[rules-users] Comparing Date with || OR operator

Wed Feb 24 18:15:36 EST 2010

Guys,

I don’t know if there is a bug in Drools while comparing Date attributes. I am
trying different things. Another finding is the following code works.

Membership ( $regDate : regDate) 

Segment ( startDate < $regDate || startDate.time > endDate.time ) 

It solves my problem but makes code bit ugly and lengthy.

Date: Wed, 24 Feb 2010 07:43:04 -0800
From: ml-node+413210-578640977-80541 at n3.nabble.com
To: sdhari at hotmail.com
Subject: Re: Comparing Date with || OR operator

I just read you condition. You are building $endDate to

Segment.endDate and than comparing Segment.startDate with $endDate

what is same as comparing Segment.startDate with Segment.endDate ->

transition principle.

Pavel

2010/2/24 Shabbir Dhari <[hidden email]>:

> Hi Pavel

>

> I really don’t understand what do you mean. I guess you didn’t read complete

> thread carefully. Assigning endDate attribute in a variable and not using

> that variable in condition make no sense to me.

>

> Shabbir

>

>

>

>> Date: Wed, 24 Feb 2010 10:54:24 +0100

>> From: [hidden email]

>> To: [hidden email]

>> Subject: Re: [rules-users] Comparing Date with || OR operator

>>

>> What about:

>>     Membership ( $regDate : regDate)

>>     Segment ($endDate : endDate, startDate < $regDate || startDate >

>> endDate )

>>

>> Logically startDate > endDate doesn't make sense but it should work ;-)

>>

>> Pavel

>>

>> 2010/2/24 Shabbir Dhari <[hidden email]>:

>> > I tried with some thing different and it worked but I don’t want this as

>> > I

>> > have many collections in my data structure.

>> >

>> >     //this works

>> >     Membership ( $regDate : regDate)

>> >     Segment ( $endDate : endDate )

>> >     Segment ( startDate < $regDate || startDate > $endDate )

>> >

>> >     //this does NOT work

>> >     Membership ( $regDate : regDate)

>> >     Segment ($endDate : endDate, startDate < $regDate || startDate >

>> > $endDate )

>> >

>> > ________________________________

>> > From: [hidden email]

>> > To: [hidden email]

>> > Date: Tue, 23 Feb 2010 23:09:50 +0000

>> > Subject: Re: [rules-users] Comparing Date with || OR operator

>> >

>> > Segment ( $endDate : endDate, startDate < $regDate || startDate >

>> > $endDate )

>> > even does not work. I am using verstion 5.0.1. All dates are

>> > java.util.Date

>> > and values in sample fact are:

>> >

>> > regDate = Fri Aug 01 00:00:00 BST 2008

>> > startDate =  Tue Sep 01 00:00:00 BST 2009

>> > endDate = Fri Jul 30 00:00:00 BST 2010

>> >

>> > Stack trace:

>> >

>> > java.lang.NullPointerException

>> >     at org.drools.reteoo.LeftTuple.get(LeftTuple.java:265)

>> >     at org.drools.reteoo.LeftTuple.get(LeftTuple.java:300)

>> >     at

>> >

>> > org.drools.rule.VariableRestriction$ObjectVariableContextEntry.updateFromTuple(VariableRestriction.java:320)

>> >     at

>> >

>> > org.drools.rule.AbstractCompositeConstraint$MultiFieldConstraintContextEntry.updateFromTuple(AbstractCompositeConstraint.java:305)

>> >     at

>> >

>> > org.drools.common.SingleBetaConstraints.updateFromTuple(SingleBetaConstraints.java:119)

>> >     at org.drools.reteoo.JoinNode.assertLeftTuple(JoinNode.java:109)

>> >     at

>> >

>> > org.drools.reteoo.SingleLeftTupleSinkAdapter.doPropagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:117)

>> >     at

>> >

>> > org.drools.reteoo.SingleLeftTupleSinkAdapter.createAndPropagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:78)

>> >     at

>> >

>> > org.drools.reteoo.LeftInputAdapterNode.assertObject(LeftInputAdapterNode.java:142)

>> >     at

>> >

>> > org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:42)

>> >     at

>> > org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:185)

>> >     at

>> > org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:146)

>> >     at

>> >

>> > org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1046)

>> >     at

>> >

>> > org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1001)

>> >     at

>> >

>> > org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:788)

>> >     at

>> >

>> > org.drools.reteoo.ReteooStatelessSession.execute(ReteooStatelessSession.java:192)

>> >     at

>> >

>> > au.gov.nsw.osr.zena.rules.AnnualRulesTester.main(AnnualRulesTester.java:57)

>> >

>> >

>> >> Date: Tue, 23 Feb 2010 12:54:46 +0100

>> >> From: [hidden email]

>> >> To: [hidden email]

>> >> Subject: Re: [rules-users] Comparing Date with || OR operator

>> >>

>> >> Please try this rewrite of the 2nd CE:

>> >> Segment ( $endDate : endDate, startDate < $regDate || startDate >

>> >> $endDate

>> >> )

>> >> and report the outcome to the list, together with the Dools version

>> >> you are using.

>> >> Thank you.

>> >>

>> >>

>> >> 2010/2/23 dhari <[hidden email]>:

>> >> > Hi Thomas

>> >> >

>> >> > Thanks your prompt reply. I am sure all three attributes are NOT

>> >> > null. I

>> >> > have tested them before sending question to mailing list. If you

>> >> > want,

>> >> > I can

>> >> > send complete sample code and you can try it at your end.

>> >> >

>> >> > Regards,

>> >> > Dhari

>> >> >

>> >> >

>> >> > ________________________________

>> >> > Date: Tue, 23 Feb 2010 02:50:08 -0800

>> >> > From: [hidden email]

>> >> > To: [hidden email]

>> >> > Subject: Re: Comparing Date with || OR operator

>> >> >

>> >> > If it works fine with an and operator then I’d imagine that startDate

>> >> > <

>> >> > $regDate returns false, with an && this would abort evaluation

>> >> > immediately

>> >> > but with an or it would mean that startDate > endDate is evaluated

>> >> > and

>> >> > so

>> >> > presumably it is this bit that is throwing the NPE.  I’d imagine that

>> >> > the

>> >> > most likely reason for this would be that endDate is null.

>> >> >

>> >> >

>> >> >

>> >> > Try changing it too

>> >> >

>> >> > Segment ( startDate < $regDate || (endDate != null && startDate >

>> >> > endDate) )

>> >> >

>> >> > And see whether you loose the NPE.

>> >> >

>> >> >

>> >> >

>> >> > Thomas

>> >> >

>> >> >

>> >> >

>> >> > From: [hidden email] [mailto:[hidden email]] On Behalf Of dhari

>> >> > Sent: 23 February 2010 06:15

>> >> > To: [hidden email]

>> >> > Subject: [rules-users] Comparing Date with || OR operator

>> >> >

>> >> >

>> >> >

>> >> > The following code generates NPE in ReteTuple.java

>> >> >

>> >> > rule

>> >> >

>> >> >        when

>> >> >

>> >> >               Membership ( $regDate : regDate)

>> >> >

>> >> >               Segment ( startDate < $regDate || startDate > endDate )

>> >> >

>> >> >         then

>> >> >

>> >> >             System.err.print(“Invalid start date”);

>> >> >

>> >> > end

>> >> >

>> >> > I am new in Drools and don’t know much about DRL scripting. It works

>> >> > fine I

>> >> > use && operator instead.

>> >> >

>> >> > ________________________________

>> >> >

>> >> > View this message in context: Comparing Date with || OR operator

>> >> > Sent from the Drools - User mailing list archive at Nabble.com.

>> >> >

>> >> > ________________________________

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>> >> > View this message in context: RE: Comparing Date with || OR operator

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