Examples of org.locationtech.udig.catalog.IService

org.locationtech.udig.catalog.IService

Represents a geo spatial service handle. Follows the same design as IResource.

Represents a spatial service, which may be lazily loaded. The existance of this object does not ensure that the advertized data is guaranteed to exist, nor does this interface guarantee that the service exists based on this object's existance. We should also note the resource management is left to the user, and that resolve() is not guaranteed to return the same instance object from two subsequent calls, but may. This is merely a handle to some information about a service, and a method of aquiring an instance of the service ...

NOTE: This may be the result of communications with a metadata service, and as such this service described may not be running right now. Remember to check the service status.

Implementing an IService

Implement the abstract methods and you are good to go.

Extending an IService

You may want to implement your own IService in order to provide a handle for a new kind of API.

New method:

  public API getAPI( ProgressMonitor monitor){ if (monitor == null) monitor = new NullProgressMonitor(); monitor.beingTask("Connect to API",2); try {             String server = getConnectionParams().get("server"); monitor.worked(1); return new API( s ); } finally { monitor.done(); } }

(note the use of NullProgressMonitor)

Optional: Customize resolve method to advertise your new API "dynamically"

  public <T> boolean canResolve( Class<T> adaptee ) { return adaptee != null && (adaptee.isAssignableFrom(API.class) || super.canResolve(adaptee)); } public <T> T resolve( Class<T> adaptee, IProgressMonitor monitor ) throws IOException { if (monitor == null) monitor = new NullProgressMonitor();  if (adaptee == null) throw new NullPointerException("No adaptor specified" ); if (adaptee.isAssignableFrom(API.class)) { return adaptee.cast(getAPI(monitor)); } return super.resolve(adaptee, monitor); }

(note the call to super)

Optional: cache your API as the "connection"

  API api = null; Throwable msg = null; public synchronized API getAPI( ProgressMonitor monitor){ if( api != null ) return api; if (monitor == null) monitor = new NullProgressMonitor(); monitor.beingTask("Connect to API",2); try {             String server = getConnectionParams().get("server"); monitor.worked(1); api = new API( s ); monitor.worked(1); return api; } finally { monitor.done(); } } public Status getStatus() { return msg != null? Status.BROKEN : api == null? Status.NOTCONNECTED : Status.CONNECTED; } public Throwable getMessage(){ return msg; } public synchronized void dispose( ProgressMonitor monitor ){ if( api != null ){ api.dispose(); api = null; } if( msg != null ) msg = null; }

(Note the use of getMessage and getStatus)

@author David Zwiers, Refractions Research @since 0.6 @version 1.2 @see IServiceInfo @see IServiceFactory

        }
    }
    
    @Override
    public GeoTiffServiceImpl service(IProgressMonitor monitor) throws IOException {
      IService serv = super.service(monitor);
      return (serv != null && serv instanceof GeoTiffServiceImpl) 
          ? (GeoTiffServiceImpl) serv : null;
    }

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            // get the layers of the map
            List<Layer> layers = ((MapImpl) projectElement).getLayersInternal();


            for( ILayer layer : layers ) {


                IService service = null;
                try {
                    service = layer.getGeoResource().service(null);
                    if (service.canResolve(ServiceMover.class)) {
                        ServiceMover tmp = service.resolve(ServiceMover.class, null);
                        String msg = tmp.move(projectDataFolder);
                        if (msg != null) {


                            MessageDialog.openError(PlatformUI.getWorkbench().getDisplay()
                                    .getActiveShell(), "Comsolidation Error", msg);

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        URL location = new File(url).toURI().toURL();


        JGrassServiceExtension creator = new JGrassServiceExtension();


        Map<String, Serializable> params = creator.createParams(location);
        IService service = creator.createService(location, params);
        service.getInfo(monitor); // load it


        jgrassServices = new ArrayList<IService>();
        jgrassServices.add(service);


        /*

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  @Override
  void makeAssertion(String assertionDescription, ICatalog catalog) throws Exception {
    super.makeAssertion(assertionDescription, catalog);
    
    IService service;
    try {
      service = (IService) catalog.members(null).get(0);
      assertTrue("All services must be WMSServices", service instanceof WMSServiceImpl); //$NON-NLS-1$
    } 
    catch (IOException e) {

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  void makeAssertionMulti(String assertionDescription, ICatalog catalog) {
    super.makeAssertionMulti(assertionDescription, catalog);
    
    try {
      for (Iterator<IResolve> itr = catalog.members(null).iterator(); itr.hasNext();) {
        IService s = (IService)itr.next();
        assertTrue("All services must be WMSServices", s instanceof WMSServiceImpl); //$NON-NLS-1$
      }
    } 
    catch (IOException e) {
      e.printStackTrace();

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     * @return
     * @throws IOException
     */
    @SuppressWarnings("unchecked")
    public Layer createLayer(IGeoResource resource) throws IOException {
        IService service = resource.service(ProgressManager.instance().get());


        if (service == null) {
            return null;
        }
        // check that the service is part of catalog... If not add
        ICatalog local = CatalogPlugin.getDefault().getLocalCatalog();
        if (local.getById(IService.class, service.getID(), new NullProgressMonitor()) == null) {
            local.add(resource.service(null));
        }


        LayerImpl layer = (LayerImpl) ProjectFactory.eINSTANCE.createLayer();

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        }));
        
        // add the diff shapefile as a udig resource
        URL url = tmp.toURI().toURL();
        IRepository local = CatalogPlugin.getDefault().getLocal();
        IService service = local.acquire( url, null );
        
        // List<IService> services = CatalogPlugin.getDefault().getServiceFactory().createService(tmp.toURL());
        // IService service = services.get(0);
        // CatalogPlugin.getDefault().getLocalCatalog().add(service);
        List< ? extends IGeoResource> resources = service.resources(null);
        
        IGeoResource resource = resources.get(0);
        
        Map map = ((Map)layers[0].getMap());
        LayerFactory factory = map.getLayerFactory();

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        assertNotNull("sample data found", target );
        Map<String, Serializable> params = serviceExtension.createParams( target );
        
        assertNotNull("canProcess", params );
        
        IService service = serviceExtension.createService( null, params );
        assertNotNull("connected", service );
        
        assertTrue("Datastore available", service.canResolve( DataStore.class));
        
        DataAccess dataStore = service.resolve( DataStore.class, null );
        assertNotNull("DataStore connected", dataStore );
        
        Name typeName = (Name) dataStore.getNames().get(0);;
        FeatureSource featureSource = dataStore.getFeatureSource( typeName );
        
        assertEquals( 4, featureSource.getCount( Query.ALL ) );
        
        //IServiceInfo info = service.getInfo(new NullProgressMonitor());
        IServiceInfo info = getInfo(service, new NullProgressMonitor());
        assertNotNull("Title available", info.getTitle());
        assertNotNull("Description available", info.getDescription());
        
        List<? extends IGeoResource> m = service.resources(new NullProgressMonitor());
        for(IGeoResource resource: m) {
            ID id = resource.getID();
            assertNotNull(id);
            //IGeoResourceInfo grinfo = resource.getInfo(new NullProgressMonitor());
            IGeoResourceInfo grinfo = getInfo(resource, new NullProgressMonitor());

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        // ensure the service was created
        assertNotNull(services);
        assertEquals(1, services.size());


        // ensure the right type of service was created
        IService service = services.get(0);
        assertNotNull(service);


        ICatalog catalog = CatalogPlugin.getDefault().getLocalCatalog();
        catalog.add(service); // we can now find this service!

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  protected void createResources(List<IGeoResource> resources, 
      IProgressMonitor monitor) throws IOException {
    
    @SuppressWarnings("nls")
        URL url = FileLocator.resolve(FileLocator.find(Activator.getDefault().getBundle(), new Path("data/face.shp"), Collections.emptyMap()));
    IService r = CatalogPlugin.getDefault().getLocalCatalog().acquire(url, monitor);
    resources.add(r.resources(monitor).get(0));
  }

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Related Classes of org.locationtech.udig.catalog.IService

org.eclipse.core.runtime.NullProgressMonitor

org.eclipse.core.runtime.SubProgressMonitor

org.locationtech.udig.catalog.csw.CswResource$CswWFSResource

org.locationtech.udig.catalog.csw.CswResource$CswWMSResource

org.locationtech.udig.catalog.geotools.data.GeoToolsDataStoreServiceTest

org.locationtech.udig.catalog.google.GoogleResource$GoogleWFSResource

org.locationtech.udig.catalog.google.GoogleResource$GoogleWMSResource

org.locationtech.udig.catalog.internal.CatalogImpl

org.locationtech.udig.catalog.internal.db2.ui.DB2WizardPage

org.locationtech.udig.catalog.internal.geotiff.GeoTiffGeoResourceImpl

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