> Feature - An in memory representation of user's data, which can have > geometry and attribution. Question: can we use the Feature concept for > data without geometry or should Feature be a subtype of a DataObject > interface that has the same interface but without the > Geometry methods. If I remember well enough a "Feature", as "Standards" sees it, can have zero or more geometric attributes.
Probably there're many spots inside existing OJ code where it's assumed a Geometric attributes exists and it's not null (and maybe it's also assumed there is only _one_ geometric attributes). If all these assumptions could be removed it would be very good for code robustness. I think that robust support for non-geometric and multi-geometric and null-geometric Features would be a great bonus for OJ users. Bye Paolo Rizzi > -----Messaggio originale----- > Da: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] > conto di Paul > Austin > Inviato: mercoledì 13 giugno 2007 15.43 > A: JUMP Developer > Oggetto: [JPP-Devel] JUMP Concepts > > > A comment that SS made regarding Layers vs. FeatureSchema objects made > me think that we probably need a Wiki page where we can define the > concepts and purpose of these concepts within OpenJUMP before we start > changing around anything to do with the feature model, schema etc. So > I've put together a list below of some of these concepts and my > understanding of these. These are quick notes and would need > to be word > smithed. > > User Facing concepts: > > Project - A user defined grouping of data that they wish to > work on for > a specific task. > Category - Visual Grouping of layerables in a Project > Layerable - A visual item that can be displayed on the > Projects viewport > Layer - A vector based Layerable used to render Feature > instances using > Style objects > Style - A way of changing the rendering of a feature, Color, width. > pattern, text, line decorations > LayerTheme - Currently this is a ColorThemingStyle that will render > features using different style based on attributes of a feature. The > theme also displays additional names under the layer. I think this > concept needs to be extended to allow different types of themes and to > have show/hide for the themes. Maybe a Layerable.getThemes() > that would > return a collection of LayerableTheme objects rather than the current > approach which hard codes the ColorThemingStyle > WMSLayer - A raster based Layerable loaded from a WFS Server > > Internal Concepts: > > Feature - An in memory representation of user's data, which can have > geometry and attribution. Question: can we use the Feature concept for > data without geometry or should Feature be a subtype of a DataObject > interface that has the same interface but without the > Geometry methods. > FeatureSchema - Provides the names and types of the > attributes on a Schema > > DataStore - A connection to a store of feature and attribute > only data. > Examples would be File, ZipFile, Postgis database connection, Oracle > database connection. A DataStore can contain many data sets. > DataSource - A connection typically to a source of data that > contains a > single type of feature for example a Shape file > ConnectionManager - Saved list of previous database connections > > I'm sure I missed a whole bunch of concepts but this should > be enough to > start discussion. > > Paul > > > -------------------------------------------------------------- > ----------- > This SF.net email is sponsored by DB2 Express > Download DB2 Express C - the FREE version of DB2 express and take > control of your XML. No limits. Just data. Click to get it now. > http://sourceforge.net/powerbar/db2/ > _______________________________________________ > Jump-pilot-devel mailing list > Jump-pilot-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel > ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ Jump-pilot-devel mailing list Jump-pilot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel
