HttpServletHelper.java

/**********************************************************************************
 * $URL: https://source.sakaiproject.org/svn/metaobj/trunk/metaobj-util/tool-lib/src/java/org/sakaiproject/metaobj/utils/mvc/impl/HttpServletHelper.java $
 * $Id: HttpServletHelper.java 105079 2012-02-24 23:08:11Z ottenhoff@longsight.com $
 ***********************************************************************************
 *
 * Copyright (c) 2004, 2005, 2006, 2008 The Sakai 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.opensource.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.sakaiproject.metaobj.utils.mvc.impl;

import java.util.Enumeration;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;

import javax.servlet.http.HttpServletRequest;

public class HttpServletHelper {
   private static HttpServletHelper ourInstance = null;

   public static HttpServletHelper getInstance() {
      if (ourInstance == null) {
         ourInstance = new HttpServletHelper();
      }

      return ourInstance;
   }

   private HttpServletHelper() {
   }


   public void reloadApplicationMap(HttpServletRequest request, Map map) {

      /*
      for (Iterator keys = map.keySet().iterator(); keys.hasNext();) {
         String key = (String) keys.next();
         if (map.get(key) == null) {
            request.getSession().getServletContext().removeAttribute(key);
         }
         else if (!map.get(key).equals(request.getSession().getServletContext().getAttribute(key))) {
            request.getSession().getServletContext().setAttribute(key,
               map.get(key));
         }
      }

      Enumeration enumer = request.getSession().getServletContext().getAttributeNames();

      while (enumer.hasMoreElements()) {
         String key = (String)enumer.nextElement();

         if (map.get(key) == null) {
            request.getSession().getServletContext().removeAttribute(key);
         }
      }
      */
   }

   public Map createApplicationMap(HttpServletRequest request) {
      Map parameters = new HashMap();
      //Enumeration enumer = request.getSession().getServletContext().getAttributeNames();

      //while (enumer.hasMoreElements()) {
      //   String key = (String) enumer.nextElement();
      //   parameters.put(key, request.getSession().getServletContext().getAttribute(key));
      //}

      return parameters;
   }

   public void reloadSessionMap(HttpServletRequest request, Map map) {
	   for (Iterator entries = map.entrySet().iterator(); entries.hasNext();) {
          Entry entry = (Entry) entries.next();
          String key = (String)entry.getKey();

          if (entry.getValue() == null) {
             request.getSession().removeAttribute(key);
          }
          else if (!entry.getValue().equals(request.getSession().getAttribute(key))) {
             request.getSession().setAttribute(key, entry.getValue());
          }
       }

      Enumeration enumer = request.getSession().getAttributeNames();

      while (enumer.hasMoreElements()) {
         String key = (String) enumer.nextElement();

         if (map.get(key) == null) {
            request.getSession().removeAttribute(key);
         }
      }
   }

   public Map createSessionMap(HttpServletRequest request) {
      Map parameters = new HashMap();
      Enumeration enumer = request.getSession().getAttributeNames();

      while (enumer.hasMoreElements()) {
         String key = (String) enumer.nextElement();
         parameters.put(key, request.getSession().getAttribute(key));
      }

      return parameters;
   }

   public void reloadRequestMap(HttpServletRequest request, Map map) {
	   for (Iterator entries = map.entrySet().iterator(); entries.hasNext();) {
          Entry entry = (Entry)entries.next();
    	  String key = (String) entry.getKey();
          if (entry.getValue() == null) {
             request.removeAttribute(key);
          }
          else if (!map.get(key).equals(request.getAttribute(key))) {
             request.setAttribute(key, entry.getValue());
          }
       }

      Enumeration enumer = request.getAttributeNames();

      while (enumer.hasMoreElements()) {
         String key = (String) enumer.nextElement();

         if (map.get(key) == null) {
            request.removeAttribute(key);
         }
      }
   }

   public Map createRequestMap(HttpServletRequest request) {
      Map parameters = new HashMap();
      Enumeration enumer = request.getAttributeNames();

      while (enumer.hasMoreElements()) {
         String key = (String) enumer.nextElement();
         parameters.put(key, request.getAttribute(key));
      }

      enumer = request.getParameterNames();

      while (enumer.hasMoreElements()) {
         String key = (String) enumer.nextElement();
         if (request.getParameterValues(key).length > 1) {
            parameters.put(key, request.getParameterValues(key));
         }
         else {
            parameters.put(key, request.getParameter(key));
         }
      }

      return parameters;
   }


}