Re: [rules-users] Weblogic rules to Drools rules.
Glad to hear things are moving forward!
How do you feel about writing a quick tutorial on how to implement a
custom evaluator so that others can benefit from your experience? :) We
could post it on the blog and add to the manual with the proper credits.
Regarding your question, "in" is a special parser syntax sugar we have in
Drools. So:
field in ("aValue", $aVariable, Some.CONSTANT)
Is exactly the same as:
field == "aValue" || == $aVariable || == Some.CONSTANT
So, the answer is, without patching Drools, unfortunately, it is not
possible to do the same with custom evaluators. In your case, the best I can
suggest without changing Drools parser is to have your evaluator receive all
possible values as a single String:
code codeChecker "V100-V200, 243327005, 243327005"
So, your operator would just split the list and check all values there
as appropriate. Obviously, if you would like to submit a patch for Drools
allowing custom evaluators to accept multiple values, we would gladly apply
the patch to the code base and support it from that time forward.
Cheers,
Edson
2010/2/1 kashif10 <kash452(a)yahoo.com>
Thanks all of you!
We are heading toward the solution.
i) We start putting interenal data too in WM.
ii) For time period matching I simply write a method in Fact class, which
calls using the exact name matching fucntionality.
iii) For complex code matching including exact number match, Range match,
wildcard match. I created the customEvalutor, usning new operator
codeChecker, to handle all required scenarios, as follows:
exists (Diagnosis(name == "diag3" || ( code codeChecker "V100-V200"
&&
codeSystem == "2.16.840.1.113883.6.96" ) ))
Ques: I need suggestion how to use my custom Evaluator codeChecker in
following suggested OR combination using in. As you know that if we don't
use "in" then we have to add so many ORed patterns.
exists (Diagnosis(name in ( "Vibrio abc splendidus" , "kash")
|| (
code in
( "243327005", "243327005") && codeSystem ==
"2.16.840.1.113883.6.96" ) )
)
-Kash
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Edson Tirelli
JBoss Drools Core Development
JBoss by Red Hat @ www.jboss.com
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