/*
    * Copyright 2007-2012 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.springbyexample.web.servlet.mvc.gwt;
  
  import javax.servlet.ServletContext;
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.springframework.web.context.ServletContextAware;
  import org.springframework.web.servlet.ModelAndView;
  import org.springframework.web.servlet.mvc.Controller;
  
  import com.google.gwt.user.server.rpc.RemoteServiceServlet;
  
  /**
   * Spring Controller that just called GWT's <code>RemoteServiceServlet.doPost(request, response)</code>.
   * 
   * @author David Winterfeldt
   */
  public abstract class GwtController extends RemoteServiceServlet implements Controller, ServletContextAware {
  
      private static final long serialVersionUID = -8355008871464981285L;
  
      final Logger logger = LoggerFactory.getLogger(GwtController.class);
  
      private ServletContext servletContext;
  
      /**
       * Gets <code>ServletContext</code>.
       */
      @Override
      public ServletContext getServletContext() {
          return servletContext;
      }
  
      /**
       * Implementation of <code>ServletContextAware</code>.
       */
      public void setServletContext(ServletContext servletContext) {
          this.servletContext = servletContext;
      }
  
      /**
       * Handles request and delegates to GWT's <code>RemoteServiceServlet.doPost(request, response)</code>.
       */
      public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) 
              throws Exception {
          try {
              logger.debug("Processing handleRequest before.");
              
              doPost(request, response);
              
              logger.debug("Processing handleRequest after.");
              
              return null;
          } catch (Exception e) {
              logger.error("Handle request error '" + e.getMessage() + "'", e);
  
              return null;
          }
      }
  
  }