[rules-users] Issues with float/double constants

[Edson Tirelli]

   Looks like bugs. The first one is probably in drools code, while the
second one is on mvel.

   Can you please open a jira for them?

   Thanks,
       Edson

2008/3/1, Andrey Grin <andrey.grin at gmail.com>:
>
> Hi,
>
> I have two issues with float/double constants. In both cases dialect is
> set to MVEL
>
> Issue 1
>
> If I use a comparison operator with the Double value it doesn't seem to
> work correctly w/o brackets in the right part of the expression:
>
> Example:
> I have a condition like:
> NumberVariable( owner == $a, name == "PTI", value > 0.5)
>
> In the class NumberVariable the method getValue() is declared as follows:
> public Number getValue();
>
> In the working memory I have an instance with name == "PTI" and value ==
> 0.9633716684527102 ( actual type of the value is  Double).
>
> And the rule consequence is not executed.
>
> If I change it and add brackets around the constant everything works
> correctly:
>
> NumberVariable( owner == $a, name == "PTI", value > (0.5) )
>
> There is similar example in drools documentation (w/o brackets):
>
> Cheese( type == "stilton", price < 10, age == "mature" )
>
> I assume that in this example the property has a primitive type and in my
> case autoboxing is involved, but why brackets are necessary in my case?
>
>
> Issue 2
>
> I have a rule:
>
> rule "Determine min PRI for for PROD2"  ruleflow-group
> "budget_calculated_variables_appl"
>     when
>         $a: RetailApplication( )
>         StringVariable(name=="prodid", value matches CONST.PROD2)
>     then
>         insert(new NumberVariable("minPTI", 0.6, $a));
> end
>
> Initially I had only one constructor for NumberVariable:
>
> public NumberVariable(String pName, Number pValue, Object pOwner)
>
> But MVEL couldn't find this constructor when "then" part was executed
> (runtime exception).
> The problem was solved when I added another constructor:
>
> public NumberVariable(String pName, float pValue, Object pOwner)
>
> Java compiler accepts identical code when only first constructor is there:
>
> NumberVariable nv = new NumberVariable("minPTI", 0.6, null);
>
> Drools version: 4.04, Java version: 1.6
>
> Thanks,
>  Andrey.
>
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>
>


-- 
  Edson Tirelli
  JBoss Drools Core Development
  Office: +55 11 3529-6000
  Mobile: +55 11 9287-5646
  JBoss, a division of Red Hat @ www.jboss.com
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