I should be able to help... what are you trying to do?
to use a predefined type that is storable in the datastore (http://
code.google.com/appengine/docs/java/datastore/
dataclasses.html#Core_Value_Types)
all you do is cast that property so..
Entity entity = new Entity("myKind");
Email myEmail = new Email("g...@email.com");
entity.setProperty("emailProperty", myEmail);
Key key = datastore.put(entity);
to get it back just cast it
Entity storedEntity = datastore.get(key);
Email storedEmail = (Email) storedEntity.getProperty("emailProperty");
they also appear to implement Comparable interface, so you can compare
these things...
is there anything more specific you need?
Tristan
On Apr 9, 4:31 am, Fred Janon <fja...@gmail.com> wrote:
> Hi,
>
> Are there any examples on how to use the low level data store API,
> other than the short example on the Javadoc? Especially on how to use
> the predefined types like email, GeoPt, address... Is the source code
> available for these objects? I am interested in the compare method for
> these objects.
>
> Thanks
>
> Fred
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