Justine,
It shouldn't be space sensitive. Where are you inserting the space
that is giving you the error? I see your line bellow is missing a ')' in
the end, but maybe it was a mistake when you wrote the e-mail... so,
could you please clarify?
In trunk the syntax was simplified to almost what you asked for. In
trunk you can write:
rule "test"
when
valObj : MyValuesObject(a:aVal, b:bVal, c:cVal,
(a < (1/780)*(b+c)),
((b + c) > 500000) )
then
System.out.println("Alert condition met on obj:" + valObj);
end
You can break lines as you wish, but the predicates must be inside
the fact scope.
Hope it helps,
Edson.
Justine Hlista wrote:
Should predicate constraints be sensitive to whitespace?? I have the
following rule with a predicate constraint:
rule "test"
when
valObj : MyValuesObject(a:aVal, b:bVal, c:cVal ->
((a.intValue() < (1/780) * (b.intValue() + c.intValue()) &&
(b.intValue() + c.intValue()) > 500000)
then
System.out.println("Alert condition met on obj:" + valObj);
end
Inserting whitespace into the predicate results in the following
exception:
org.drools.rule.InvalidRulePackage: unknown:155:85 mismatched token:
[EMAIL PROTECTED],5226:5227='\r\n',<4>,155:85]; expecting type ')'
unknown:156:28 mismatched token: [EMAIL PROTECTED],5256:5256='(',<23>,156:28];
expecting type ')'
If instead I use an eval on the LHS, I can insert whitespace without
an exception.
In addition, I would like to know if there are any plans to simplify
the syntax for similar types of rules, as the above is extremely
unwieldy for the non-expert.
For instance, I would vastly prefer to write the following:
rule "test"
when
valObj : MyValuesObject(a:aVal, b:bVal, c:cVal)
(a < (1/780)*(b+c))
((b + c) > 500000)
then
System.out.println("Alert condition met on obj:" + valObj);
end
Also, since everything in rules needs to be an Object, is there any
plan to make the operators deal with said Objects? That is, so I do
not always have to de-reference with my eval or predicate objects with
intValue() or floatValue() or whatever?
In our application, the user (i.e. not a drools or java expert) will
be writing the rules. The current syntax requirements for encoding the
above simple rule makes me very nervous about our users ever being
able to use the rules effectively.
Thanks,
Justine
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Edson Tirelli
Software Engineer - JBoss Rules Core Developer
Office: +55 11 3124-6000
Mobile: +55 11 9218-4151
JBoss, a division of Red Hat @ www.jboss.com
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