[rules-users] Map using from constraint

[Mark Proctor]

Paul Ryan wrote:
>
> Hi all,
>
>  
>
> Is there a way using the 'from' constraint to get the values of a 
> map(the implementations of java.lang.Map eg HashMap, TreeMap, etc) 
> into a constraint parameter, and if so can someone please give an 
> example. Below is the way I've been trying, without success, to get a 
> value based on a key.
>
$m : Map()
MyObject(.....) from $m['key']

We support MVEL notation for the 'from' keyword.
>
>  
>
> import my.package.MyFact
>
> import java.util.Map.Entry
>
> rule "Find with map"
>
>                 when
>
>                                 $fact : MyFact($paramMap : paramMap)
>
>                                 $myValue : Entry(key == "mykey1") from 
> $paramMap
>
>                 Then
>
> // Sudo code...
>
>                                 <use $myValue.getValue()>
>
> end
>
>  
>
> *Paul Ryan*
>
> *Software Architect
> Product Engineering**
> **InfoTrust Group, Inc.*
>
>  
>
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