From: Zevenbergen, Alex <azevenbergen(a)paddypower.com&gt; Subject: RE: [rules-users] Rules syntax question using hashmap To: greg_barton(a)yahoo.com Date: Thursday, February 26, 2009, 11:30 AM So that doesn't solve the problem of null params in the hashmap? Do you know if it is possible? Also is there a good place for rules documentation and examples as all the examples I can find are fairly simply and one-dimensional -----Original Message----- From: Greg Barton [mailto:greg_barton@yahoo.com] Sent: 26 February 2009 17:26 To: Zevenbergen, Alex Subject: RE: [rules-users] Rules syntax question using hashmap Ah. That's because drools is expecting "details" to be an object type. Rule conditions take the following form: ObjectType(property == value, anotherProperty > anotherValue, ...) So, for a condition like this... details(fact == $f, name == "END_MATCH", value == true) ...you would need a class definition like this: class details { Fact fact; String name; boolean value; } And an object of type "details" would need to be inserted into working memory for the condition to possibly match. --- On Thu, 2/26/09, Zevenbergen, Alex <azevenbergen(a)paddypower.com&gt; wrote: > From: Zevenbergen, Alex <azevenbergen(a)paddypower.com&gt; > Subject: RE: [rules-users] Rules syntax question using hashmap > To: greg_barton(a)yahoo.com, "Rules Users List" <rules-users(a)lists.jboss.org&gt; > Date: Thursday, February 26, 2009, 11:14 AM > 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 > > > > > > > > > > > ________________________________________________________________________ > > Privileged, confidential and/or copyright information > may > > be contained in this communication. 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