/**
    * 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();
 		}
 	}
 }