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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