[rules-users] DRL authoring help

[Smitha Bhat]

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) 

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