> > as global.
> >
> > Thanks
> >
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>
>
> --
> Sivaramakrishna Iyer Krishnan (Anand)
>
> Never assume the obvious is true.
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-- 
Sivaramakrishna Iyer Krishnan (Anand)

Never assume the obvious is true.
- William Safire
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