Ah, Yes now I understand. This is handled by ODBMS products, I know Objectivity supports this, but I'm not sure I've seen any O/R tool support polymorphic collections. There has been some talk about it on this list before. Thanks for clarifying.
-Daniel -----Original Message----- From: Charles Forsythe [mailto:forsythe@;alum.mit.edu] Sent: Wednesday, October 23, 2002 7:00 PM To: [EMAIL PROTECTED] Subject: Re: [castor-dev] Composite pattern Daniel Honig wrote: > The composite pattern describes objects that contain collections of > objects? > > Isn't this simply a 1..N relationship?......For example a book has > 1..N pages?.... Yes, but what if those pages are of different subclasses? With Castor JDO, the 1..N has to be a homogenous collection of the same class type. Composite pattern allows you to have different classes in the the 1..N relationship. Castor doesn't handle this. -- Charles ----------------------------------------------------------- If you wish to unsubscribe from this mailing, send mail to [EMAIL PROTECTED] with a subject of: unsubscribe castor-dev ----------------------------------------------------------- If you wish to unsubscribe from this mailing, send mail to [EMAIL PROTECTED] with a subject of: unsubscribe castor-dev
