/**

  * Copyright 2010 The Kuali Foundation Licensed under the

  * Educational Community 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.osedu.org/licenses/ECL-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.kuali.student.common.ws;

 import java.util.Enumeration;

 import java.util.Properties;

 import javax.servlet.Servlet;

 import javax.servlet.ServletConfig;

 import javax.servlet.ServletContext;

 import javax.servlet.http.HttpServletRequest;

 import javax.servlet.http.HttpServletResponse;

 import org.apache.log4j.Logger;

 import org.springframework.beans.factory.BeanNameAware;

 import org.springframework.beans.factory.DisposableBean;

 import org.springframework.beans.factory.InitializingBean;

 import org.springframework.web.servlet.ModelAndView;

 import org.springframework.web.servlet.mvc.AbstractController;

 /**

  * Spring Controller implementation that mimics standard

  * ServletWrappingController behaviour (see its documentation), but with the

  * important difference that it doesn't instantiate the Servlet instance

  * directly but delegate for this the BeanContext, so that we can also use IoC.*

  */

 public class ServletWrappingController extends AbstractController implements

                 BeanNameAware, InitializingBean, DisposableBean {

         private Class<? extends Servlet> servletClass;

         private String servletName;

         private Properties initParameters = new Properties();

         private String beanName;

         private Servlet servletInstance;

         private static org.apache.log4j.Logger log = Logger.getLogger(ServletWrappingController.class);

         public void setServletClass(Class<? extends Servlet> servletClass) {

                 log.info("setServletClass : " + servletClass);

                 this.servletClass = servletClass;

         }

         public void setServletName(String servletName) {

                 log.info("setServletName : " + servletName);

                 this.servletName = servletName;

         }

         public void setInitParameters(Properties initParameters) {

                 log.info("setInitParameters : " + initParameters);

                 this.initParameters = initParameters;

         }

         public void setBeanName(String name) {

                 log.info("setBeanName : " + name);

                 this.beanName = name;

         }

         public void setServletInstance(Servlet servletInstance) {

                 log.info("setServletInstance : " + servletInstance);

                 this.servletInstance = servletInstance;

         }

         public void afterPropertiesSet() throws Exception {

                 log.info("afterPropertiesSet");

                 if (this.servletInstance == null) {

                         throw new IllegalArgumentException("servletInstance is required");

                 }

                 if (!Servlet.class.isAssignableFrom(servletInstance.getClass())) {

                         throw new IllegalArgumentException("servletInstance ["

                                         + this.servletClass.getName()

                                         + "] needs to implement interface [javax.servlet.Servlet]");

                 }

                 if (this.servletName == null) {

                         this.servletName = this.beanName;

                 }

                 this.servletInstance.init(new DelegatingServletConfig());

         }

         protected ModelAndView handleRequestInternal(HttpServletRequest request,

                         HttpServletResponse response) throws Exception {

                 log.info("handleRequestInternal : " + servletName);

                 try{

                         this.servletInstance.service(request, response);

                 }catch(Exception e){

                         log.error(e.getMessage());

                         throw e;

                 }

                 return null;

         }

         public void destroy() {

                 log.info("destroy : " + servletName);

                 this.servletInstance.destroy();

         }

         private class DelegatingServletConfig implements ServletConfig {

                 public String getServletName() {

                         return servletName;

                 }

                 public ServletContext getServletContext() {

                         return getWebApplicationContext().getServletContext();

                 }

                 public String getInitParameter(String paramName) {

                         return initParameters.getProperty(paramName);

                 }

                 public Enumeration<?> getInitParameterNames() {

                         return initParameters.keys();

                 }

         }

 }