On Fri, Jan 17, 2014 at 9:56 AM, Andreas Bergmann <[email protected]>wrote:
> Hi,
>
> I get an exception when I try to create shapefiles with geometries loaded
> from an Oracle Spatial database.
>
>
> 1) I fetch a geometry with hibernate spatial and use the type MultiPolygon
>
> ...
> @Column(name="GEOM")
> @Type(type = "org.hibernate.spatial.GeometryType")
> public MultiPolygon getGeom() {
> return this.Geom;
> }
> ...
>
> 2) Then I try to store the geometry as a shapefile, I adapapted the
> example Java code for this:
> SimpleFeatureType schema = feature.getFeatureType();
>
> CoordinateReferenceSystem dataCRS =
> schema.getCoordinateReferenceSystem();
> CoordinateReferenceSystem worldCRS = CRS.decode(epsg);
>
> DataStoreFactorySpi factory = new ShapefileDataStoreFactory();
> Map<String, Serializable> create = new HashMap<String,
> Serializable>();
> create.put("url", url);
> create.put("create spatial index", Boolean.TRUE);
> DataStore dataStore = factory.createNewDataStore(create);
> SimpleFeatureType featureType =
> SimpleFeatureTypeBuilder.retype(schema, worldCRS);
> dataStore.createSchema(featureType);
>
> Transaction transaction = new DefaultTransaction("Reproject");
> FeatureWriter<SimpleFeatureType, SimpleFeature> writer
> =
> dataStore.getFeatureWriterAppend(featureType.getTypeName(), transaction);
> try {
> SimpleFeature copy = writer.next();
> copy.setAttributes(feature.getAttributes());
>
> Geometry geometry = (Geometry)
> feature.getDefaultGeometry();
> Geometry outputGeometry = transformGeometry(geometry,
> dataCRS, worldCRS, true);
>
> copy.setDefaultGeometry(outputGeometry);
> writer.write();
> transaction.commit();
>
> }
> 3) But I get an exception from the SimpleFeatureBuilder
> org.geotools.data.DataSourceException: Cannot create a shape file whose
> geometry type is class com.vividsolutions.jts.geom.Geometry
>
> What can I do about this? I expected that com.vividsolutions.jts.geom.Geometry
> should work.
>
A shapefile can only contain a single type of geometry, so you have to
specify which one you're going to use,
either point, line or polygon. "Geometry" implies you can store any type of
geometry in the column, something
that a spatial database can do, but a shapefile cannot.
Cheers
Andrea
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