Emmanuel SÉGUIN http://fr.linkedin.com/in/emmanuelseguin/ ______________________________________________________________ Responsable adjoint de l'incubateur Direction des Services et du Système d'Information T + 33(0)1 43 98 83 54 ● M +33(0)6 81 97 36 59 Institut National de l'Information Géographique et Forestière 73, AVENUE DE PARIS, 94165 SAINT-MANDE ign.fr - geoportail.gouv.fr
________________________________________ From: Jody Garnett [jody.garn...@gmail.com] Sent: 12 August 2015 18:19 To: Emmanuel Seguin Cc: geotools-gt2-users@lists.sourceforge.net Subject: Re: [Geotools-gt2-users] WFSDataStore too slow for my use In uDig we cached the capabilities document on disk locally - for WFS or WMS cannot remember which, in order to quickly reconnect. The WFS protocol does expect clients to do version negotiation, retrieve a capabilities document, describe feature type and then get features. There have been requests for WFS protocol to get a bit smarter (offer paging or a filter parameter when connecting) but I have not looked if any of them made it into the WFS 2.0 specification. I guess if you really control both server and client short cut the datastore the GML parsers are available and you can issue your GetFeatureRequest by hand. Thanx jody, Is there an example available somewhere on how to use the GetFeatureRequest element directly ? Thanx in advance -- Jody Garnett On 12 August 2015 at 05:12, Emmanuel Seguin <emmanuel.seg...@ign.fr<mailto:emmanuel.seg...@ign.fr>> wrote: Hi, I'm writing a little program in which I will be querying objects from a WFS as part of a bigger process. I'm using the WFSDataStoreFactory to create a WFSDataStore => Trouble is the creation of the WFSDataStore seems to mean getcapabilities download and parsing, something I don't really need given the fact I already know the typename and the request parameters I want to use. The getcapabilities I'm downloading is pretty big (~1Mb) so the program is hanging for a while before querying the features. Is there a way to bypass the use of the WFSDataStore to query directly a WFS server and get a SimpleFeatureCollection ? I'm copying below the relevant part of the code I'm currently using. Thanx in advance, // Step 1 - Connection parameters Map connectionParameters = new HashMap(); connectionParameters.put("WFSDataStoreFactory:GET_CAPABILITIES_URL",getCapabilities); connectionParameters.put("WFSDataStoreFactory:TIMEOUT", 15000); connectionParameters.put("WFSDataStoreFactory:WFS_STRATEGY", "geoserver"); // Step 2 - Get WFSDataStore WFSDataStoreFactory dsf = new WFSDataStoreFactory(); WFSDataStore data = dsf.createDataStore(connectionParameters); // Step 3 - Get SimpleFeatureSource String typeName = "myTypeName"; SimpleFeatureSource source = data.getFeatureSource( typeName ); // Step 4 - Create intersects filter FilterFactory2 ff = CommonFactoryFinder.getFilterFactory2(GeoTools.getDefaultHints()); ReferencedEnvelope clipEnv = new ReferencedEnvelope(xmin, xmax, ymin, ymax, _crs); Polygon clipPolygon = JTS.toGeometry(clipEnv); Intersects filter = ff.intersects(ff.property("geom"),ff.literal(clipPolygon)); // Step 5 - Grab data SimpleFeatureCollection features = source.getFeatures(filter); ------------------------------------------------------------------------------ _______________________________________________ GeoTools-GT2-Users mailing list GeoTools-GT2-Users@lists.sourceforge.net<mailto:GeoTools-GT2-Users@lists.sourceforge.net> https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users ------------------------------------------------------------------------------ _______________________________________________ GeoTools-GT2-Users mailing list GeoTools-GT2-Users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users
