Dear devs, we would like to make an improvement for OL Filter, that would add the possibility to create Geoserver vendor ogc:Function filter elements inside existing spatial filter elements.
As you probably already know, GS has quite a lot of these handy functions by now, so it would be also useful to have them available in OL ( http://docs.geoserver.org/2.0.x/en/user/filter/function_reference.html ) Recently GS filter was improved by GeoSolutions with even more advanced filter options that enable us to make advanced queries that combine different layers on Geoserver (you can read more about it on http://geo-solutions.blogspot.com/2011/02/developer-corner-cross-layer-filtering.html) I made some initial patch that achieves desired behavior, and I opened ticket for it (http://trac.osgeo.org/openlayers/ticket/3053) As I see it now, spatial filter elements accept several arguments: type , property, value (Geometry or BBOX), distance and distance units. With this patch it will be possible to define additional elements functionName and functionParams, which would be used instead of filter.value element to create necessary Function elements. In OpenLayers.Format.Filter.v1 additional writers Function elements was added. For each Function element two parameters have to be set: string functionName and array functionParams. functionParams can contain various number of parameters - Literals, or another Function elements, allowing us to create complex filters with nested Function elements. In OpenLayers.Format.Filter.v1_0_0 and OpenLayers.Format.Filter.v1_1_1 writeSpatial function check was added that looks if functionName was supplied instead of value, and writes function node for us. (OpenLayers.Filter.Spatial needs to be modified I guess also to add additional elements there) So, id like to hear some comments/opinions about it, if i'm heading in the right directions? Should I maybe define functionName/functionParams inside filter.value? Any suggestions are more than welcomed! Regards, Ivan -- ------------------------------------------------------- Ivan Grcic GeoSolutions S.A.S. Software Engineer Via Poggio alle Viti 1187 55054 Massarosa (LU) Italy phone: +39 0584 962313 fax: +39 0584 962313 mob: +39 328 0559267 http://www.geo-solutions.it http://geo-solutions.blogspot.com/ http://twitter.com/geosolutions_it http://www.youtube.com/user/GeoSolutionsIT ------------------------------------------------------- _______________________________________________ Dev mailing list d...@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/openlayers-dev
