RE: [rules-users] Rules syntax question using hashmap

Thursday, 26 February 2009

Hi,
I get the following error: Unable to resolve ObjectType 'details'

I've tried different variations (getDetails etc) but 'details is my
attribute name and doesn't seem to be picked up!

alex
-----Original Message-----
From: rules-users-bounces(a)lists.jboss.org
[mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Greg Barton
Sent: 26 February 2009 17:04
To: Rules Users List
Subject: Re: [rules-users] Rules syntax question using hashmap

Can you provide any info on why the third option doesn't work?

--- On Thu, 2/26/09, Zevenbergen, Alex <azevenbergen(a)paddypower.com&gt;
wrote:

...
 From: Zevenbergen, Alex <azevenbergen(a)paddypower.com&gt;
 Subject: [rules-users] Rules syntax question using hashmap
 To: rules-users(a)lists.jboss.org
 Date: Thursday, February 26, 2009, 10:45 AM
 Hi all, 

 Im using an object called 'Fact' this object has
 one attribute that is a
 hashmap 'details'

 I know there are several ways to access the parameters in
 the hashmap

 $f : Fact()

 eval ($f.getDetails().get("END_MATCH").toString()
 == "true" &&
 $f.getDetails().get("WINNER").toString() ==
 "HOME")

 $f : Fact(details.END_MATCH == true,details.WINNER ==
 "AWAY")

 $f : Fact()

 details(fact == $f, name == "END_MATCH", value ==
 true)

 I was told the third option works but it doesn't for
 me!

 Anyway my question is: Is there anyway for these sort of
 rules to not
 through an exception if any of the named parameters
 aren't on the
 hashmap 'details'?

 Ideally the rule would simply not fire if it looked for a
 key that
 wasn't there!

 Any info much appreciated

 Alex

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