Hi list,
The current implementation status of the GridCoveargeReader normally
associates a single reader with a single coverage (e.g., TIFF, GTOPO30, and
so on).
It would be great to break the 1-1 association and allow GridCoverageReader
to expose multiple covearges in an efficient way, in order to properly deal
with sources storing multiple coverages with different structures and
features (e.g., not mosaics, which can deal with multiple coverages having
some degree of uniformity).
The current *GridCoverageReader* interface already allows to expose
multiple coverages, but in an inefficient and thread unsafe way, as it is
intended to (quoting from the current JAVADOC)* "read GridCoverages from
the input stream in a sequential order*".
No form of random access support is available right now.
Therefore, we propose to change that API in order to deprecate methods
related to the current sequential access paradigm like "skip",
"hasMoreGridCoverages", "getCurrentSubname" and add a few of them which
allows "random acces" by name.
Moreover, we propose also to add a new *GridCoverage2DReader* interface
collecting common methods from *AbstractGridCoverage2DReader* which is the
base class implementation.
As the API changes proposal requires, I'm pasting here the JIRA link as
well as the proposal page which contains more detailed information on the
topic, methods change proposal and interfaces related to that.
https://jira.codehaus.org/browse/GEOT-4424
http://docs.codehaus.org/display/GEOTOOLS/Efficient+support+for+multiple+coverages+in+GridCoverageReader
Cheers,
Daniele
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