[udig-devel] Save programatically created layer

[Jesse Eichar]

Hi,

Sounds like a good project.  I'm a little disappointed that the  
MapEditor doesn't show that the layer is dirty but I think there is an  
easy work around.  The main thing I think is to open the map before  
adding a layer.  Also there are ways to create the layer that takes  
less code.

Here's a slightly modified version.  I'm doing this in my email  
program so it probably won't compile but it should give you the idea:

public static Layer CreateNewLayer(Vector<Feature> vf, String name,  
java.awt.Color color, IProgressMonitor monitor) {
   FeatureType schema = vf.get(0).getFeatureType();
   IGeoResource resource =  
Catalog.getDefault().createTemporaryResource( schema );
   resource.resolve( FeatureStore.class,  
monitor ).removeFeatures(Filter.NONE);
   List<ILayer> layers = ApplicationGIS.addLayers(null,  
Collections.singleList(resource) );
   return layers.get(0);
}


I added a line to remove all the features from the layer just in case  
it was previously used.

Jesse

Le 18-Feb-08 à 2:43 PM, ragga doll a écrit :

> Hi everyone !
>
> I’m working on a plugin for uDig (hydrology’ stream extraction).  
> This plugin extracts some Features (MultiLineString) and creates a  
> layer with them, programmatically.
> But after layer’s creation, I can’t save my layer : save and save  
> all menu entries are not enable (and I don’t want to save the layer  
> programmatically).
> So I wonder how can I enable, programmatically, save and save all  
> menu entries after creating layer. Or something to tell to the map :  
> there is a modification, you can be saved !
> Because when you add a layer to a map, the map’s name doesn’t have a  
> “star” upon herself : map*, to signify that the map is modified,  
> even it’s a empty layer or not.
>
> Using Udig 1.1 RC12 code sources, java 6 and eclipse
>  3.3.0
>
> Thanks for your help!
>
> Seb.
>
>
> My code :
>
>
> public static Layer CreateNewLayer(Vector<Feature> vf, Map map,  
> String name, java.awt.Color color, IProgressMonitor progressmonitor)
> {
> 	Layer l = null;
>
> 	IGeoResource resource = null ;
> 		
> 	try
> 	{
> 		resource = createGeoResource(vf, true, progressmonitor);
> 		l = map.getLayerFactory().createLayer(resource);
> 	}
> 	catch ( IOException e )
> 	{
> 		e.printStackTrace();
> 	}
>
> 	map.getLayersInternal().add(l);
>
> 	l.setName(name);
>
> 	ChangeCouleurLayer(l, color, progressmonitor);
> 		
> 	return l;
> }
>
>
> private static IGeoResource createGeoResource(Vector<Feature>  
> features, boolean deleteService, IProgressMonitor progressmonitor)  
> throws IOException
> {
> 	IService service = getService(features, deleteService,  
> progressmonitor);
>
> 	List<? extends IGeoResource> resources =
>  service.members(progressmonitor);
> 	for ( IGeoResource resource : resources )
> 	{
> 		if ( resource.resolve(FeatureSource.class,  
> progressmonitor 
> ).getSchema 
> ().getTypeName 
> ().equals(features.get(0).getFeatureType().getTypeName()) )
> 			return resource;
> 	}
> 	// hopefully will never happen.
> 	return null;
> }
>
>
> public static IService getService(Vector<Feature> features, boolean  
> deleteService, IProgressMonitor monitor) throws IOException
> {
> 	ICatalog catalog = CatalogPlugin.getDefault().getLocalCatalog();
> 	List<IResolve> services = catalog.find(new URL("http://localhost/scratch 
> "), monitor);
> 	IService service = null;
> 	if ( services.isEmpty() )
> 	{
> 		service = createService(catalog);
> 	}
> 	else
> 	{
> 		IResolve resolve = services.get(0);
> 		if ( resolve instanceof IGeoResource )
> 		{
> 			IGeoResource resource = (IGeoResource) resolve;
> 			service =
>  (IService) resource.parent(null);
> 		}
> 		else
> 			if ( resolve instanceof IService )
> 			{
> 				service = (IService) services.get(0);
> 			}
> 	}
> 	if ( deleteService )
> 	{
> 		catalog.remove(service);
> 		service = createService(catalog);
> 	}
>
> 	MemoryDataStore ds = service.resolve(MemoryDataStore.class, monitor);
> 	try
> 	{
> 		ds.getSchema(features.get(0).getFeatureType().getTypeName());
> 			
> 		if ( deleteService )
> 			throw new IOException("FeatureType already exists in Service");
> 	}
> 	catch ( SchemaNotFoundException exception )
> 	{
> 		// verified that schema does not yet exist.
> 	}
> 	ds.addFeatures(features);
> 	return service;
> }
>
> private static IService createService(ICatalog catalog) throws  
> MalformedURLException
> {
> 	IService service;
> 	MemoryServiceExtensionImpl ext = new MemoryServiceExtensionImpl();
>
> 	java.util.Map<String, Serializable> params = ext.createParams(new
>  URL("http://localhost/scratch"));
> 	service = (MemoryServiceImpl) ext.createService(new URL("http://localhost/scratch 
> "), params);
> 	catalog.add(service);
> 	return service;
> }
>
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