[rules-users] Template rules & eval

[Wolfgang Laun]

All I can see is that the date string is the same in Periode1 and Periode2,
so you must have the same date in lines 1 and 2, which won't work well, but
is perhaps due to simplification?
-W



2010/3/10 Bertrand Grottier <b_grottier at hotmail.com>

>  Here is the "drl generated string":
>
>
> package com.tarification
> import java.util.Date ;
> import tarification.Produit ;
> import java.text.SimpleDateFormat;
>
> function Date getDate(String pStrDate)
> {
>     SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy");
>     return sdf.parse(pStrDate) ;
> }
>
> rule "Periode2"
>     when
>         $p : Produit(id == 1, eval( dDeb.before( getDate("01/06/2010") ) )
> )
>     then
>         $p.setId(2) ;
>         $p.setPrix(100) ;
>         update( $p );
> end
>
> rule "Periode1"
>     when
>         $p : Produit(id == 1, eval( dDeb.before( getDate("01/06/2010") ) )
> )
>     then
>         $p.setId(2) ;
>         $p.setPrix(50) ;
>         update( $p );
> end
>
>
> > Date: Wed, 10 Mar 2010 11:41:36 +0100
> > From: wolfgang.laun at gmail.com
> > To: rules-users at lists.jboss.org
> > Subject: Re: [rules-users] Template rules & eval
>
> >
> > Can you post the "drl generated string" you are referring to?
> > -W
> >
> > 2010/3/10 Bertrand Grottier <b_grottier at hotmail.com>:
> > > Hello,
> > >
> > > I want to use template rules. Here is my .drt file:
> > >
> > > template header
> > > ddeb
> > > dfin
> > > prix
> > >
> > > package com.tarification
> > >
> > > import java.util.Date ;
> > >
> > > import tarification.Produit ;
> > > import java.text.SimpleDateFormat;
> > >
> > > function Date getDate(String pStrDate)
> > > {
> > >     SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy");
> > >     return sdf.parse(pStrDate) ;
> > > }
> > >
> > > template "tarification_produit"
> > >
> > > rule "Periode@{row.rowNumber}"
> > >     when
> > >         $p : Produit(id == 1, eval( dDeb.before( getDate("@{ddeb}") ) )
> )
> > >     then
> > >         $p.setId(2) ;
> > >         $p.setPrix(@{prix}) ;
> > >         update( $p );
> > > end
> > > end template
> > >
> > >
> > > I modified an example provided with Drools but encounter the following
> > > exception:
> > >
> > > Exception in thread "main" org.drools.RuntimeDroolsException: Exception
> > > executing predicate
> > > com.tarification.Rule_Periode2_0Predicate0Invoker at 2110b61d
> > >     at
> > >
> org.drools.rule.PredicateConstraint.isAllowed(PredicateConstraint.java:279)
> > >     at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:143)
> > >     at
> > >
> org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:42)
> > >     at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:147)
> > >     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 tarification.TestTemplate.executeExample(TestTemplate.java:49)
> > >     at tarification.TestTemplate.main(TestTemplate.java:26)
> > > Caused by: java.lang.NullPointerException
> > >     at
> com.tarification.Rule_Periode2_0.predicate0(Rule_Periode2_0.java:9)
> > >     at
> > >
> com.tarification.Rule_Periode2_0Predicate0Invoker.evaluate(Rule_Periode2_0Predicate0Invoker.java:23)
> > >     at
> > >
> org.drools.rule.PredicateConstraint.isAllowed(PredicateConstraint.java:272)
> > >     ... 11 more
> > >
> > > I am puzzle because when I copy the drl generated string in a drl file,
> > > everything works fine.
> > >
> > > Any idea ? Thank you in advance.
> > >
> > > Regards,
> > > Benoît
> > >
> > >
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