/*
    * Licensed to the Apache Software Foundation (ASF) under one or more
    * contributor license agreements.  See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * The ASF licenses this file to You 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.apache.jetspeed.request;
  
  import java.lang.reflect.Constructor;
  import java.util.HashMap;
  import java.util.Map;
  
  import javax.servlet.ServletConfig;
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.apache.jetspeed.PortalReservedParameters;
  import org.apache.jetspeed.aggregator.CurrentWorkerContext;
  import org.apache.jetspeed.userinfo.UserInfoManager;
  
  /***
   * JetspeedRequestContextComponent
   *
   * @author <a href="mailto:taylor@apache.org">David Sean Taylor</a>
   * @version $Id: JetspeedRequestContextComponent.java 587064 2007-10-22 11:54:11Z woonsan $
   */
  public class JetspeedRequestContextComponent implements RequestContextComponent
  {
      private String contextClassName = null;
      private Class contextClass = null;
      /*** The user info manager. */
      private UserInfoManager userInfoMgr;
      private ThreadLocal tlRequestContext = new ThreadLocal();
      private Map requestContextObjects;
      
      private final static Log log = LogFactory.getLog(JetspeedRequestContextComponent.class);
  
      public JetspeedRequestContextComponent(String contextClassName)
      {
          this.contextClassName = contextClassName;
          this.requestContextObjects = new HashMap();
      }
  
      public JetspeedRequestContextComponent(String contextClassName, 
                                             UserInfoManager userInfoMgr)
      {
          this.contextClassName = contextClassName;
          this.userInfoMgr = userInfoMgr;
          this.requestContextObjects = new HashMap();        
      }
  
      public JetspeedRequestContextComponent(String contextClassName, 
              UserInfoManager userInfoMgr,
              Map requestContextObjects)
      {
          this.contextClassName = contextClassName;
          this.userInfoMgr = userInfoMgr;
          this.requestContextObjects = requestContextObjects;        
      }
      
      public RequestContext create(HttpServletRequest req, HttpServletResponse resp, ServletConfig config)
      {
          RequestContext context = null;
  
          try
          {
              if (null == contextClass)
              {
                  contextClass = Class.forName(contextClassName);
              }
  
              Constructor constructor =
                  contextClass.getConstructor(
                      new Class[] {
                          HttpServletRequest.class,
                          HttpServletResponse.class,
                          ServletConfig.class,
                          UserInfoManager.class,
                          Map.class});
              context = (RequestContext) constructor.newInstance(new Object[] { req, resp, config, userInfoMgr, requestContextObjects});
                      
          }
          catch (Exception e)
          {
              String msg = "JetspeedRequestContextComponent: Failed to create a Class object for RequestContext: " + e.toString();
              log.error(msg);
          }
         tlRequestContext.set(context);        
         return context;
     }
 
     public void release(RequestContext context)
     {
         tlRequestContext.set(null);
     }
 
     /***
      * The servlet request can always get you back to the Request Context if you need it
      * This static accessor provides this capability
      *
      * @param request
      * @return RequestContext
      */
     public RequestContext getRequestContext(HttpServletRequest request)
     {
         RequestContext rc = (RequestContext) request.getAttribute(PortalReservedParameters.REQUEST_CONTEXT_ATTRIBUTE);
         if(rc != null)
         {
             return rc;
         }
         else
         {
             log.error("Cannot call getRequestContext(HttpServletRequest request) before it has been created and set for this thread.");
             throw new IllegalStateException("Cannot call getRequestContext(HttpServletRequest request) before it has been created and set for this thread.");
         }
     }
     
     public RequestContext getRequestContext()
     {
         RequestContext rc = null;
 
         if (CurrentWorkerContext.getParallelRenderingMode())
         {
             rc = (RequestContext) CurrentWorkerContext.getAttribute(PortalReservedParameters.REQUEST_CONTEXT_ATTRIBUTE);
         }
         else
         {
             rc = (RequestContext) tlRequestContext.get();        
         }
 
         if(rc != null)
         {
             return rc;
         }
         else
         {
             log.error("Cannot call getRequestContext() before it has been created and set for this thread.");
             throw new IllegalStateException("Cannot call getRequestContext() before it has been created and set for this thread.");
         }
     }
 
 }