Hi, I'll try to explain my case... I have an Object which has around 90 fields. For each of these fields, there can be unlimited validations that needs to be made. By unlimited, I mean that the user can create rules for each specific field. So not all rules are applicable to all fields. The objects I'm placing on the Map are the field structure of the 90 fields. These are things like the maxlength, mandatory/optional, alphanumeric/numeric of each field. Here is a sample code wherein I just used the Map in the then clause... ================== global java.util.HashMap recordTypeMap; global java.util.TreeMap structMap; global java.util.ArrayList structList; function CDRError setCDRError(RaCdrMoc cdr, CDRError cdrError, TreeMap structMap, String fieldName, String errorType, String editedValue, boolean autoCorrected) { cdrError = new CDRError(); cdrError.setCdrUploadId(cdr.getId().getCdruploadId()); cdrError.setCdrNo(cdr.getId().getCdrNo()); cdrError.setCdrType(0); RaCdrStructure cdrStructure = new RaCdrStructure(); cdrStructure = (RaCdrStructure) structMap.get(fieldName); cdrError.setFieldNo(cdrStructure.getId().getFieldNo()); cdrError.setErrorType(errorType); cdrError.setEditedFieldValue(editedValue); cdrError.setAutoCorrected(autoCorrected); return cdrError; } rule "MOC Check Missing Filename" when cdr : RaCdrMoc(mocflnm == ""); //this is the Object with 90 fields cdrError : CDRError(); //the resulting object that will be added to the list errorList : LinkedList(); //all errors will be placed here cdrStructure : RaCdrStructure(); then System.out.println("========No filename================"); cdr.setMocflnm("Testfile.csv"); cdrError = setCDRError(cdr, cdrError, structMap, "MOCFLNM", "01", "Testfile.csv", true); errorList.addLast(cdrError); end ========================= My other rules would require the accessing of Hashmaps from the when clause. IWould there be a need to change my data model Thanks a lot, shaz ----- Original Message ---- From: "Anstis, Michael (M.)" <manstis1(a)ford.comTo: Rules Users List <rules-users(a)lists.jboss.orgSent: Friday, November 2, 2007 5:20:38 PM Subject: RE: [rules-users] Accessing maps (hashmaps) keys and values in rules DIV { MARGIN:0px;} IMHO you should still think about putting the Map values into working memory. This would both simplify your rules and make their execution faster (eval cannot be indexed, if I remember correctly). You might need to adapt your data model representation into one that is more efficient for use in a RETE network. Can you explain your use case to help understand? Unless you have very good reason to keep the facts in the Map your life will be more difficult than it need be. An "eval" returns a boolean indiciating whether the "pattern" matched and therefore, whilst you can reference other bound LHS facts, you cannot bind other objects to variables. Thanks, Mike From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of shaz Sent: 02 November 2007 02:32 To: Rules Users List Subject: Re: [rules-users] Accessing maps (hashmaps) keys and values in rules Hi, I am placing objects in the Hashmap that were retrieved from the database. There are currently a hundred objects that I'm storing in the HashMap. I just made a simple example earlier :) . What works for me now is putting the getting of the values in the eval(). However, I don't know how to assign the values that I've taken from the Map. eval( ( (MyClass)mapOfObj.get("keyOfObj")).getId() > 30); How do I assign (MyClass)mapOfObj.get("keyOfObj") to a variable? tnx, shaz ----- Original Message ---- From: "Anstis, Michael (M.)" <manstis1(a)ford.comTo: Rules Users List <rules-users(a)lists.jboss.orgSent: Friday, November 2, 2007 12:17:51 AM Subject: RE: [rules-users] Accessing maps (hashmaps) keys and values in rules By way of example (if you misunderstand how the rule engine should be used):- rule chkobj when $o : MyClass( id == "1", name == "name" ) then //Do something else $o.doSomething(); end From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Edson Tirelli Sent: 01 November 2007 15:48 To: Rules Users List Subject: Re: [rules-users] Accessing maps (hashmaps) keys and values in rules Shaz, We strongly advise you to move to 4.0.3, but this is not related to your problem. I think you are misunderstanding something. Why are you using the global map to store your fact? Simply insert it into the working memory and it will work fine. []s Edson 2007/11/1, Shaz Tumulak <shauii(a)yahoo.com&gt;: Hi, I can't seem to make this syntax work in Drools 4.0.2. Pls. see my sample code below. ________________________________________ class MyClass { String id; String name; MyClass(String id, String name){ this.id = id; this.name = name; } : getter, setter methods : } MyClass obj = new MyClass("1"", "name"); TreeMap<String, MyClass mapOfObj = new TreeMap<String, MyClass>(); mapOfObj.put("keyOfObj", obj); ________________________________________ DRL file ------- global java.util.TreeMap mapOfObj; rule chkobj when obj : MyClass(mapOfObj["keyOfObj"].id == "1"); eval(obj.getName() == "name"); ________________________________________ I'm getting this error: org.drools.RuntimeDroolsException: java.lang.NullPointerException at org.drools.rule.EvalCondition.isAllowed(EvalCondition.java:76) Is my syntax correct and has someone used this in 4.0.2 or should I move on to Drools 4.0.3? Thanks in advance. Regards, shaz Edson Tirelli-3 wrote: you are using latest build from trunk (I'm not sure it already works syntax: address["business"].phone == "99999999" ) then > ... end converted into an inline-eval. Not as bad eval, but still more costly then using regular fields. > []s > Edson 2007/7/19, Ryan, Dennis (Dennis) <dennisryan(a)avaya.com in our rules and the only way we have found values in the Map in the "when" clauses is thru use on which I know is a big no-no by rules purists. Is there a better to deal with Maps in the when > clause? >>>> Thanks, >>> Dennis >> _______________________________________________ mailing list >> rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users >> -- - JBoss Rules Core Developer division of Red Hat @ www.jboss.com _______________________________________________ mailing list > rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users shauii(a)yahoo.com -- View this message in context: http://www.nabble.com/Accessing-maps-%28hashmaps%29-keys-and-values-in-ru... Sent from the drools - user mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users -- Edson Tirelli Software Engineer - JBoss Rules Core Developer Office: +55 11 3529-6000 Mobile: +55 11 9287-5646 JBoss, a division of Red Hat @ www.jboss.com Platonic friends of the opposite sex - the real deal? Be a better buddy Find out at Yahoo! Answers ____________________________________________________ Organic foods - just how healthy is health food? Be a better foodie Find out at Yahoo! Answers - http://ph.answers.yahoo.com/