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Re: [udig-devel] Pattern for updating features based on attribute change
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Hi Miles,
On Fri, Aug 13, 2010 at 9:47 PM, Miles Parker <milesparker@xxxxxxxxx> wrote:
> Hi,
> I hope this is the appropriate place to ask this question -- not sure if it
> is a geotools issue or if that even matters.
> I got the map viewer (IViewPart implementation) working well, and I was able
> to get styles to update dynamically, so I think I more or less have the
> basic patterns worked out. But I'm having trouble figuring out the recipe
> for my key use case:
> "Change feature attributes dynamically and have those changes reflected on
> the map."
I will try to stop here at first and point you to this:
http://udig.refractions.net/confluence/display/DEV/4+Edit+Commands
which is part of:
http://udig.refractions.net/confluence/display/DEV/04+Commands
It shows how to delete a feature but I remember there is also a create
feature and set attribute/geometry. Just look into the Type Hierarchy
and you will have them.
Hope that helps, else let me know,
Ciao
Andrea
> I have the first part, in that I figured out how that the ShapeFileDataStore
> was read only. So I created a MemoryDataStore for that. I gather that that
> is slow, but I couldn't see a better way of making the shape file
> modifiable. Now, I can get the attributes to change to new values. As I
> mentioned, I can also get a map to update regularly. But I can't get the
> values to hook up with the map.
> First, I load in the shape file like so:
> URL resourceId = new URL(
> "file:///blah/blah/shapefiles/blah/foo.shp");
> ICatalog localCatalog =
> CatalogPlugin.getDefault().getLocalCatalog();
> List<IService> services =
> CatalogPlugin.getDefault().getServiceFactory().createService(resourceId);
> for (IService service : services) {
> localCatalog.add(service);
> for (IGeoResource resource : service.resources(null)) {
> FeatureSource<SimpleFeatureType, SimpleFeature>
> featureSource = resource
> .resolve(FeatureSource.class, null);
>
>
>
> Then, I copy the feature into the memory store (I think..)
> FeatureCollection<SimpleFeatureType, SimpleFeature>
> shapeFeatures = featureSource.getFeatures();
> features = DataUtilities.collection(shapeFeatures);
> MemoryDataStore mds = new MemoryDataStore(features);
> mdsStore =
> mds.getFeatureSource(featureSource.getName());
>
> Now, I can add the original resource into the map..and as I say form that it
> displays properly, I can modify styles, etc..
> Layer createLayer =
> getMap().getLayerFactory().createLayer(resource);
> getMap().getLayersInternal().add(createLayer);
> createLayer.getStyleBlackboard().put(SLDContent.ID,
> style);
> Here's where I'm stuck, but perhaps there is a better approach altogether..
> I can't actually figure out how to get an IGeoResource for the MapDataStore
> to add it into the set of layers. I mean, this has to be straightforward
> but..?
> thanks for any hints,
> Miles
>
> _______________________________________________
> User-friendly Desktop Internet GIS (uDig)
> http://udig.refractions.net
> http://lists.refractions.net/mailman/listinfo/udig-devel
>
>
