8:36 p.m.
I need to code a rule which checks that the begin date for an object is at
least two years ago (from todays date). Is there an easy way to code this
within Drools rule, something like:
when
Reference(fromDate > (todaysDate - 2 years))
then
<Output error>
end
Thanks in advance,
Brian Enderle
8:53 p.m.
Not at the moment, easiest way is to use a function call in a return value.
Mark
Brian Enderle wrote:
I need to code a rule which checks that the begin date for an object
is at
least two years ago (from todays date). Is there an easy way to code this
within Drools rule, something like:
when
Reference(fromDate > (todaysDate - 2 years))
then
<Output error>
end
Thanks in advance,
Brian Enderle
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4:12 a.m.
Hello Brian,
I've done something similar previously using a combination of a field
binding constraint, an eval and the excellent joda-time API
(http://joda-time.sourceforge.net/). If I remember right, you'd need
something along the lines of :
import org.joda.time.Duration;
import org.joda.time.DateTime;
Reference($fromDate : fromDate, eval(new Duration(new
DateTime($fromDate), new DateTime()).getMillis() >
(2*365*24*60*60*1000)))
It might be more readable if you can encapsulate this in a function :-)
Dean.
On 9/18/07, Brian Enderle <brianke(a)gmail.com> wrote:
I need to code a rule which checks that the begin date for an object
is at
least two years ago (from todays date). Is there an easy way to code this
within Drools rule, something like:
when
Reference(fromDate > (todaysDate - 2 years))
then
<Output error>
end
Thanks in advance,
Brian Enderle
_______________________________________________
rules-users mailing list
rules-users(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users
2:22 p.m.
Not sure if it would help, but we have gotten around some Date comparison
problems by using the getTime() method on the Date objects. Basically, it
returns time in ms since 1970 (which works fine for comparison).
I'm not sure if you can create a new Date object in the LHS of the rule. If
you can, that date is set to now. So if you do that, you should be able to
add 2 years in ms (2L * 365L * 24L * 60L * 60L * 1000L) and compare that
with your date.
If you can't create it in the LHS, you could always assert a current data
object to represent the Date either now or 2 years from now.
That being said, couldn't you do something like:
when
# $todaysDate either from asserted Date object for now, or a new Date()
if can be done
Reference(fromDate.time > ($todaysDate.time - (2L * 365L * 24L * 60L *
60L * 1000L)))
then
<Output error>
end
BrianKE wrote:
I need to code a rule which checks that the begin date for an object is at
least two years ago (from todays date). Is there an easy way to code this
within Drools rule, something like:
when
Reference(fromDate > (todaysDate - 2 years))
then
<Output error>
end
Thanks in advance,
Brian Enderle
_______________________________________________
rules-users mailing list
rules-users(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users
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4 comments
4 participants
participants (4)
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Mark Proctor -
wasabifan