9:06 a.m.
Hi Gurvinder.
Not sure where new lines have gone from your email - it makes it very hard to read!
I've also been working on a project which uses decision tables and I couldn't find
any way to use from statements either. I'm hoping to get some time within the project
to work on the drools decision table code to add some improvements, providing support for
the from clause is one of these however I'm not sure whether I will get time or not.
However I think you may be able to restructure your code so that you don't need the
from cause however I've not fully tested it. The code relies on their existing a
constructor which takes the promotion code and the equals is defined that P1.equals(P2)
when P1.code.equals(P2.code).
If you wanted to match that a promotion of a particular name exists then I think you can
use the rule
Rule "existsPromotion" when
Line(promos contains (new Promotion("HOTBUY"))) then ...
However the expression language doesn't support "not contains" which means
you have to full back to use java:
rule " contains d"
when
line : Line(eval(!line.getPromos().contains(new
Promotion("HOTBUY"))))
then
...
end
If you prefer you could also define a method on Line containsPromotionWithCode(code) which
would let you choose how to do the match.
As a spreadsheet the above would then look something like the following:
RuleTable Hotbuys
NAME
CONDITION
ACTION
l :Line
eval(!l.getPromos().contains(new Promotion("$param")))
System.out.println("$param");
Rule Name
Number Directors
Warning
example1
Hotbuys
Hotbuys missing
Hope that helps,
Thomas
From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On
Behalf Of groovenarula
Sent: 03 December 2009 06:51
To: rules-users(a)lists.jboss.org
Subject: [rules-users] Can we use 'from' CE in Decision Tables ?
Hello all, Is it possible to define the follow rule in a decision table : rule
"Activate Promotion" when l : Line( ) not ( Promotion ( code ==
"HOTBUY" ) from l.promos ) then #do some action end The rule above works
perfectly for what I need when defined in a rule file. However, when I try to define it in
a decision table so that the 'code' can be feed from a spreadsheet, I use the
following values in the rules cells : RuleTable HOTBUYS CONDITION ACTION l : Line not (
Promotion ( code == "$param" ) from l.promos ) System.out.println("$param
added"); PROMOTION PROMOTION HOTBUY BESTBUY I'm getting the following parser
errors [10,17]: [ERR 101] Line 10:17 no viable alternative at input 'Promotion' in
rule "_11" in pattern Line [10,29]: [ERR 101] Line 10:29 no viable alternative
at input 'code' in rule "_11" [10,63]: [ERR 102] Line 10:63 mismatched
input ')' expecting 'then' in rule "_11"
java.lang.IllegalArgumentException: Could not parse knowledge. at
com.sample.DecisionTableTest.readKnowledgeBase(DecisionTableTest.java:85) at
com.sample.DecisionTableTest.main(DecisionTableTest.java:28) Also in Eclipse IDE, I get
the following error : "Unknown error while parsing. This is a bug. Please contact the
Development team." NewPromotions.xls Is it possible to use 'from' conditional
element in decision tables ? If so, what am I doing wrong. If not, then what's the
best approach to implement the rule above in a decision table. I'm running Drools
5.1.0M1 in Eclipse. Help truly appreciated. Gurvinder
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