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https://issues.apache.org/jira/browse/SIS-337?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15840132#comment-15840132
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Martin Desruisseaux commented on SIS-337:
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In order to try to address the need better, I would like to know: for
applications that need an embedded EPSG database, is there a need for the full
EPSG database or do such applications typically know in advance the EPSG codes
they are interested on?
I was wondering if it would be useful to have a mechanism like that (the
{{@PrefetchCRS}} annotation does not exist yet - this part of the proposal for
which I would like to evaluate the interest):
{code:java}
@PrefetchCRS("EPSG:3395")
CoordinateReferenceSystem myCRS;
{code}
An annotation processing tool provided by Apache SIS would inject automatically
the necessary code for initializing {{myCRS}} to the EPSG:3395 Coordinate
Reference System. The developer would need the EPSG database at build time, but
not at runtime; the CRS definition would be copied for example using Java
object serialization. If there is any {{CoordinateOperation}} explicitly
defined in the EPSG database for some pair of CRS declared in different
{{@PrefetchCRS}} annotation, they would also be copied.
Of course this approach would be useful only if an application is interest in a
relatively small set of CRS known at build time.
> Package EPSG Derby DB in sis-epsg jar, eliminating the need for external
> SIS_DATA dir
> --------------------------------------------------------------------------------------
>
> Key: SIS-337
> URL: https://issues.apache.org/jira/browse/SIS-337
> Project: Spatial Information Systems
> Issue Type: Wish
> Components: Referencing
> Affects Versions: 0.7
> Reporter: Kevin Mehall
>
> Since [Derby
> supports|https://db.apache.org/derby/docs/10.7/devguide/cdevdeploy11201.html]
> read-only databases in .jar files, is there a reason that the
> `org.apache.sis.non-free:sis-epsg` package includes SQL source to create an
> external database, rather than the database itself?
> It would make deployment much easier if there were no need for a SIS_DATA
> directory and environment variable, and adding the dependency were the only
> thing necessary.
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