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/*
@ITMillApache2LicenseForJavaFiles@
*/
package com.vaadin.terminal.gwt.server;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import com.vaadin.Application;
import com.vaadin.ui.Root;
/**
* This servlet connects a Vaadin Application to Web.
*
* @author IT Mill Ltd.
* @version
* @VERSION@
* @since 5.0
*/
@SuppressWarnings("serial")
public class ApplicationServlet extends AbstractApplicationServlet {
// Private fields
private Class<? extends Application> applicationClass;
/**
* Called by the servlet container to indicate to a servlet that the servlet
* is being placed into service.
*
* @param servletConfig
* the object containing the servlet's configuration and
* initialization parameters
* @throws javax.servlet.ServletException
* if an exception has occurred that interferes with the
* servlet's normal operation.
*/
@Override
public void init(javax.servlet.ServletConfig servletConfig)
throws javax.servlet.ServletException {
super.init(servletConfig);
// Loads the application class using the same class loader
// as the servlet itself
// Gets the application class name
final String applicationClassName = servletConfig
.getInitParameter("application");
if (applicationClassName == null) {
String rootParam = servletConfig
.getInitParameter(Application.ROOT_PARAMETER);
// Validate the parameter value
verifyRootClass(rootParam);
// Application can be used if a valid rootLayout is defined
applicationClass = Application.class;
return;
}
try {
applicationClass = (Class<? extends Application>) getClassLoader()
.loadClass(applicationClassName);
} catch (final ClassNotFoundException e) {
throw new ServletException("Failed to load application class: "
+ applicationClassName);
}
}
private void verifyRootClass(String className) throws ServletException {
if (className == null) {
throw new ServletException(Application.ROOT_PARAMETER
+ " servlet parameter not defined");
}
// Check that the root layout class can be found
try {
Class<?> rootClass = getClassLoader().loadClass(className);
if (!Root.class.isAssignableFrom(rootClass)) {
throw new ServletException(className
+ " does not implement Root");
}
// Try finding a default constructor, else throw exception
rootClass.getConstructor();
} catch (ClassNotFoundException e) {
throw new ServletException(className + " could not be loaded", e);
} catch (SecurityException e) {
throw new ServletException("Could not access " + className
+ " class", e);
} catch (NoSuchMethodException e) {
throw new ServletException(className
+ " doesn't have a public no-args constructor");
}
}
@Override
protected Application getNewApplication(HttpServletRequest request)
throws ServletException {
// Creates a new application instance
try {
final Application application = getApplicationClass().newInstance();
return application;
} catch (final IllegalAccessException e) {
throw new ServletException("getNewApplication failed", e);
} catch (final InstantiationException e) {
throw new ServletException("getNewApplication failed", e);
} catch (ClassNotFoundException e) {
throw new ServletException("getNewApplication failed", e);
}
}
@Override
protected Class<? extends Application> getApplicationClass()
throws ClassNotFoundException {
return applicationClass;
}
}
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