8:34 a.m.
Hi,
We are using a lot of Dates in our application but we use a homemade
Date class for that. Therefore, we cannot use > and < provided by
Drools. I looked through the mailing list but could not find any
examples using Dates in Drools other than in the documentation. What
interested me in particular in the documentation was "If more control is
required, use the predicate constraint."
Could someone give some examples of using predicate constraint with dates?
Something I would like to do, for example, is the following :
If there is an obj1 of class A with field of type Date d1 and another
obj2 of class A with field Date d2, where d1 is before d2, obj2 should
be used to fire something.
rule XXX
when
obj : A( $date : mydate)
// do not know how to use constraint on date here.
then
// something
obj.doSomething();
end
Thanks for your input.
8:55 a.m.
The simplest way could be to have your Date expose a "Time" type member
(like java.util.Date.getTime()) that represents the number of
seconds\milliseconds etc since a given point in time ("your absolute
zero" for example; being day * month * year * H * M * s * ms). This
could then be used as a simple predicate condition:-
rule XXX
when
obj1 : A( $time : myTime)
obj2 : A( myTime < $time )
then
// something
obj.doSomething();
End
Thanks,
Mike
-----Original Message-----
From: rules-users-bounces(a)lists.jboss.org
[mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Maxime Catelin
Sent: 21 May 2007 14:34
To: Rules Users List
Subject: [rules-users] using homemade Date in Drools
Hi,
We are using a lot of Dates in our application but we use a homemade
Date class for that. Therefore, we cannot use > and < provided by
Drools. I looked through the mailing list but could not find any
examples using Dates in Drools other than in the documentation. What
interested me in particular in the documentation was "If more control is
required, use the predicate constraint."
Could someone give some examples of using predicate constraint with
dates?
Something I would like to do, for example, is the following :
If there is an obj1 of class A with field of type Date d1 and another
obj2 of class A with field Date d2, where d1 is before d2, obj2 should
be used to fire something.
rule XXX
when
obj : A( $date : mydate)
// do not know how to use constraint on date here.
then
// something
obj.doSomething();
end
Thanks for your input.
_______________________________________________
rules-users mailing list
rules-users(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users
9:46 a.m.
Thanks for your input. That seems to involve some modifications, on our
Date class and all the classes that have Date members. That's not
exactly what i thought of doing but maybe that's the only way.
What I meant was to to find a way to compare those dates eventually
using the date methods we have (isAfter() or isBefore() for exemple) and
to "keep" only the object with the latest date. So if there are several
A objects in the working memory, we will only fire the one with the
latest date.
rule XXX
when
obj : A( $date : mydate)
not A( $date.isBefore(mydate)) // does not work but that what i was thinking
then
// something
obj.doSomething();
end
Anstis, Michael (M.) a écrit :
The simplest way could be to have your Date expose a "Time"
type member
(like java.util.Date.getTime()) that represents the number of
seconds\milliseconds etc since a given point in time ("your absolute
zero" for example; being day * month * year * H * M * s * ms). This
could then be used as a simple predicate condition:-
rule XXX
when
obj1 : A( $time : myTime)
obj2 : A( myTime < $time )
then
// something
obj.doSomething();
End
Thanks,
Mike
-----Original Message-----
From: rules-users-bounces(a)lists.jboss.org
[mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Maxime Catelin
Sent: 21 May 2007 14:34
To: Rules Users List
Subject: [rules-users] using homemade Date in Drools
Hi,
We are using a lot of Dates in our application but we use a homemade
Date class for that. Therefore, we cannot use > and < provided by
Drools. I looked through the mailing list but could not find any
examples using Dates in Drools other than in the documentation. What
interested me in particular in the documentation was "If more control is
required, use the predicate constraint."
Could someone give some examples of using predicate constraint with
dates?
Something I would like to do, for example, is the following :
If there is an obj1 of class A with field of type Date d1 and another
obj2 of class A with field Date d2, where d1 is before d2, obj2 should
be used to fire something.
rule XXX
when
obj : A( $date : mydate)
// do not know how to use constraint on date here.
then
// something
obj.doSomething();
end
Thanks for your input.
_______________________________________________
rules-users mailing list
rules-users(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users
_______________________________________________
rules-users mailing list
rules-users(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users
10:13 a.m.
How about a slight modification on Mike's solution:
rule XXX
when
obj1 : A( $date1: mydate)
obj2 : A( $date2: mydate)
eval($date1.isBefore($date2))
then
// something
obj1.doSomething();
End
I think eval allows you access to the methods in your custom Date class so
you can call isBefore in there after binding $date1 and $date 2 to any
custom date objects. I still new to Drools, so this may not be correct.
Regards
Shahad
On 5/21/07, Maxime Catelin <mcatelin(a)perinfo.com> wrote:
Thanks for your input. That seems to involve some modifications, on our
Date class and all the classes that have Date members. That's not
exactly what i thought of doing but maybe that's the only way.
What I meant was to to find a way to compare those dates eventually
using the date methods we have (isAfter() or isBefore() for exemple) and
to "keep" only the object with the latest date. So if there are several
A objects in the working memory, we will only fire the one with the
latest date.
rule XXX
when
obj : A( $date : mydate)
not A( $date.isBefore(mydate)) // does not work but that what i was
thinking
then
// something
obj.doSomething();
end
Anstis, Michael (M.) a écrit :
> The simplest way could be to have your Date expose a "Time" type member
> (like java.util.Date.getTime()) that represents the number of
> seconds\milliseconds etc since a given point in time ("your absolute
> zero" for example; being day * month * year * H * M * s * ms). This
> could then be used as a simple predicate condition:-
>
> rule XXX
> when
> obj1 : A( $time : myTime)
> obj2 : A( myTime < $time )
> then
> // something
> obj.doSomething();
> End
>
> Thanks,
>
> Mike
>
> -----Original Message-----
> From: rules-users-bounces(a)lists.jboss.org
> [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Maxime Catelin
> Sent: 21 May 2007 14:34
> To: Rules Users List
> Subject: [rules-users] using homemade Date in Drools
>
> Hi,
>
> We are using a lot of Dates in our application but we use a homemade
> Date class for that. Therefore, we cannot use > and < provided by
> Drools. I looked through the mailing list but could not find any
> examples using Dates in Drools other than in the documentation. What
> interested me in particular in the documentation was "If more control is
>
> required, use the predicate constraint."
>
> Could someone give some examples of using predicate constraint with
> dates?
>
> Something I would like to do, for example, is the following :
>
> If there is an obj1 of class A with field of type Date d1 and another
> obj2 of class A with field Date d2, where d1 is before d2, obj2 should
> be used to fire something.
>
> rule XXX
> when
> obj : A( $date : mydate)
> // do not know how to use constraint on date here.
> then
> // something
> obj.doSomething();
> end
>
> Thanks for your input.
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
>
>
_______________________________________________
rules-users mailing list
rules-users(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users
10:33 a.m.
Beat me to it - work always gets in the way ;-)
I was thinking of using return value operator within a predicate though:-
rule XXX
when
obj1 : A( $date1: mydate)
obj2 : A( $date2: mydate -> ($date1.isBefore($date2)) )
then
// something
obj1.doSomething();
End
Evals should not really be used unless you really do not have any other option. They
cannot be optimissed in the RETE network and hence will run slower than predicates.
With kind regards,
Mike
________________________________
From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On
Behalf Of Shahad Ahmed
Sent: 21 May 2007 16:13
To: Rules Users List
Subject: Re: [rules-users] using homemade Date in Drools
How about a slight modification on Mike's solution:
rule XXX
when
obj1 : A( $date1: mydate)
obj2 : A( $date2: mydate)
eval($date1.isBefore($date2))
then
// something
obj1.doSomething();
End
I think eval allows you access to the methods in your custom Date class so you can call
isBefore in there after binding $date1 and $date 2 to any custom date objects. I still new
to Drools, so this may not be correct.
Regards
Shahad
On 5/21/07, Maxime Catelin <mcatelin(a)perinfo.com > wrote:
Thanks for your input. That seems to involve some modifications, on our
Date class and all the classes that have Date members. That's not
exactly what i thought of doing but maybe that's the only way.
What I meant was to to find a way to compare those dates eventually
using the date methods we have (isAfter() or isBefore() for exemple) and
to "keep" only the object with the latest date. So if there are several
A objects in the working memory, we will only fire the one with the
latest date.
rule XXX
when
obj : A( $date : mydate)
not A( $date.isBefore(mydate)) // does not work but that what i was thinking
then
// something
obj.doSomething();
end
Anstis, Michael (M.) a écrit :
The simplest way could be to have your Date expose a "Time"
type member
(like java.util.Date.getTime()) that represents the number of
seconds\milliseconds etc since a given point in time ("your absolute
zero" for example; being day * month * year * H * M * s * ms). This
could then be used as a simple predicate condition:-
rule XXX
when
obj1 : A( $time : myTime)
obj2 : A( myTime < $time )
then
// something
obj.doSomething();
End
Thanks,
Mike
-----Original Message-----
From: rules-users-bounces(a)lists.jboss.org
[mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Maxime Catelin
Sent: 21 May 2007 14:34
To: Rules Users List
Subject: [rules-users] using homemade Date in Drools
Hi,
We are using a lot of Dates in our application but we use a homemade
Date class for that. Therefore, we cannot use > and < provided by
Drools. I looked through the mailing list but could not find any
examples using Dates in Drools other than in the documentation. What
interested me in particular in the documentation was "If more control is
required, use the predicate constraint."
Could someone give some examples of using predicate constraint with
dates?
Something I would like to do, for example, is the following :
If there is an obj1 of class A with field of type Date d1 and another
obj2 of class A with field Date d2, where d1 is before d2, obj2 should
be used to fire something.
rule XXX
when
obj : A( $date : mydate)
// do not know how to use constraint on date here.
then
// something
obj.doSomething();
end
Thanks for your input.
_______________________________________________
rules-users mailing list
rules-users(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users
_______________________________________________
rules-users mailing list
rules-users(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users
_______________________________________________
rules-users mailing list
rules-users(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users
10:52 a.m.
Yes, Shahad's suggestion shall work, but answering your first question, a
predicate would be like:
rule XXX
when
obj1 : A( $date1: mydate)
obj2 : A( $date2: mydate -> ( $date1.isBefore($date2) ) )
then
// something
obj1.doSomething();
End
Remember that predicates and evals use plain java code inside it.
[]s
Edson
2007/5/21, Shahad Ahmed <shahad.ahmed2(a)gmail.com>:
How about a slight modification on Mike's solution:
rule XXX
when
obj1 : A( $date1: mydate)
obj2 : A( $date2: mydate)
eval($date1.isBefore($date2))
then
// something
obj1.doSomething();
End
I think eval allows you access to the methods in your custom Date class so
you can call isBefore in there after binding $date1 and $date 2 to any
custom date objects. I still new to Drools, so this may not be correct.
Regards
Shahad
On 5/21/07, Maxime Catelin <mcatelin(a)perinfo.com > wrote:
>
> Thanks for your input. That seems to involve some modifications, on our
> Date class and all the classes that have Date members. That's not
> exactly what i thought of doing but maybe that's the only way.
>
> What I meant was to to find a way to compare those dates eventually
> using the date methods we have (isAfter() or isBefore() for exemple) and
>
> to "keep" only the object with the latest date. So if there are several
> A objects in the working memory, we will only fire the one with the
> latest date.
>
> rule XXX
>
> when
> obj : A( $date : mydate)
> not A( $date.isBefore(mydate)) // does not work but that what i was
> thinking
> then
> // something
> obj.doSomething();
> end
>
>
>
> Anstis, Michael (M.) a écrit :
> > The simplest way could be to have your Date expose a "Time" type
> member
> > (like java.util.Date.getTime()) that represents the number of
> > seconds\milliseconds etc since a given point in time ("your absolute
> > zero" for example; being day * month * year * H * M * s * ms). This
> > could then be used as a simple predicate condition:-
> >
> > rule XXX
> > when
> > obj1 : A( $time : myTime)
> > obj2 : A( myTime < $time )
> > then
> > // something
> > obj.doSomething();
> > End
> >
> > Thanks,
> >
> > Mike
> >
> > -----Original Message-----
> > From: rules-users-bounces(a)lists.jboss.org
> > [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Maxime
> Catelin
> > Sent: 21 May 2007 14:34
> > To: Rules Users List
> > Subject: [rules-users] using homemade Date in Drools
> >
> > Hi,
> >
> > We are using a lot of Dates in our application but we use a homemade
> > Date class for that. Therefore, we cannot use > and < provided by
> > Drools. I looked through the mailing list but could not find any
> > examples using Dates in Drools other than in the documentation. What
> > interested me in particular in the documentation was "If more control
> is
> >
> > required, use the predicate constraint."
> >
> > Could someone give some examples of using predicate constraint with
> > dates?
> >
> > Something I would like to do, for example, is the following :
> >
> > If there is an obj1 of class A with field of type Date d1 and another
> > obj2 of class A with field Date d2, where d1 is before d2, obj2 should
>
> > be used to fire something.
> >
> > rule XXX
> > when
> > obj : A( $date : mydate)
> > // do not know how to use constraint on date here.
> > then
> > // something
> > obj.doSomething();
> > end
> >
> > Thanks for your input.
> > _______________________________________________
> > rules-users mailing list
> > rules-users(a)lists.jboss.org
> > https://lists.jboss.org/mailman/listinfo/rules-users
> >
> > _______________________________________________
> > rules-users mailing list
> > rules-users(a)lists.jboss.org
> > https://lists.jboss.org/mailman/listinfo/rules-users
> >
> >
> >
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
_______________________________________________
rules-users mailing list
rules-users(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users
--
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
11:10 a.m.
Thank you all for your insights. Your explanations are really helpful.
Regards.
Yes, Shahad's suggestion shall work, but answering your first
question, a predicate would be like:
rule XXX
when
obj1 : A( $date1: mydate)
obj2 : A( $date2: mydate -> ( $date1.isBefore($date2) ) )
then
// something
obj1.doSomething();
End
Remember that predicates and evals use plain java code inside it.
[]s
Edson
2007/5/21, Shahad Ahmed < shahad.ahmed2(a)gmail.com
<mailto:shahad.ahmed2@gmail.com>>:
How about a slight modification on Mike's solution:
rule XXX
when
obj1 : A( $date1: mydate)
obj2 : A( $date2: mydate)
eval($date1.isBefore($date2))
then
// something
obj1.doSomething();
End
I think eval allows you access to the methods in your custom Date
class so you can call isBefore in there after binding $date1 and
$date 2 to any custom date objects. I still new to Drools, so this
may not be correct.
Regards
Shahad
On 5/21/07, *Maxime Catelin* <mcatelin(a)perinfo.com
<mailto:mcatelin@perinfo.com>> wrote:
Thanks for your input. That seems to involve some
modifications, on our
Date class and all the classes that have Date members. That's
not
exactly what i thought of doing but maybe that's the only way.
What I meant was to to find a way to compare those dates
eventually
using the date methods we have (isAfter() or isBefore() for
exemple) and
to "keep" only the object with the latest date. So if there
are several
A objects in the working memory, we will only fire the one
with the
latest date.
rule XXX
when
obj : A( $date : mydate)
not A( $date.isBefore(mydate)) // does not work but that
what i was thinking
then
// something
obj.doSomething();
end
Anstis, Michael (M.) a écrit :
> The simplest way could be to have your Date expose a "Time"
type member
> (like java.util.Date.getTime()) that represents the number of
> seconds\milliseconds etc since a given point in time ("your
absolute
> zero" for example; being day * month * year * H * M * s *
ms). This
> could then be used as a simple predicate condition:-
>
> rule XXX
> when
> obj1 : A( $time : myTime)
> obj2 : A( myTime < $time )
> then
> // something
> obj.doSomething();
> End
>
> Thanks,
>
> Mike
>
> -----Original Message-----
> From: rules-users-bounces(a)lists.jboss.org
<mailto:rules-users-bounces@lists.jboss.org>
> [mailto:rules-users-bounces@lists.jboss.org
<mailto:rules-users-bounces@lists.jboss.org> ] On Behalf Of
Maxime Catelin
> Sent: 21 May 2007 14:34
> To: Rules Users List
> Subject: [rules-users] using homemade Date in Drools
>
> Hi,
>
> We are using a lot of Dates in our application but we use a
homemade
> Date class for that. Therefore, we cannot use > and <
provided by
> Drools. I looked through the mailing list but could not find
any
> examples using Dates in Drools other than in the
documentation. What
> interested me in particular in the documentation was "If more
control is
>
> required, use the predicate constraint."
>
> Could someone give some examples of using predicate
constraint with
> dates?
>
> Something I would like to do, for example, is the following :
>
> If there is an obj1 of class A with field of type Date d1 and
another
> obj2 of class A with field Date d2, where d1 is before d2,
obj2 should
> be used to fire something.
>
> rule XXX
> when
> obj : A( $date : mydate)
> // do not know how to use constraint on date here.
> then
> // something
> obj.doSomething();
> end
>
> Thanks for your input.
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org <mailto:rules-users@lists.jboss.org>
> https://lists.jboss.org/mailman/listinfo/rules-users
<https://lists.jboss.org/mailman/listinfo/rules-users>
>
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org <mailto:rules-users@lists.jboss.org>
> https://lists.jboss.org/mailman/listinfo/rules-users
<https://lists.jboss.org/mailman/listinfo/rules-users>
>
>
>
_______________________________________________
rules-users mailing list
rules-users(a)lists.jboss.org <mailto:rules-users@lists.jboss.org>
https://lists.jboss.org/mailman/listinfo/rules-users
<https://lists.jboss.org/mailman/listinfo/rules-users>
_______________________________________________
rules-users mailing list
rules-users(a)lists.jboss.org <mailto:rules-users@lists.jboss.org>
https://lists.jboss.org/mailman/listinfo/rules-users
--
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 <http://www.jboss.com>
------------------------------------------------------------------------
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https://lists.jboss.org/mailman/listinfo/rules-users
------------------------------------------------------------------------
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11:24 a.m.
Why not just make your class implement Comparable, and then it will work
with > and <.
Mark
Edson Tirelli wrote:
Yes, Shahad's suggestion shall work, but answering your first
question, a predicate would be like:
rule XXX
when
obj1 : A( $date1: mydate)
obj2 : A( $date2: mydate -> ( $date1.isBefore($date2) ) )
then
// something
obj1.doSomething();
End
Remember that predicates and evals use plain java code inside it.
[]s
Edson
2007/5/21, Shahad Ahmed < shahad.ahmed2(a)gmail.com
<mailto:shahad.ahmed2@gmail.com>>:
How about a slight modification on Mike's solution:
rule XXX
when
obj1 : A( $date1: mydate)
obj2 : A( $date2: mydate)
eval($date1.isBefore($date2))
then
// something
obj1.doSomething();
End
I think eval allows you access to the methods in your custom Date
class so you can call isBefore in there after binding $date1 and
$date 2 to any custom date objects. I still new to Drools, so this
may not be correct.
Regards
Shahad
On 5/21/07, *Maxime Catelin* <mcatelin(a)perinfo.com
<mailto:mcatelin@perinfo.com>> wrote:
Thanks for your input. That seems to involve some
modifications, on our
Date class and all the classes that have Date members. That's
not
exactly what i thought of doing but maybe that's the only way.
What I meant was to to find a way to compare those dates
eventually
using the date methods we have (isAfter() or isBefore() for
exemple) and
to "keep" only the object with the latest date. So if there
are several
A objects in the working memory, we will only fire the one
with the
latest date.
rule XXX
when
obj : A( $date : mydate)
not A( $date.isBefore(mydate)) // does not work but that
what i was thinking
then
// something
obj.doSomething();
end
Anstis, Michael (M.) a écrit :
> The simplest way could be to have your Date expose a "Time"
type member
> (like java.util.Date.getTime()) that represents the number of
> seconds\milliseconds etc since a given point in time ("your
absolute
> zero" for example; being day * month * year * H * M * s *
ms). This
> could then be used as a simple predicate condition:-
>
> rule XXX
> when
> obj1 : A( $time : myTime)
> obj2 : A( myTime < $time )
> then
> // something
> obj.doSomething();
> End
>
> Thanks,
>
> Mike
>
> -----Original Message-----
> From: rules-users-bounces(a)lists.jboss.org
<mailto:rules-users-bounces@lists.jboss.org>
> [mailto:rules-users-bounces@lists.jboss.org
<mailto:rules-users-bounces@lists.jboss.org> ] On Behalf Of
Maxime Catelin
> Sent: 21 May 2007 14:34
> To: Rules Users List
> Subject: [rules-users] using homemade Date in Drools
>
> Hi,
>
> We are using a lot of Dates in our application but we use a
homemade
> Date class for that. Therefore, we cannot use > and <
provided by
> Drools. I looked through the mailing list but could not find
any
> examples using Dates in Drools other than in the
documentation. What
> interested me in particular in the documentation was "If more
control is
>
> required, use the predicate constraint."
>
> Could someone give some examples of using predicate
constraint with
> dates?
>
> Something I would like to do, for example, is the following :
>
> If there is an obj1 of class A with field of type Date d1 and
another
> obj2 of class A with field Date d2, where d1 is before d2,
obj2 should
> be used to fire something.
>
> rule XXX
> when
> obj : A( $date : mydate)
> // do not know how to use constraint on date here.
> then
> // something
> obj.doSomething();
> end
>
> Thanks for your input.
> _______________________________________________
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Edson Tirelli
Software Engineer - JBoss Rules Core Developer
Office: +55 11 3529-6000
Mobile: +55 11 9287-5646
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2:27 a.m.
Thanks Mark, I had not thought about that. Great idea.
Mark Proctor a écrit :
Why not just make your class implement Comparable, and then it will
work with > and <.
Mark
Edson Tirelli wrote:
>
> Yes, Shahad's suggestion shall work, but answering your first
> question, a predicate would be like:
>
> rule XXX
> when
> obj1 : A( $date1: mydate)
> obj2 : A( $date2: mydate -> ( $date1.isBefore($date2) ) )
> then
> // something
> obj1.doSomething();
> End
>
> Remember that predicates and evals use plain java code inside it.
>
> []s
> Edson
>
>
> 2007/5/21, Shahad Ahmed < shahad.ahmed2(a)gmail.com
> <mailto:shahad.ahmed2@gmail.com>>:
>
> How about a slight modification on Mike's solution:
>
> rule XXX
> when
> obj1 : A( $date1: mydate)
> obj2 : A( $date2: mydate)
> eval($date1.isBefore($date2))
> then
> // something
> obj1.doSomething();
> End
>
> I think eval allows you access to the methods in your custom Date
> class so you can call isBefore in there after binding $date1 and
> $date 2 to any custom date objects. I still new to Drools, so
> this may not be correct.
>
> Regards
> Shahad
>
>
> On 5/21/07, *Maxime Catelin* <mcatelin(a)perinfo.com
> <mailto:mcatelin@perinfo.com>> wrote:
>
> Thanks for your input. That seems to involve some
> modifications, on our
> Date class and all the classes that have Date
> members. That's not
> exactly what i thought of doing but maybe that's the only way.
>
> What I meant was to to find a way to compare those dates
> eventually
> using the date methods we have (isAfter() or isBefore() for
> exemple) and
> to "keep" only the object with the latest date. So if there
> are several
> A objects in the working memory, we will only fire the one
> with the
> latest date.
>
> rule XXX
>
> when
> obj : A( $date : mydate)
> not A( $date.isBefore(mydate)) // does not work but that
> what i was thinking
> then
> // something
> obj.doSomething();
> end
>
>
>
> Anstis, Michael (M.) a écrit :
> > The simplest way could be to have your Date expose a "Time"
> type member
> > (like java.util.Date.getTime()) that represents the number of
> > seconds\milliseconds etc since a given point in time ("your
> absolute
> > zero" for example; being day * month * year * H * M * s *
> ms). This
> > could then be used as a simple predicate condition:-
> >
> > rule XXX
> > when
> > obj1 : A( $time : myTime)
> > obj2 : A( myTime < $time )
> > then
> > // something
> > obj.doSomething();
> > End
> >
> > Thanks,
> >
> > Mike
> >
> > -----Original Message-----
> > From: rules-users-bounces(a)lists.jboss.org
> <mailto:rules-users-bounces@lists.jboss.org>
> > [mailto:rules-users-bounces@lists.jboss.org
> <mailto:rules-users-bounces@lists.jboss.org> ] On Behalf Of
> Maxime Catelin
> > Sent: 21 May 2007 14:34
> > To: Rules Users List
> > Subject: [rules-users] using homemade Date in Drools
> >
> > Hi,
> >
> > We are using a lot of Dates in our application but we use a
> homemade
> > Date class for that. Therefore, we cannot use > and <
> provided by
> > Drools. I looked through the mailing list but could not
> find any
> > examples using Dates in Drools other than in the
> documentation. What
> > interested me in particular in the documentation was "If
> more control is
> >
> > required, use the predicate constraint."
> >
> > Could someone give some examples of using predicate
> constraint with
> > dates?
> >
> > Something I would like to do, for example, is the following :
> >
> > If there is an obj1 of class A with field of type Date d1
> and another
> > obj2 of class A with field Date d2, where d1 is before d2,
> obj2 should
> > be used to fire something.
> >
> > rule XXX
> > when
> > obj : A( $date : mydate)
> > // do not know how to use constraint on date here.
> > then
> > // something
> > obj.doSomething();
> > end
> >
> > Thanks for your input.
> > _______________________________________________
> > rules-users mailing list
> > rules-users(a)lists.jboss.org <mailto:rules-users@lists.jboss.org>
> > https://lists.jboss.org/mailman/listinfo/rules-users
> <https://lists.jboss.org/mailman/listinfo/rules-users>
> >
> > _______________________________________________
> > rules-users mailing list
> > rules-users(a)lists.jboss.org <mailto:rules-users@lists.jboss.org>
> > https://lists.jboss.org/mailman/listinfo/rules-users
> <https://lists.jboss.org/mailman/listinfo/rules-users>
> >
> >
> >
> _______________________________________________
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>
>
>
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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 <http://www.jboss.com>
> ------------------------------------------------------------------------
>
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> https://lists.jboss.org/mailman/listinfo/rules-users
>
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8 comments
5 participants
participants (5)
-
Anstis, Michael (M.) -
Edson Tirelli -
Mark Proctor -
Maxime Catelin -
Shahad Ahmed