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package com.vaadin.terminal.gwt.server;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.vaadin.Application;
@SuppressWarnings("serial")
public class ApplicationRunnerServlet extends AbstractApplicationServlet {
/**
* The name of the application class currently used. Only valid within one
* request.
*/
String applicationClassName = "";
@Override
public void init(ServletConfig servletConfig) throws ServletException {
super.init(servletConfig);
}
@Override
protected void service(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
applicationClassName = getApplicationRunnerApplicationClassName(request);
super.service(request, response);
applicationClassName = "";
}
@Override
URL getApplicationUrl(HttpServletRequest request)
throws MalformedURLException {
URL url = super.getApplicationUrl(request);
String path = url.toString();
path += applicationClassName;
path += "/";
return new URL(path);
}
@Override
protected Application getNewApplication(HttpServletRequest request)
throws ServletException {
// Creates a new application instance
try {
Class<?> applicationClass = getClassLoader().loadClass(
applicationClassName);
final Application application = (Application) applicationClass
.newInstance();
return application;
} catch (final IllegalAccessException e) {
throw new ServletException(e);
} catch (final InstantiationException e) {
throw new ServletException(e);
} catch (final ClassNotFoundException e) {
throw new ServletException(
new InstantiationException(
"Failed to load application class: "
+ applicationClassName));
}
}
private String getApplicationRunnerApplicationClassName(
HttpServletRequest request) {
return getApplicationRunnerURIs(request).applicationClassname;
}
private static class URIS {
String widgetsetPath;
String applicationURI;
String context;
String runner;
String applicationClassname;
}
/**
* Parses application runner URIs.
*
* If request URL is e.g.
* http://localhost:8080/itmill/run/com.vaadin.demo.Calc then
* <ul>
* <li>context=itmill</li>
* <li>Runner servlet=run</li>
* <li>Toolkit application=com.vaadin.demo.Calc</li>
* </ul>
*
* @param request
* @return string array containing widgetset URI, application URI and
* context, runner, application classname
*/
private static URIS getApplicationRunnerURIs(HttpServletRequest request) {
final String[] urlParts = request.getRequestURI().toString().split(
"\\/");
String context = null;
String runner = null;
URIS uris = new URIS();
String applicationClassname = null;
String contextPath = request.getContextPath();
if (urlParts[1].equals(contextPath.replaceAll("\\/", ""))) {
// class name comes after web context and runner application
context = urlParts[1];
runner = urlParts[2];
if (urlParts.length == 3) {
throw new IllegalArgumentException("No application specified");
}
applicationClassname = urlParts[3];
uris.widgetsetPath = "/" + context;
uris.applicationURI = "/" + context + "/" + runner + "/"
+ applicationClassname;
uris.context = context;
uris.runner = runner;
uris.applicationClassname = applicationClassname;
} else {
// no context
context = "";
runner = urlParts[1];
if (urlParts.length == 2) {
throw new IllegalArgumentException("No application specified");
}
applicationClassname = urlParts[2];
uris.widgetsetPath = "/";
uris.applicationURI = "/" + runner + "/" + applicationClassname;
uris.context = context;
uris.runner = runner;
uris.applicationClassname = applicationClassname;
}
return uris;
}
// @Override
@Override
protected Class getApplicationClass() throws ClassNotFoundException {
// TODO use getClassLoader() ?
return getClass().getClassLoader().loadClass(applicationClassName);
}
@Override
String getRequestPathInfo(HttpServletRequest request) {
String path = request.getPathInfo();
if (path == null) {
return null;
}
path = path.substring(1 + applicationClassName.length());
return path;
}
@Override
String getWidgetsetLocation(HttpServletRequest request) {
URIS uris = getApplicationRunnerURIs(request);
String widgetsetPath = uris.widgetsetPath;
if (widgetsetPath.equals("/")) {
widgetsetPath = "";
}
return widgetsetPath;
}
}
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