[Geotools-devel] Deleting store/gridCoverageReader

[Daniele R. <dan...@ge...>]

Hi list,
I'm working on adding the capability to do a cleanup/delete of a
coverageStore/GridCoverageReader.
Suppose we have a multidimensional ImageMosaic. It's composed of some stuff
on disk (granules,  auxiliary files, property files) and a DB with records
for the coverages.

Now suppose we would like to remove the store (as an instance through REST)
and cleanup everything related to it: coverages, records in the DB,
granules on disk, auxiliary files, hidden files.
That work should be delegated to the Reader (it's the only one which has
full knowledge of the data structure) which may delegate some parts to the
underlying readers (you may think about an ImageMosaic of NetCDFs... The
ImageMosaic may delegate some cleanup to the underlying NetCDF readers
which delete hidden files and purge quick access DBs).

Therefore, I would like to know your opinion about where the "*delete*"
method should be added.

I can see 2 options:
1) StructuredGridCoverage2DReader interface: This interface already
supports createCoverage (to define new coverages), removeCoverage (to
remove a specific coverage), and harvest (to add more granules to a
coverage). It could be a good candidate to adding a delete method to
cleanup everything since it already supports "editing" methods.

2) GridCoverage2DReader interface: This interface is the one which supports
multiple coverages access. It's parent for StructuredGridCoverage2DReader.
Adding the delete method on this base class could be useful for other
readers which doesn't implement StructuredGridCoverage2DReader but which
may have the need to cleanup the store.

In both cases we will add a note to the API stating that not all the reader
are supporting it.

What do you think about it?
The outcome will be used to setup a Proposal.
Please, let me know.
Daniele



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