locationtech / proj4j

Java port of the Proj.4 library for coordinate reprojection
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Make projection list accessible #31

Closed noberasco closed 5 years ago

noberasco commented 5 years ago

Method getProjection() in class Registry allows to obtain an instance of Projection given its name. Internally, Registry maintains an internal list of Projections names <-> classes mappings and creates an instance of the correct class.

This pull request adds a method to retrieve a complete list of all usable Projection instances.

NOTE: if you run the code you will discover that there are 3 projections configured in Registry that cannot be allocated:

They should probably be commented out in initialize() until they are property implemented (they point to class Projection, which is abstract and cannot be instanced). The code in my pull request handles gracefully these non-instanceable projections.