org.kani.spring.ApplicationServlet.java Source code

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Here is the source code for org.kani.spring.ApplicationServlet.java

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/*
 * Copyright 2012 the original author or authors.
 *
 * 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 org.kani.spring;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;

import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;

import com.vaadin.Application;
import com.vaadin.terminal.gwt.server.AbstractApplicationServlet;

@SuppressWarnings("serial")
public class ApplicationServlet extends AbstractApplicationServlet {

    private static final String APPLICATION_BEAN_NAME = "kaniAppliction";

    private WebApplicationContext applicationContext;

    private Class<? extends Application> applicationClass;

    @SuppressWarnings("unchecked")
    @Override
    public void init(ServletConfig servletConfig) throws ServletException {
        super.init(servletConfig);

        applicationContext = WebApplicationContextUtils.getWebApplicationContext(servletConfig.getServletContext());
        if (!applicationContext.containsBean(APPLICATION_BEAN_NAME)) {
            throw new IllegalStateException("No application bean with name " + APPLICATION_BEAN_NAME + " found.");
        }

        if (!applicationContext.isTypeMatch(APPLICATION_BEAN_NAME, Application.class)) {
            Object applicationBean = applicationContext.getBean(APPLICATION_BEAN_NAME);
            throw new IllegalStateException(
                    String.format("Application bean has type %s but should be a subtype of %s.",
                            applicationBean.getClass().getName(), Application.class.getName()));
        }
        applicationClass = (Class<? extends Application>) applicationContext.getType(APPLICATION_BEAN_NAME);
    }

    @Override
    protected Class<? extends Application> getApplicationClass() throws ClassNotFoundException {
        return applicationClass;
    }

    @Override
    protected Application getNewApplication(HttpServletRequest request) {
        return (Application) applicationContext.getBean(APPLICATION_BEAN_NAME);
    }
}