[udig-dev] Advanced Style Editors and expected behavior with "Style List

[Frank Gasdorf <fgdrf@xxxxxxxxxxxxxxxxxxxxx>]

Hello everybody

While bugfixing UDIG-1737 I stumbled about the import/export and apply functionallity.

Resources :
* http://udig.github.io/docs/user/reference/Feature%20Style%20Pages.html#simple-polygons

* Github Pull request for 1737 : https://github.com/locationtech/udig-platform/pull/190

What I did:

* Opended a Style editor for polygon layer

* imported a style from SLD file which contains PolygonSymbolizers, PointSymbolizers and TextSymbolizers from file system

* All Styles are displayed in the list correctly

* I selected a Point-Style and hit "apply" buttond down in the midle

* I got serveral NullPointerExpections

What I expected:

* the Importer should ignore Symbolizers that cannot be applied to the current featureType

* or the apply Button should filter the Symbilizers before adding a new rule

Can somebody describe the Story behind the "Style List" Composite and the expected behavior?

I'm not sure about the behavior for follwoing Style-Elements and whats the best way to validate and handle it:

* Are filters applied as well (referenceing a property that doesn't exists for the current feature type)

* PointSymbolizers for LineStrings that have a "geometry" function such as vertices (e.g. http://docs.geoserver.org/stable/en/user/styling/sld-extensions/geometry-transformations.html#examples)

* property access of featureTypeAttributes is problematic in general because names differ between featureTypes (the_geom vs geometry vs geom)

Thanks in advance

- Frank