[rules-users] Question on modeling facts

[Wolfgang Laun]

Stops would be in some ordered collection; the equals for AbstractList
is efficient enogh; it does check sizes before iterating in parallel.

Perhaps the 2 termini should be checked first (if there's a wide range
of lines), then (as Wendy proposes) the day; then the stations.

-W


2011/5/4 Wendy Mungovan <w.mungovan at yahoo.com>:
> How many train stops are you talking about?  If it is only a few it might
> not matter if you don't have the many trains.
>
> When you are writing your rule if you narrow down by matching schedule first
> and then comparing all the stops that might help.  An alternative to
> comparing two collections in drools would be to write a custom function that
> could do some simple checks first like make sure that the size of both lists
> are the same.  Another option if the list of train stops is a POJO itself is
> to make its hashkey so that two lists with the same values will have
> matching hashkeys.
>
> Wendy
>
>
> ________________________________
> From: Brett Bergquist <brett at thebergquistfamily.com>
> To: rules-users at lists.jboss.org
> Sent: Tue, May 3, 2011 3:20:52 PM
> Subject: [rules-users] Question on modeling facts
>
> I am trying to write rules to distill down a minimal train schedule from a
> set of overlapping train schedules.  A train schedule contains a train
> identifier, a schedule that it runs on, and a set of train stops.  A rule
> that I would like to write is to combine one or more train schedules if more
> than one train runs on the same day (ie has the same schedule) and stops at
> the same stops.  This ignores the train identifier and will discard all
> other train schedules that have a different train identifier but have the
> same schedule and stops.
>
> I am wondering how to model the equality test for the same set of stops.
> Can I have my Train fact contain a collection of stops and then compare the
> collections for equality?  Will this be efficient?  Is there a better way to
> model this?
>
> Any and all help will be greatly appreciated.
>
> Brett
>
>
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