[Moment-interval pattern] Mapping to code

[Pho Tek]

With reference to the UML diag available at
http://raverun.com/javaranch/moment-interval.jpg ;
I need help on mapping this to actual code.
From my understanding; the moment-interval pattern models
an event happening at a particular instance. Thus
"Performance" is the hub of the design while the other
entities are its spokes. In order to model all the relations;
I have something like this:

MarathonPerformance mp = new MarathonPerformanc();
mp.setAthlete( someAthlete );
mp.setCategory( someCategory );
mp.setGuntime( someTime );

The question: I also have entities "Race" and "Event".
An "Event" will consists of 1 or more "Race"(s). And there
will be multiple categories in a "Race". Each category
will be associated with a collection of "MarathonPerformance"(s). If "Category" aggregates the "MarathonPerformance" collection; then I still have redundant "Category" members in each "MarathonPerformance" class. What am I doing wrong here ?
Thanks
Pho

[Junilu Lacar]

One thing you don't want to do when modeling is to include details that do not pertain to the problem. So, before trying to see what you are doing wrong (if anything), it might help if we understand what you are trying to do before suggesting alternatives.

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Junilu Lacar
Sun Certified Programmer for the Java� 2 Platform