[rules-users] How to use not operator in drool.

Fri Sep 14 03:22:23 EDT 2007

Hi 

I'll try to explain the situation that Gaurav finds himself in. We're
working on this problem together and so far, we haven't been able to
crack it.

We're using drools to handle the business rules for an application. The
rules however, are not provided to us in a .drl file, rather, we get an
XLS sheet from the analysts with rules in a different grammar.

We're using ANTLR to read and parse these rules to generate the drools
rules programmatically. However, we're running into problems with NOT.

The input rules (in the non-drools business language) have a NOT
operator which works like '!' in Java. It flips the Boolean around, so
to speak. So:

NOT((some sub expression which evaluates to TRUE)) == FALSE

MVEL doesn't seem to support this. So how do we simulate it?

If it were only being used with NOT IN, we could manage, but its use is
completely arbitrary. Changes to the input rules or to the input rules
grammar have been (ha ha) ruled out.

Any help would be appreciated.

Regards,

_____________________________________________________

Arsalan Zaidi / Capgemini - India (FS SBU) / Mumbai

Technical Architect
Mobile Phone: +91 - 9892 8970 03 / www.capgemini.com
<http://www.capgemini.com/> 

Together: the Collaborative Business Experience
_____________________________________________________

________________________________

From: rules-users-bounces at lists.jboss.org
[mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Anstis,
Michael (M.)
Sent: 13 September 2007 13:31
To: Rules Users List
Subject: RE: [rules-users] How to use not operator in drool.

What dialect do your rules use?

You could also simplify the logic using DeMorgans Theorem (which might
be troublesome to accomplish programmatically)

I don't know whether your example is flawed as the brackets don't match,
but assuming you mean something like this:-

(NOT (G13.1 IN ("1","2","3") OR (G250.8 = Y)))

You can re-write this as

(G13.1NOT IN ("1","2","3") AND G250.8 != Y)

With kind regards,

Mike

________________________________

	From: rules-users-bounces at lists.jboss.org
[mailto:rules-users-bounces at lists.jboss.org] On Behalf Of JOSHI, GAURAV
	Sent: 13 September 2007 08:20
	To: Rules Users List
	Subject: RE: [rules-users] How to use not operator in drool.

	Thank's for your sugession of using "not in" instead of "not"
but my problem is that "not" can also come without "in".

	Actually I am making a generator of rule file from expression
like

	 ((NOT (ENDS WITH (G10.2, ",")))

	 ((NOT (G13.1 IN ("1","2","3"))) OR (G250.8 = Y)))

	Where G13.2, G250.8, G10.2 are variables coming from a map
inserted in working memory.

	I am accessing these variables from map.

	My rules are as follows

	This rule is working fine.

	rule "Editable_G10.3"

	when

	 ((Map( this["G10.3"] !=8))||(Map( this["G10.2"] ==19)))

	then

	System.out.println("comming
here----------------------------------------------------->");

	End

	This is not working

	rule "Mandatory_G10.3"

	when

	 (not((Map( this["G10.3"] !=8))||(Map( this["G10.2"] ==19)))) 

	Then

	System.out.println("comming
here----------------------------------------------------->");

	End

	In also tried following approaches:

	1)      eval(not((Map( this["G10.3"] !=8))||(Map( this["G10.2"]
==19)))) 

	2) eval(!((Map( this["G10.3"] !=8))||(Map( this["G10.2"]
==19)))) 

	But in both cases it is giving same error:

	org.drools.rule.InvalidRulePackage: Rule Compilation error :
[Rule name=ValidationRuleExp_G10.3, agendaGroup=MAIN, salience=0,
no-loop=false]

com/telekurs/nva/mde/fe/ak/validation/Rule_ValidationRuleExp_G10_3_0.jav
a (11:495) : Cannot use this in a static context 

com/telekurs/nva/mde/fe/ak/validation/Rule_ValidationRuleExp_G10_3_0.jav
a (11:500) : Type mismatch: cannot convert from String to int

	I am trying to find out some general concept so that I can
change just achieve the functionality of not.

	Thanks

	Gaurav 

________________________________

	From: rules-users-bounces at lists.jboss.org
[mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Edson Tirelli
	Sent: Wednesday, September 12, 2007 10:20 PM
	To: Rules Users List
	Subject: Re: [rules-users] How to use not operator in drool.

	   Remove your "eval" and use "or" instead of "||" for the OR
CE.

	   Although, I feel that this is not what you want... what you
want is simply:

	when
	    Map( this['city'] not in ( "mumbai", "delhi" ) ) 
	then
	    //...
	end

	    []s
	    Edson

	2007/9/12, Gaurav2007 <gaurav.a.joshi at capgemini.com>:

	Hi ALL,

	I am using drool4.0.1 in my application i am able to use
IN,OR,AND operator
	but i am facing problem in using not operator.

	my requirement of not operator is just like a not gate.

	the way i am using it is : 

	eval(not((Map( this["city"] !="mumbai"))||(Map( this["city"]
=="delhi"))))

	so can you please help me out to solve this problem:
	should i use not operator or some thing else in drool. 

	Thanks,

	--
	View this message in context:
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12638430
<http://www.nabble.com/How-to-use-not-operator-in-drool.-tf4430240..html
#a12638430> 
	Sent from the drools - user mailing list archive at Nabble.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 

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