2010/10/26 Jody Garnett <[email protected]>
> The WFS datastore does not support a query across several feature
> types in a single request. In part this is due to our feature
> collections being restricted to a single feature type.
>
Yes I recognized that a FeatureColection can only contain one
SimpeFeatureType. Could I find any utility classes to query a WFSServer and
get a Map SimpleFeatureTypes as keys and FeatureCollection as values? Or
with other words, how can I get access to as WFS Server without using
creating a DataStore. I guess there are Response classes which can handle
mixed results of types.
If not, could that be a feature anybody else could need? Does anybody have
use case to requests queries like the geoserver demo-MulitFeature request?
Who had created the demo-request?
There should be way to refer to the default geometry with a simple
> xpath expression that works for all features; not sure if it applys to
> WFS or only to the SLD rendering engine.
>
Could you give an example. I've no clue how to define a xpath expression ...
Thanks
Frank
> Jody
>
> On Tue, Oct 26, 2010 at 5:14 PM, Roy Braam <[email protected]> wrote:
> > Hi Frank,
> >
> > Yep it's a work around for if you want to use the BBOX param.... Hmmmzzz,
> > actually I never used the BBOX param with geotools... It can only be used
> > with a http-get command... I don't think it's supported in the WFS
> > module.... Maybe someone else knows something about it?
> >
> > Met vriendelijke groet,
> >
> > Roy Braam
> > B3partners BV
> > 030 214 2082
> >
> > ________________________________
> > From: Frank Gasdorf [mailto:[email protected]]
> > To: Roy Braam [mailto:[email protected]],
> > [email protected]
> > Sent: Mon, 25 Oct 2010 17:40:07 +0200
> > Subject: Re: [Geotools-devel] How to create BBOX Filter with
> FilterFactory2
> >
> > Thanks Roy!
> >
> > This would a be possible solution -but from my point of view a
> workaround.
> > The reason of defining a "general" BBOX Filter is a single request and a
> > single response for that. I don't want to have a lot of server roundtrip
> to
> > query each layer separate.
> > Is there an other way to use the gt-wfs module to create a query like
> that.
> > There is no reason to have a dataStore because the client is not enabled
> for
> > editig features. What I'd expect is a simple featureCollection that
> > repesents the resullt of the query with the given URL (see below).
> >
> > Any hints?
> >
> > Frank
> >
> >
> > 2010/10/25 Roy Braam <[email protected]>
> >>
> >> Hello Frank,
> >>
> >> When using the FilterFactory you are creating a filter and that's not
> the
> >> same as the param BBOX. See the ogc wfs specs 1.1.0 chapter 14.3.3.
> >>
> >> If you like to query with a bbox filter then you have to specify the
> >> geometry attribute name.
> >> So you can do something like this: (i added the code in you code
> snippet)
> >>
> >> for(String typeName; typeNames){
> >> SimpleFeatureType type=dataStore.getSchema(typeName);
> >> String geomName=type.getGeometryDescriptor().getLocalName();
> >>
> >> BBOX bbox = filterFactory.bbox(geomName, 13.35, 52.43, 13.45, 52.53,
> >> "4326"); //$NON-NLS-1$
> >> FeatureSource<SimpleFeatureType, SimpleFeature> view =
> >> dataStore.getView(new DefaultQuery(null, bbox));
> >> FeatureCollection<SimpleFeatureType, SimpleFeature> features =
> >> view.getFeatures();
> >>
> >> Iterator<SimpleFeature> iterator = features.iterator();
> >>
> >> while (iterator != null && iterator.hasNext()) {
> >> SimpleFeature next = iterator.next();
> >> SimpleFeatureType type = next.getType();
> >> System.out.println(type.getTypeName() + "\n\t" +
> >> next.getDefaultGeometry());
> >> }
> >> }
> >>
> >> I didn't tested it but it must be something like this.
> >>
> >> Roy
> >>
> >> ________________________________
> >> From: Frank Gasdorf [mailto:[email protected]]
> >> To: [email protected],
> >> [email protected],
> [email protected]
> >> Sent: Mon, 25 Oct 2010 13:34:59 +0200
> >> Subject: [Geotools-devel] How to create BBOX Filter with FilterFactory2
> >>
> >> Hallo gt- and gs- developers,
> >>
> >> Sorry for cross posting!
> >>
> >> I'm using geoserver 2.x (means 2.0.x and 2.1-beta2) and try to connect
> >> with geotools gt-wfs client to query features from different types with
> a
> >> bbox filter. This should be an alternative way to the WMS getFeature
> >> requests.
> >>
> >> I defined a query using the DEMO request on the geoserver home, the URL
> >> request looks like this:
> >>
> >>
> >>
> http://localhost:8080/geoserver/wfs?request=GetFeature&version=1.1.0&typeName=naturalEarth:ne-10m-populated-places,naturalEarth:ne-10m-admin-0-countries&BBOX=-75.102613,40.212597,-72.361859,41.512517,EPSG:4326
> >>
> >> Note: the value for typeName parameter is a comma separated list of
> >> feature type names. The result I got for this request is what I expected
> :
> >> features are returned from more than one feature type.
> >>
> >> Now I'd like to query using the filterFactory2.bbox method to define the
> >> filter. How can I create a request like described before with the GT
> API?
> >> The bbox method expects an expression or a string for geometry attribute
> >> name. How can I gain it with GT API?
> >>
> >> Any suggestions?
> >>
> >> Thanks a lot,
> >> Frank
> >>
> >> code snippet:
> >>
> >> Map<String, String> connectionParameters = new HashMap<String,
> >> String>();
> >> connectionParameters.put(
> >> "WFSDataStoreFactory:GET_CAPABILITIES_URL", connectionURL);
> >> //$NON-NLS-1$
> >> DataStore dataStore =
> >> DataStoreFinder.getDataStore(connectionParameters);
> >>
> >> String[] typeNames = dataStore.getTypeNames();
> >> FilterFactory2 filterFactory = CommonFactoryFinder
> >> .getFilterFactory2(GeoTools.getDefaultHints());
> >> // berlin 13.40 52.48
> >> String nullString = null;
> >> BBOX bbox = filterFactory.bbox(nullString, 13.35, 52.43, 13.45,
> >> 52.53, "4326"); //$NON-NLS-1$
> >> FeatureSource<SimpleFeatureType, SimpleFeature> view =
> >> dataStore.getView(new DefaultQuery(null, bbox));
> >> FeatureCollection<SimpleFeatureType, SimpleFeature> features =
> >> view.getFeatures();
> >>
> >> Iterator<SimpleFeature> iterator = features.iterator();
> >>
> >> while (iterator != null && iterator.hasNext()) {
> >> SimpleFeature next = iterator.next();
> >> SimpleFeatureType type = next.getType();
> >> System.out.println(type.getTypeName() + "\n\t" +
> >> next.getDefaultGeometry());
> >> }
> >>
> >
> >
> >
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