[rules-users] DRL authoring help

[Krishnan]

hi smitha,

did not understand what you were trying to do ?. can you send me a code
snippet along with the drl file and I will be able to help you better .

thanks,
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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