[udig-devel] Problem with FeatureCollection, FeatureTableControl and CollectionListener

[Jesse Eichar]

Hi Ingmar,

So I have a few points.

1.  I think in the case of the Geometry column always being GEOMETRY  
isn't actually caused by createTemporaryResource().  I just checked.   
You can see the feature type of a layer by right click on a layer and  
viewing its properties.
2.  I am dragging this out of the dark corners of my mind but if I  
remember correctly it is actually the FeatureTableControl that does  
that.  For some reason the implementor decided to label the Geometry  
column GEOMETRY always.  And I think it just displays the type of  
geometry.
3.  A very minor point:  You are getting LATLONG by using  
CRS.decode("EPSG"4326") this is not the most efficient way of doing  
it, at least for this version of uDig.  I'd suggest  
DefaultGeographicCRS.WGS84.

Now for your question about events.  There are a few things you have  
to know.

1.  Most events that are fired from feature operations will occur in a  
background thread so they cannot update the UI directly.  Rather you  
have to run the update in the Display thread.

The display thread can usually be obtained by:   
PlatformUI.getWorkbench().getDisplay();

Now that you have the display you can run a runnable in the display  
thread using the method syncExec(runnable) or asyncExec(runnable).

2.  To get a commit event from the FeatureStore is VERY hard right  
now, although we are fixing on uDig/Geotools trunk.  So for the commit  
event I would suggest listening to the EditManager.  For the  
individual edit events I would listen to the FeatureSource as you are  
doing.

Hope this helps,

Jesse

Le 14-Feb-08 à 4:26 PM, Ingmar Eveslage a écrit :

>
> Hello,
>
> i try to do the following:
>
> //create FeatureType
> 	CoordinateReferenceSystem crs = CRS.decode("EPSG:4326");
> 	AttributeType point =
> AttributeTypeFactory.newAttributeType("Location",Point.class,true,
> null,null,crs );
> 	AttributeType name = AttributeTypeFactory.newAttributeType("Name",
> String.class, false, null, "Station", null);
> 	FeatureType stationFeatureType =  
> FeatureTypeBuilder.newFeatureType(new
> AttributeType[] { point, name }, "StationFeatureType");
>
> //create IGeoResource
> 	IGeoResource stationGeoResource =
> CatalogPlugin 
> .getDefault 
> ().getLocalCatalog().createTemporaryResource(stationFeatureType);
>
> //create list of IGeoResource
> 	List <IGeoResource> geoResourceList = new LinkedList<IGeoResource>();
> 	geoResourceList.add(stationGeoResource);
>
> //create new map
> 	ApplicationGIS.createAndOpenMap(geoResourceList, null, true);
>
> //get the new layer
> 	ILayer stationLayer = null;
> 	List <ILayer> layerList = network.getEditorMap().getMapLayers();
> 	for (ILayer layer: layerList) {
> 		if (layer.getName().compareTo("StationFeatureType") == 0)
> 			stationLayer = layer;
> 	}
>
> //get FeatureSource
> 	FeatureSource stationFeatureSource =
> stationLayer.getResource(FeatureSource.class, null);
>
> //get FeatureCollection
> 	FeatureCollection features = stationFeatureSource.getFeatures();
>
> //AFTER all this i create i view wich displays a FeatureTableControl
> FeatureTableControl ftc = new FeatureTableControl(parent, features);
>
> All seams fine, but i notices a few problems:
>
> 1) the automatic created column header for the AttributeType point is
> "GEOMETRY". but i defined it as "Location". The first thing is a
> nullPointerException if the FeatureTableControl wants to display a  
> feature.
> When i change the name of my attributetype to "GEOMETRY" all is  
> fine. But i
> think this is a bug.
>
> 2) if i add features to the layer, no updates in the table will be
> displayed. and i do not realy know which listener i should take. i  
> tried the
> following:
> every implementation of the changed method makes a tfc.update.
>
> map.getEditManager().addListener(view_i_created);
> 	--> all updates are seen, but if i make i commit of the station  
> layer i get
> a "invalid thread access exception"
> stationFeatureSource.addFeatureListener(view_i_created);
> 	--> all updates are listed in the table, but the commit of the  
> station
> layer makes no update. so all the FID are still "new*" and not the  
> real one
> features.addListener(view_i_created);
> 	--> nothing happens. no CollectionEvent fired
>
> i looked in the FeatureTableControl implementation and i think this
> implementation uses the CollectionListener interface too. but when no
> CollectionEvents are fired, no updates are displayed.
>
> i hope someone can help me with my 2 problem. perhaps this are bugs  
> or do i
> missunderstand the api?
>
> thanks forward
>
> Ingmar
>
>
> -- 
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>
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