[udig-devel] creating a feature with default values

[andrea antonello]

Alright, part II:

I didn't get that right with the getFeatureType from the
featurecollection, instead I was really searching for the getSchema
method.

FeatureType featureType = selectedFeatureCollection.getSchema();
Object attributes[] = DataUtilities.defaultValues(featureType);
attributes[0] = gFac.createPoint(new Coordinate(0.0, 0.0));
featureToUse = featureType.create(attributes);

And that does what I need. I will have to investigate how the
different datastores work for this.
But now I think I will celebrate the Saturday :)

Ciao
Andrea




On Sat, May 3, 2008 at 8:56 AM, andrea antonello
<andrea.antonello at gmail.com> wrote:
> Alright, next step:
>
>  Since I tried like this and it worked perfectly:
>
>  GeometryFactory gF = new GeometryFactory();
>             GeometryAttributeType geometryAttribute =
>  (GeometryAttributeType) AttributeTypeFactory
>                     .newAttributeType("the_geom", MultiPoint.class, false, 1, gF
>                             .createMultiPoint(new Coordinate[]{new
>  Coordinate(0.0, 0.0)}));
>             AttributeType catAttribute =
>  AttributeTypeFactory.newAttributeType("cat",
>                     Integer.class, true, 1, 1);
>             AttributeType levelAttribute =
>  AttributeTypeFactory.newAttributeType("level",
>                     Float.class);
>
>             FeatureType featureType = null;
>             featureType = FeatureTypeBuilder.newFeatureType(new
>  AttributeType[]{geometryAttribute,
>                     catAttribute, levelAttribute}, "name");
>
>             AttributeType attributeType = featureType.getAttributeType(0);
>
>             System.out.println(attributeType);
>
>             Object attributes[] = DataUtilities.defaultValues(featureType);
>             Feature featureToUse = featureType.create(attributes);
>
>             System.out.println(featureToUse.getDefaultGeometry().getGeometryType());
>
>
>  I felt kind of strange, so I tried to have a look at what the
>  featuretype of a collection and a feature is:
>
>                 FeatureType featureType =
>  selectedFeatureCollection.getFeatureType();
>                 Feature next = selectedFeatureCollection.features().next();
>                 FeatureType featureType2 = next.getFeatureType();
>
>  and the are really different:
>
>  featureType:
>  DefaultFeatureType [name=AbstractFeatureCollectionType ,
>  namespace=http://www.opengis.net/gml , abstract=false ,
>  types=(org.geotools.feature.type.FeatureAttributeType at e834ce,)]
>
>  whereas featureType2 is:
>  DefaultFeatureType [name=stazioni_meteo ,
>  namespace=http://www.opengis.net/gml , abstract=false ,
>  types=(DefaultAttributeType [name=the_geom , type=class
>  com.vividsolutions.jts.geom.Point , nillable=true, min=1,
>  max=1],DefaultAttributeType [name=ID , type=class java.lang.Long ,
>  nillable=true, min=1, max=1],DefaultAttributeType [name=IDSTAZIONE ,
>  type=class java.lang.Long , nillable=true, min=1,
>  max=1],DefaultAttributeType [name=Y , type=class java.lang.Double ,
>  nillable=true, min=1, max=1],DefaultAttributeType [name=X , type=class
>  java.lang.Double , nillable=true, min=1, max=1],DefaultAttributeType
>  [name=DESCRIZION , type=class java.lang.String , nillable=true, min=1,
>  max=1],DefaultAttributeType [name=TIPOLOGIA_ , type=class
>  java.lang.Long , nillable=true, min=1, max=1],DefaultAttributeType
>  [name=RELATED_ID , type=class java.lang.Long , nillable=true, min=1,
>  max=1],DefaultAttributeType [name=RETE_ID , type=class java.lang.Long
>  , nillable=true, min=1, max=1],DefaultAttributeType [name=ATTIVO ,
>  type=class java.lang.String , nillable=true, min=1, max=1],)]
>
>
>  which is what I really want. But how do I get it from a layer that
>  doesn't have any feature on it?
>
>  Ciao
>  Andrea
>
>
>
>  On Sat, May 3, 2008 at 12:08 AM, andrea antonello
>
> <andrea.antonello at gmail.com> wrote:
>
>
> > Alright, I think I miss something.
>  >
>  >  [...]
>  >
>  > >  Object attributes[] = DataUtilities.defaultValues( featureType );
>  >
>  >  That is what I thought I would need, btut attributes[0], seems to
>  >  contain it all:
>  >
>  >  [Feature[ id=fid-861f70d_119aa748a37__7fec , the_geom=null , ID=null ,
>  >  IDSTAZIONE=null , Y=null , X=null , DESCRIZION=null , TIPOLOGIA_=null
>  >  , RELATED_ID=null , RETE_ID=null , ATTIVO=null ]]
>  >
>  >  Isn't this a full feature structure?
>  >
>  >  >  attributes[0] = geometry?
>  >
>  >  If I do this, then I get an exception in the next:
>  >
>  >  >  featureType.create( attributes );
>  >
>  >  telling me that:
>  >
>  >  IllegalAttribute: org.geotools.feature.Feature , but got
>  >  com.vividsolutions.jts.geom.Point
>  >
>  >  So the attribute is expected to be a feature, instead of one of the
>  >  attributes, geometry or non geometry?
>  >
>  >  Investigating further...
>  >  Andrea
>  >
>  >
>  >
>  >
>  >
>  >
>  >  >
>  >  >  There is also a method for dealing with a single AttributeType
>  >  >
>  >  >  Object value = DataUtilities.defaultValue( attributeTypes[0] );
>  >  >
>  >  > > Should this work?
>  >  > >
>  >  > >
>  >  >  Your example looked fine (and similar to the code in DataUtilities), I
>  >  > think you now may be arguing with your DataStore or working with invalid
>  >  > data?
>  >  >
>  >  >
>  >  >  Jody
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>  >
>