[rules-users] Map using from constraint

[Paul Ryan]

Sorry if this is a very basic question but does that mean that I have to set the dialect for the whole rule to MVEL. I ask because using the code below with the dialect left as default fails with an error about the square brackets. However my consequence code doesn't work with the dialect set as MVEL. All this means for me is that I will probably have to stick with my eval version of key checking but I just wanted to be sure.

import my.package.MyFact
import java.util.Map.Entry
rule "Find with map"
                when
                                $fact : MyFact($paramMap : paramMap)
                                $myValue : String() from $paramMap['mykey1']
                then
// Sudo code...
                                <use $myValue >
end


Thank you Mark for the quick reply,

-- Paul Ryan

From: rules-users-bounces at lists.jboss.org [mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Mark Proctor
Sent: Wednesday, July 16, 2008 4:29 PM
To: Rules Users List
Subject: Re: [rules-users] Map using from constraint

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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