h2gis
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orbisgis
Raster datatype refactoring
In order to not break H2 with Android, the Raster data type proposed to support georeferenced image must be refactored.
- The Raster type must be specified by a set of interfaces
- ImageIO driver must be added via OSGI
See https://github.com/h2database/h2database/pull/945
Is it technically possible to satisfy the Android compatibility requested by the H2 team? @nicolas-f
With a complete rewrite of H2 raster it would be possible. But reading image files require additional dependency to work on both JavaVM and Android Dalvik.
So I propose : Add a raster type to H2 (with a limited set of functions) Add the others functions and drivers (file reader and writer) as an H2GIS extension.
@ebocher Actually you aren't required to provide compatibility in this functionality. It may not work without AWT, it's OK.
The problem was in introduced hard dependencies to unavailable on some platforms classes in totally unrelated code. The whole database was broken on such platforms, this is not acceptable.
This problem is not specific only to Android. Since Java 9 not all modules can be available. java.desktop module that was required by this functionality should not be strongly required by H2. It may be required by this functionality, however.
@katzyn I want to re-open this issue and plan a road map. Raster support is an import issue for spatial database and build more complex analysis. Do you have any pre-requisites, requirements, etc.? Thanks in advance.
I think existing issues with LOB storage backends need to be resolved first.
And implementation of the new data type may not have any strong references to optional Java modules.