Jody Garnett a écrit :
> Hi Martin ! Great news - epsg-oracle is now working for me.
Nice :)
> I confess I still get a bit confused watching this code turn over in a
> debugger ...
I admit that factories in the referencing modules have a lot of indirection
levels, which make it hard to follow with a debugger.
The old (two-years ago) CTS implementation had fewer indirections. But it has
been critized that some classes were mixing different jobs. For example Andrea
rightly pointed out that 1) reading the database and 2) buffering (or caching)
should be handled by different classes, exactly like java.io.FileReader vs
java.io.BufferedReader. Of course he was right and I fully agree with him. The
new CRS framework does that, but the price to paid is indirection levels between
EPSG FactoryUsingSQL and BufferedAuthorityFactory. So we have:
FactoryUsingSQL - for reading the EPSG database
BufferedAuthorityFactory - for caching
OrderedAxisAuthorityFactory - for changing axis order to (x,y)
AllAuthorityFactories - for querying all authorities (EPSG, AUTO2...)
with the additional complication that a BufferedAuthorityFactory instance may be
inserted in more than one place (at different steps), all this stuff result in a
lot of indirections...
Martin
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