/*
* Copyright 2011 Vaadin Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.vaadin.terminal.gwt.server;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import com.vaadin.Application;
/**
* This servlet connects a Vaadin Application to Web.
*
* @author IT Mill Ltd.
* @version
* 6.7.1
* @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.
*/
@SuppressWarnings("unchecked")
@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) {
throw new ServletException(
"Application not specified in servlet parameters");
}
try {
applicationClass = (Class<? extends Application>) getClassLoader()
.loadClass(applicationClassName);
} catch (final ClassNotFoundException e) {
throw new ServletException("Failed to load application class: "
+ applicationClassName);
}
}
@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;
}
}