Hi,
just an observation, checking the geopackage extensions, I see one from the
GeoPackage spec author, called "Styling and symbology extension"
and another, probably the one you're talking about, called "QGIS Map
Styling Information".
See: https://www.geopackage.org/extensions.html
They probably don't match, but if there is a single public GeoTools API
talking about gpkg styles, it should be able to eventually handle both.
I'm not saying that you have to implement them both, but a public API in
the GeoPackage classes should
be able to expose both transparently, or else be explicit and have a way to
extract QGIS styles and
"geopackage styles" in a separate way
Cheers
Andrea
On Tue, Feb 11, 2020 at 5:53 PM Henning, Mark (Peraton) (US Person) via
GeoTools-Devel <geotools-devel@lists.sourceforge.net> wrote:
> Good Morning,
>
>
>
> QGIS allows a layer’s style to be stored in a GeoPackage (or other
> database oriented solutions). It creates a table called layer_styles which
> contains metadata, the QGIS proprietary layer style information , but also
> a column which contains an SLD.
>
>
>
> I would like to add methods to the org.geotools.geopkg.GeoPackage class to
> be able to access this information.
>
> Looking at how the class is already designed, I would suggest the following
>
>
>
> A new class: StyleEntry (with appropriate getters)
>
> {
>
> Entry entry; // the entry to which the style belong
>
> String name; // the contents of the styleName column
>
> String description; // the contents of the description
> column
>
> }
>
>
>
> Then add the following methods to GeoPackage
>
>
>
> List<StyleEntry> layerStyles();
>
> Style layerStyles(StyleEntry entry);
>
>
>
> Although I would like to support adding a layer style, the layer_styles
> table stores both the SLD and QML versions of the style description, and
> until the rest of GeoTools supports QML styles that would leave the
> database row created for the new storage inconsistent with rows created
> from QGIS.
>
>
>
> If there is another way to reasonably pull this information from a
> GeoPackage, I am open to other solutions.
>
>
>
> Would this added feature be amenable to the developer community?
>
>
>
> Very respectfully,
>
>
>
> *Mark Henning*
>
> Software Engineer, Technical Specialist
>
> Nuclear Science & Engineering
>
> Office: 719-599-1519
>
> Cell: 612-703-8563
>
> [image: cid:image001.png@01D3C5CF.995E1BA0]
>
>
> _______________________________________________
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> GeoTools-Devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/geotools-devel
>
--
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