Re: [castor-dev] Composite pattern

[Lanaghan, Kevin M]

Toplink will support heterogenous collections as long as the objects implement the same interface, i.e. the mapping is done on the interface.

--On Wednesday, October 23, 2002 8:50 PM -0400 Daniel Honig <[EMAIL PROTECTED]> wrote:

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

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---------------------------------------
Lanaghan, Kevin M
Vanderbilt University
Email: [EMAIL PROTECTED]

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