[jira] [Assigned] (SIS-603) Make SQLStore abstract for allowing more customization

["Martin Desruisseaux (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SIS-603?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Martin Desruisseaux reassigned SIS-603:
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> Make SQLStore abstract for allowing more customization
> ------------------------------------------------------
>
>                 Key: SIS-603
>                 URL: https://issues.apache.org/jira/browse/SIS-603
>             Project: Spatial Information Systems
>          Issue Type: Task
>          Components: Storage
>    Affects Versions: 1.4
>            Reporter: Martin Desruisseaux
>            Assignee: Martin Desruisseaux
>            Priority: Major
>             Fix For: 1.5
>
>
> {{SQLStore}} needs to be more extensible for making possible to use it as the basis of a Geopackage data store. The most important change is that the array of {{ResourceDefinitions}} (which specifies the tables, views or queries to view as {{FeatureSet}} resources) cannot be specified at construction time, because in a Geopackage file, this array is determined by the {{"gpkg_contents"}} table. It is more convenient to read this table _after_ {{SQLStore}} construction because it allows reusing an existing connection and makes some services such as {{findCRS(srid)}} or {{findSRID(crs)}} available. However, this change requires that we make {{SQLStore}} an abstract class, because the {{ResourceDefinition}} objects are now specified by an {{readResourceDefinitions()}} method that sub-classes must override.
> Another change is that the type of resources returned by {{SQLStore}} needs to be relaxed from {{FeatureSet}} to {{Resource}}.
> Another change is that a low-level access to the database is needed, for allowing subclasses such as a Geopackage store to perform their own SQL query. This is done by a new class, {{DataAccess}}.
> h1. Incompatible changes
> Above-described changes contain the above incompatible changes:
> * {{SQLStore}} class has been made abstract.
> * {{ResourceDefinitions...}} argument in {{SQLStore}} constructor has been removed.
> * {{SQLStore.components()}} and {{findResource(String)}} now return {{Resource}} instead of {{FeatureSet}}.
> All the behavior of the old {{SQLStore}} are provided by {{SimpleFeatureStore}}. If any of above incompatible changes break an existing code, replacing {{SQStore}} by {{SimpleFeatureStore}} should fix the problem in mos cases.



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