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@ford.com>
To: Rules Users List
<rules-users@lists.jboss.org>
Sent: 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
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@yahoo.com>:
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:
>
> Denis,
>
> If
you are using latest build from trunk (I'm not sure it already
works
> in MR3), you can use a simplified MVEL
syntax:
>
> when
> Person(
address["business"].phone == "99999999" )
>
then
> ...
>
end
>
> Although, the above will be
converted into an inline-eval. Not as bad
> as
> a top level
eval, but still more costly then using regular
fields.
>
> []s
> Edson
>
>
2007/7/19, Ryan, Dennis (Dennis) <dennisryan@avaya.com
>:
>>
>> We are using Maps (HashMaps)
in our rules and the only way we have found
>> to access keys and
values in the Map in the "when" clauses is thru use on
>> eval()
which I know is a big no-no by rules purists. Is there a better
>> way,
>> maybe some shorthand I'm not familiar with
to deal with Maps in the when
>>
clause?
>>
>>
>>
>>
Thanks,
>>
>> Dennis
>>
>>
_______________________________________________
>> rules-users
mailing list
>> rules-users@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
>
>
_______________________________________________
> rules-users
mailing list
> rules-users@lists.jboss.org
>
https://lists.jboss.org/mailman/listinfo/rules-users
>
>
shauii@yahoo.com
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--
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