[rules-users] Drools 5.4 : DRL : Issues using java.util.Map and > operator in Condition

[Davide Sottara]

I haven't checked 5.4, but in later versions you should be able to write:

when Map( this[ "age" ] > 18 )

Davide


On 12/27/2013 12:24 PM, Wolfgang Laun wrote:
> See inline.
>
> On 27/12/2013, anij <anijit.sarkar at gmail.com> wrote:
>> Hi,
>> I'm facing problem when I'm using Map and > Operator in condition section.
>> I'm using version 5.4.
>>
>> this is my RULE:
>> ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
>> package resouces.rules
>>
>> import java.util.*;
>>
>> rule "Valid Age_BNG"
>> agenda-group "Check user Eligibility_BNG"
>> salience 1
>> no-loop true
>> when
>> map : Map()
>>  eval(map.get("Age")  > 18  )
> This should work if map is Map<String,Integer>, but...
>
>> then
>> map.put("Age_Validation",true);
> ...this statement indicates that Boolean is acceptable as an entry
> type of Map map, too...
>
>> update(map);
>> System.out.println("RULE : "+drools.getRule().getName() );
>> end
>> ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
>>
>> And error message :
>> ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
>> Rule Compilation error : [Rule name='Valid Age_BNG']
>> 	resouces/rules/Rule_Valid_Age_BNG_d2a9c84690ba457b900a0578788bdd23.java
>> (8:313) : The operator > is undefined for the argument type(s) Object, int
> ...and the error message even indicates that some compiler thinks that
> the left hand side of the comparison has type java.Object. Therefore,
> it is reasonable to assume that the Map map is not Map<String,Integer>
> but Map<String,Object>.
>
> Try a plain old Java-style cast where you are sure that the map
> element is an Integer.
>
> -W
>
>> ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
>>
>>
>>
>> --
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>> http://drools.46999.n3.nabble.com/Drools-5-4-DRL-Issues-using-java-util-Map-and-operator-in-Condition-tp4027435.html
>> Sent from the Drools: User forum mailing list archive at Nabble.com.
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