disabling and enabling a customizer

[Vamsee Lakamsani]

I used Shaun's blog tip to filter an association using a customizer (thanks Shaun).
http://onpersistence.blogspot.com/2008/01/customizing-eclipselink-jpaorm.html

As the next step I want to enable and disable this customizer programmatically. The use case is the following:

• three entities: Schedule, ScheduleVersion and Event
• Schedule has many ScheduleVersion(s) and each ScheduleVersion has many Event(s).
• When I query for a Schedule, I only want to see the latest version of the Event list (filtering customizer works great here).
• When I delete a Schedule, sometimes I want to delete just the latest version and sometimes all the versions (here I was thinking may be disable the customizer and reload/delete the Schedule and re-enable the customizer programmatically).

Is there another way?

thanks.

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[James Sutherland]

I would not recommend dynamically changing mappings.

Either handle the functionality in your application/data access layer, or perhaps use Descriptor events.

Vamsee Lakamsani wrote:

I used Shaun's blog tip to filter an association using a customizer (thanks
Shaun).
http://onpersistence.blogspot.com/2008/01/customizing-eclipselink-jpaorm.html

As the next step I want to enable and disable this customizer
programmatically. The use case is the following:

   - three entities: Schedule, ScheduleVersion and Event
   - Schedule has many ScheduleVersion(s) and each ScheduleVersion has many
   Event(s).
   - When I query for a Schedule, I only want to see the latest version of
   the Event list (filtering customizer works great here).
   - When I delete a Schedule, sometimes I want to delete just the latest
   version and sometimes all the versions (here I was thinking may be disable
   the customizer and reload/delete the Schedule and re-enable the customizer
   programmatically).

Is there another way?

thanks