| Re: [udig-devel] Pattern for updating features based on attribute change |
Thanks Andrea..that's a nice design -- similar to the EMF command designs -- though they aren't really suited here mostly because I need a lighter weight (better performing solution). However...they did give me exactly the pointers I needed for how to accomplish what I wanted. Mimicking what the SetAttributeEditCommand is doing, I'm able to update the attribute in the shape file itself. This was also a good source of information on it: Here's my test code on the chance it will be useful for others..I'm just walking through each attribute and assigning it a random color. public void createPartControl(Composite parent) { ... URL resourceId = new URL( style = styleFactory.createStyle(); ICatalog localCatalog = CatalogPlugin.getDefault().getLocalCatalog(); List<IService> services = CatalogPlugin.getDefault().getServiceFactory().createService(resourceId); IService service = services.get(0); localCatalog.add(services.get(0)); resource = service.resources(null).get(0); featureSource = resource.resolve(FeatureSource.class, null); try { FeatureCollection<SimpleFeatureType, SimpleFeature> shapeFeatures = featureSource.getFeatures(); features = DataUtilities.collection(shapeFeatures); layer = getMap().getLayerFactory().createLayer(resource); getMap().getLayersInternal().add(layer); layer.getStyleBlackboard().put(SLDContent.ID, style); featureStore = service.resolve(ShapefileDataStore.class, null); } catch (IOException e1) { throw new RuntimeException(e1); } createStyle(); ... new Thread() { public void run() { while (true) { try { sleep(500); //Need a delay to avoid buffering issues.. } catch (InterruptedException e) { } try { // setDirty(true); doesn't seem neccesary.. viewer.getRenderManager().refresh(null); modMap(); } catch (Exception e) { System.err.println(e); } } }; }.start(); } private void modMap() { Iterator iterator = features.iterator(); try { // DefaultTransaction transaction = new DefaultTransaction("test"); FeatureWriter<SimpleFeatureType, SimpleFeature> writer = featureStore .getFeatureWriter(Transaction.AUTO_COMMIT); for (Feature feature = (Feature) iterator.next(); iterator.hasNext(); feature = (Feature) iterator.next()) { SimpleFeature sf = (SimpleFeature) feature; Long l = (long) (Math.random() * features.size()); try { SimpleFeature next = writer.next(); next.setAttribute("MY_ATTR", l); writer.write(); } catch (IOException e) { throw new RuntimeException(e); } // try { // transaction.commit(); // } catch (IOException e) { // throw new RuntimeException(e); // } } writer.close(); // transaction.commit(); // transaction.close(); } catch (IOException e) { throw new RuntimeException(e); } features.close(iterator); } On Aug 13, 2010, at 1:23 PM, andrea antonello wrote:
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