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From: Matthew Adams <matthew@matthewadams.me>
Date: Sat, 26 May 2012 07:51:12 -0500
Message-ID: 
 <CAGZB7Rhhm8y94ydgYq0TGn-ojOoyCBB0tnBaMR_0-SuttH6c-A@mail.gmail.com>
Subject: Re: OR mapping for JDO2.0
To: jdo-user@db.apache.org, Gang Liu <gangliutim@yahoo.com>
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JDO doesn't support collections of collections, maps of collections,
etc.  An easy workaround is to define a class that contains a
List<String>, like this:

public class StringList {
  List<String> list;

  // ctors, List<String> delegate methods, etc
}

Then your #1 becomes List<StringList>.  For #2, you could define

public class StringListList {
  List<StringList> list;

  // ctors, List<StringList> delegate methods, etc
}

and then use Map<StringListList,String>.

-matthew

On Fri, May 25, 2012 at 7:25 PM, Gang Liu <gangliutim@yahoo.com> wrote:
> Hi,
>
> I have 2 use cases and hope someone can give some ideas:
>
> #1 how to write mapping file if a member variable in a class is List<List<String>>
> #2. how to write mapping file if a member variable in a class is Map<List<List<String>>,String>
>
> thanks
>
> Tim



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