Hi Adrian,
On Aug 9, 2007, at 5:51 PM, Adrian Wiesmann wrote:
> - Typed Keys: Primary keys are generated for all DataObjects and it
> would
> be possible to use typed keys while programming. (The fill method
> in the
> table module extension below could be called with a typed key
> lowering the
> possibility of coding/conversion errors.)
What is a typed key? Is it a custom Java class used for PK? If so,
you sort of can do that by mapping a meaningful PK and using an
ExtendedType to map a custom class for PK.
> - Implementation of Table Data Gateway design pattern: The process
> to load
> and persist data is managed in a typed gateway class so that it
> would be
> possible to rewrite or add "elements" of a query (think about
> filling a
> logical unmapped field on a DataObject with a subquery). I know I
> could do
> something like this with callbacks. But with callbacks I can't
> extend the
> query for a performant loading of records.
There are two more extension points in Cayenne 3.0 that may help you
to do that - custom queries and ObjectContext decorators (so you may
intercept certain queries/operation and rewrite them to your liking).
So essentially it should be possible to build what you are describing
as a complimentary module to Cayenne first, and then see if it is
worth integrating it in the core.
> And: I am currently thinking about completely remodeling DataViews.
> One
> of the ideas I have is that the UI could be built from an XML
> definition
> which is transformed into an object tree. That object tree could be
> used
> by a renderer to generate a Swing interface, an xsl-fo tree (for PDF
> generation) or HTML (for webapps). Have you ever thought about
> something
> like this?
Many people did (I even started a project called JStaple that never
took off). Not sure if anybody succeeded in building something usable
though.
Andrus
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