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: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] 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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Superior, CO 80027
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Fax (303) 666-6711
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