[rules-users] check whether a key is present in global Map, i.e. mimicking containsKey() behavior

[esstrata]

Hello,

  I'm using Drools 5.1.1 in a JavaSE 6 project.

I can't get running a rule where a value obtained from WM is check for
existence as a key of a global Map.

I have a map of the type ProductTextCode -> Product, where keys are String
and values Product
/global Map productMap/

Then in a rule a I want a condition where each String in WM is tested
against map keyset.
/
rule "Product ID not in products map"
    dialect "mvel"  
    when
        $pid : String()		
        => Here goes the condition <=
    then
        System.out.println("Invalid product id: " + $pid)
    	retract ($pid)
    end
/

So far I've tried with productMap.containsKey($pid) but a get a MVEL error
as it takes 'containsKey' as a property.

Please help. Thank you.

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