[rules-users] accumulate funtion in xml

[Fernando Meyer]

Could you please provide your Instance class ?


On 9/27/07, Isabelle Hupont <ihupont at ita.es> wrote:
>
>
> Hi!
>
> I want to program the following drl rule in xml:
>
> rule "average calculation"
>         no-loop true
>         when
>                 _i : Instance()
>                 _average : Double()
>                                 from accumulate(accInst: Instance(),
>                                                        average(
> accInst.value("tend")))
>                 eval(_average < 20000)
>         then
>                 _i.setValue("tend",2000);
> end
>
>
> For it, I have implemented the following xml file:
>
> <?xml version="1.0" encoding="UTF-8"?>
> <package name="org.prophet.fuzzy" xmlns="http://drools.org/drools-4.0"
>     xmlns:xs="http://www.w3.org/2001/XMLSchema-instance"
> xs:schemaLocation="http://drools.org/drools-4.0 drools-4.0.xsd">
>     <import name="weka.core.*"/>
>     <import name="org.prophet.gui.docking.*"/>
>     <import name="org.prophet.persistence.*"/>
>     <import name="org.prophet.persistence.hibernate.*"/>
>     <import name="org.prophet.rules.*"/>
>     <import name="org.prophet.*"/>
>     <rule name="Rule1">
>         <rule-attribute name="no-loop" value="true"/>
>         <lhs>
>             <pattern identifier="_i" object-type="Instance"/>
>             <pattern identifier="_average" object-type="Double">
>                 <from>
>                     <accumulate>
>                         <pattern identifier="accInst"
> object-type="Instance"/>
>                         <external-function evaluator="average"
> expression="accInst.value(&quot;tend&quot;)"/>
>                     </accumulate>
>                 </from>
>             </pattern>
>             <eval>_average &lt; 20000.0</eval>
>         </lhs>
>         <rhs>
> _i.setValue("tend", 2000.0); manageRuleFired("Rule1", null, _i);
> modify(_i);</rhs>
>     </rule>
> </package>
>
> And I have the following error when reading the rule package:
>
> org.drools.rule.InvalidRulePackage: Rule Compilation error _average cannot
> be resolved _i cannot be resolved _i cannot be resolved _i__Handle__
> cannot
> be resolved _i cannot be resolved
>
>
> I also have tried to replace the xml identifier <pattern> by <column> with
> no result. Can you help me, please?
>
>
> --
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> http://www.nabble.com/accumulate-funtion-in-xml-tf4526879.html#a12916380
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>
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>



-- 
Fernando Meyer http://fmeyer.org
JBoss Rules Core Developer
fmcamargo at gmail.com
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