[netcdf-java] GRIB Index File Extensions

Hello,

is there a method in the Java netCDF API for getting the file extensions
that are used for GRIB index files?  I have hard-coded those that I've
observed into my software, but every so often they change (such as the
recent ncx2 extension).  Those that I've seen semi-recently include:


   - *.gbx
   - *.gbx9
   - *.ncx
   - *.ncx2

Being able to get a String[] of index file extensions would be handy.

Thanks,

Aaron