Controller to handle Navigation in DD4T 2 Java

NavigationController.java

@Controller
public class NavigationController {
	private static final Logger LOG = LoggerFactory.getLogger(NavigationController.class);

	private SitemapFactory sitemapFactory;
	private PublicationResolver publicationResolver;
	private Sitemap sitemap;
	private String navigationViewPath = "";

	@RequestMapping(value = "/mainNavigation", method = { GET })
	public String mainNavigation(Model model, final HttpServletRequest request, final HttpServletResponse response)
			throws IOException, FactoryException {

		//Get current page
		final Page currentPage = (Page) request.getAttribute(Constants.PAGE_MODEL_KEY);
		
		//TODO: Extract to configuration
		String url = "/ww/en/sitemap.json";

		try {
			if (StringUtils.isEmpty(url)) {
				// url is not valid, throw an ItemNotFoundException
				throw new ItemNotFoundException("Navigation Url was empty or could not be resolved.");
			}

			Sitemap navigationModel = sitemapFactory.findSitemapByUrl(url, publicationResolver.getPublicationId(), sitemap.getClass());

			model.addAttribute("navigationModel", navigationModel);

			return navigationViewPath+"main-navigation";

		} catch (ItemNotFoundException e) {
			LOG.trace(e.getLocalizedMessage(), e);
			LOG.warn("Navigation with url '{}' could not be found.", url);
			response.sendError(HttpServletResponse.SC_NOT_FOUND);
		} catch (FactoryException e) {
			if (e.getCause() instanceof ItemNotFoundException) {
				LOG.warn("Navigation with url '{}' could not be found.", url);
				response.sendError(HttpServletResponse.SC_NOT_FOUND);
			} else {
				LOG.error("Factory Error.", e);
				response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
			}
		}

		return null;
	}

	public String getNavigationViewPath () {
		return navigationViewPath;
	}

	public void setNavigationViewPath (final String navigationViewPath) {
		this.navigationViewPath = navigationViewPath;
	}

	public PublicationResolver getPublicationResolver () {
		return publicationResolver;
	}

	public void setPublicationResolver (final PublicationResolver publicationResolver) {
		this.publicationResolver = publicationResolver;
	}

	public SitemapFactory getSitemapFactory() {
		return sitemapFactory;
	}

	public void setSitemapFactory(final SitemapFactory sitemapFactory) {
		this.sitemapFactory = sitemapFactory;
	}

	public Sitemap getSitemap() {
		return sitemap;
	}

	public void setSitemap(Sitemap sitemap) {
		this.sitemap = sitemap;
	}
}