Matthias Basler a écrit :
> How to query all available units (length, angle) from an authority factory.
> In particular I want all units supported by EPSG.
> I have never been able to retrieve linear and angular units separately, but
> with GeoTools 2.3 the following worked:
> CSAuthorityFactory csFactory = ...
> Set<String> codes = csFactory.getAuthorityCodes(Unit.class);
> Now this method requires the interface "IdentifiedObject", which is not
> supported by the Unit class.
You can still uses the above code by cheating with Java 5 generic type:
Set<String> codes = csFactory.getAuthorityCodes((Class) Unit.class);
You will get "unchecked cast" compiler warning, this is a deprecated practice,
etc., but it will work for now.
We have no undeprecated methods for fetching the units at this time. The main
reason is that the unit system is a totally independant library that we can't
retrofit in the "IdentifiedObject" hierarchy. An other reason (maybe not a
valid
one) is that in current GeoTools implementation, the list of units that are
really supported is hard-coded anyway.
Martin
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