StaticResources.java

package com.vaadin.osgi;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;
import java.util.Map;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.osgi.framework.Bundle;
import org.osgi.framework.BundleContext;
import org.osgi.service.http.HttpService;

import aQute.bnd.annotation.component.Activate;
import aQute.bnd.annotation.component.Component;
import aQute.bnd.annotation.component.Deactivate;
import aQute.bnd.annotation.component.Reference;

/**
 * This class runs as an OSGi component and serves the themes and widgetsets
 * directly from the core Vaadin bundle.
 * <p/>
 * 
 * To add your own theme or widget set create a fragment which contains your
 * theme/widgetset files and export those as packages. The
 * <code>Fragment-Host</code> should be set to the Vaadin core bundle. The
 * fragment containing your theme/widgetset resources will be added to the core
 * Vaadin bundle dynamically.
 * <p/>
 * 
 * Of course static resources should really be deployed separately to a web
 * server that proxies servlet requests on to the container.
 * 
 * @author brindy
 */
@SuppressWarnings("serial")
@Component(enabled = true, properties = { "http.alias=/VAADIN" })
public class StaticResources extends HttpServlet {

	private HttpService httpService;

	private String alias;

	private Bundle vaadin;

	@Reference(service = HttpService.class)
	public void bind(HttpService httpService) {
		this.httpService = httpService;
	}

	@Activate
	public void start(BundleContext ctx, Map<String, String> properties)
			throws Exception {
		// find the vaadin bundle:
		for (Bundle bundle : ctx.getBundles()) {
			if (bundle.getSymbolicName().equals("com.vaadin")) {
				vaadin = bundle;
				break;
			}
		}

		alias = properties.get("http.alias");
		httpService.registerServlet(alias, this, null, null);
	}

	@Deactivate
	public void stop() {
		httpService.unregister(alias);
	}

	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		String path = req.getPathInfo();
		String resourcePath = alias + path;

		URL u = vaadin.getResource(resourcePath);

		System.out.println(resourcePath + " : " + u);

		if (null == u) {
			resp.sendError(HttpServletResponse.SC_NOT_FOUND);
			return;
		}

		InputStream in = u.openStream();
		OutputStream out = resp.getOutputStream();

		byte[] buffer = new byte[1024];
		int read = 0;
		while (-1 != (read = in.read(buffer))) {
			out.write(buffer, 0, read);
		}
	}

}