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Re: Problem with reusing a featuretype (was: Re: [udig-devel] two questions about using shapefiles for uncommon things)
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Hello,
Yes, I think your second assumption is correct: you probably can't
create two resources with the same feature type in the
SimpleMemoryDataStore. (I say "I think" because I'm remembering this
vaguely from some time ago.). However, Jesse or others will confirm this
when they get to work West North American Coast time.
Can you save the first resource to an in memory database or to disk?
--adrian
On Mon, 2007-03-26 at 09:51 +0200, tony.roth@xxxxxx wrote:
> Hi,
> no, that's not correct. I create exactly one feature type with the
> name and then I want to create two resources (later: two layer) of
> this type. It's like
>
> FeatureTypeBuilder featureBuilder
> = FeatureTypeBuilder.newInstance(myFeatureTypeName);
> // ... add attributes to this type
> FeatureType featureType = featureBuilder.getFeatureType();
> resource =
> CatalogPlugin.getDefault().getLocalCatalog().createTemporaryResource(featureType);
> resource2 =
> CatalogPlugin.getDefault().getLocalCatalog().createTemporaryResource(featureType);
>
> The second resource could not be build (see exception below). Either
> it is not allowed to create more than one resource of a featureType or
> the implementaion in udig has a bug. I think it can be a common
> usecase to have different layer containing features of the same
> featuretype.
>
> tony roth
>
>
> Von: Jesse Eichar jeichar@xxxxxxxxxxxxxxx
>
> Hi Tony,
>
> I think that the problem is that the two feature types have
> the same
> name so the second can't be created.
>
> Try something like:
>
> FeatureTypeBuilder builder=new FeatureTypeBuilder();
> builder.importType( oldType );
> builder.setName( "newname" );
> builder.getFeatureType();
>
> Jesse
>
>
> On Mar 23, 2007, at 9:08 AM, tony.roth@xxxxxx wrote:
>
> >
> >
> >> Von: Jesse Eichar
> >> On 20-Feb-07, at 4:38 AM, tony.roth@xxxxxx wrote:
> >>> Hi list,
> >>> in our project we are using jira plugins in our eclipse
> rcp
> >>> application. It is used for the visualization of
> different
> >>> facilities
> >>> on a map. The map is delivered by a wms server, the
> facilities are
> > stored
> >>> in a database (mysql). To show these facilities a
> temporary
> >>> shape file
> >>> is created. It was a funny thing writing mixed up big and
> little
> >>> endian
> >>> variables with java but finally it works :-) (yes, I
> suppose
> >>> somewhere
> >>> an api / lib exists but.. where?)
> >>> i) Is this the canonic way? Or is it somehow possible to
> create an
> >>> in-memory layer instead of writing a shape file?
> >> There are code snippets for just this sort of thing at:
> >>
> > http://svn.geotools.org/udig/branches/1.1.x/udig/tutorials/
> > net.refractions
> >> .udig.code.examples/src/net/refractions/udig/code/examples/
> >
> > I have a problem with reusing a generated featuretype:
> >
> > At first I create the featuretype (this is done exactly
> once):
> >
> > FeatureTypeBuilder featureBuilder =
> > FeatureTypeBuilder.newInstance(myFeatureTypeName);
> >
> featureBuilder.addType(AttributeTypeFactory.newAttributeType
> > ("geometry",
> > Point.class,true, Integer.MAX_VALUE, null,
> > DefaultGeographicCRS.WGS84));
> >
> featureBuilder.addType(AttributeTypeFactory.newAttributeType("foo",
> > String.class, true, Integer.MAX_VALUE));
> >
> featureBuilder.addType(AttributeTypeFactory.newAttributeType("bar",
> > String.class, true, Integer.MAX_VALUE));
> > FeatureType featureType = featureBuilder.getFeatureType();
> >
> >
> > then I create the ressource:
> >
> > resource =
> >
> CatalogPlugin.getDefault().getLocalCatalog().createTemporaryResource
> > (featureType);
> >
> >
> > I itereate through a list of values and add features to the
> ressource:
> >
> > GeometryFactory fac = new GeometryFactory();
> > FeatureStore fs = resource.resolve(FeatureStore.class,
> null);
> >
> > for (ListItem item : list) {
> > Coordinate pointCoordinate = new Coordinate(item.get...);
> > Point point = fac.createPoint(pointCoordinate);
> > String foo = item.get...
> > String bar = item.get...
> > Feature feature = featureType.create(new
> Object[]{point,foo,bar});
> > fs.addFeatures(DataUtilities.collection(new
> Feature[]{feature}));
> > }
> >
> > finally I create the layer
> > LayerFactory layerFactory = map.getLayerFactory();
> > Layer layer = layerFactory.createLayer(resource);
> > ...
> >
> > This works and the layer is shown in the map
> >
> > Later the application tries to create a new layer based on
> a
> > resource of
> > this featuretype. It starts with
> > resource =
> >
> CatalogPlugin.getDefault().getLocalCatalog().createTemporaryResource
> > (featureType);
> >
> > (like above) but I get an exception:
> >
> > java.lang.RuntimeException
> > at
> >
> >
> net.refractions.udig.catalog.internal.CatalogImpl.createTemporaryResou
> > rce(CatalogImpl.java:749)
> >
> > at ... the row with [resource = CatalogPlugin....] (see
> above)
> >
> > Caused by: java.lang.UnsupportedOperationException: Schema
> > modification not
> > supported
> > at
> > org.geotools.data.AbstractDataStore.updateSchema
> > (AbstractDataStore.java:228)
> >
> > at
> >
> >
> net.refractions.udig.catalog.memory.internal.TemporaryResourceFactory.
> > createResource(TemporaryResourceFactory.java:48)
> >
> > at
> >
> >
> net.refractions.udig.catalog.internal.CatalogImpl.createTemporaryResou
> > rce(CatalogImpl.java:743)
> >
> > ... 54 more
> >
> > What am I doing wrong? I'm not modifyfing the featureType
> any more,
> > I just
> > want to create a new (a second) ressource based on the
> featureType.
> > Isn't
> > it possible?
> > In
> >
> net.refractions.udig.catalog.memory.internal.TemporaryResourceFactory.
> > createResource
> > udig wants to update the featureType but it seems to be not
> allowed.
> >
> > thanks for any help,
> > tony roth
> >
> > ps At the moment we are using UDIG 1.1 RC8 in our project.
> >
> > _______________________________________________
> > User-friendly Desktop Internet GIS (uDig)
> > http://udig.refractions.net
> > http://lists.refractions.net/mailman/listinfo/udig-devel
>
> _______________________________________________
> User-friendly Desktop Internet GIS (uDig)
> http://udig.refractions.net
> http://lists.refractions.net/mailman/listinfo/udig-devel
>
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> _______________________________________________
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