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/*
* Copyright 2000-2018 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.server;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import com.vaadin.util.ReflectTools;
public class LegacyVaadinServlet extends VaadinServlet {
private static final UIProvider PROVIDER = new LegacyApplicationUIProvider() {
@Override
protected LegacyApplication createApplication() {
VaadinServlet servlet = VaadinServlet.getCurrent();
if (servlet instanceof LegacyVaadinServlet) {
LegacyVaadinServlet legacyServlet = (LegacyVaadinServlet) servlet;
HttpServletRequest request = VaadinServletService
.getCurrentServletRequest();
try {
if (legacyServlet.shouldCreateApplication(request)) {
return legacyServlet.getNewApplication(request);
}
} catch (ServletException e) {
throw new RuntimeException(e);
}
}
return null;
}
};
@Override
public void init(ServletConfig servletConfig) throws ServletException {
super.init(servletConfig);
getService().addSessionInitListener((SessionInitEvent event) -> {
try {
onVaadinSessionStarted(event.getRequest(), event.getSession());
} catch (ServletException e) {
throw new ServiceException(e);
}
});
}
protected Class<? extends LegacyApplication> getApplicationClass()
throws ClassNotFoundException {
try {
return ServletPortletHelper.getLegacyApplicationClass(getService());
} catch (ServiceException e) {
throw new RuntimeException(e);
}
}
protected LegacyApplication getNewApplication(HttpServletRequest request)
throws ServletException {
try {
Class<? extends LegacyApplication> applicationClass = getApplicationClass();
return ReflectTools.createInstance(applicationClass);
} catch (Exception e) {
throw new ServletException(e);
}
}
protected boolean shouldCreateApplication(HttpServletRequest request)
throws ServletException {
return true;
}
private void onVaadinSessionStarted(VaadinRequest request,
VaadinSession session) throws ServletException {
session.addUIProvider(PROVIDER);
}
}
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