/*
    * Copyright 2011 FatWire Corporation. All Rights Reserved.
    *
    * 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 com.fatwire.gst.foundation.controller.support;
  
  import javax.servlet.ServletContext;
  
  import org.apache.commons.logging.Log;
  
  import com.fatwire.gst.foundation.controller.AppContext;
  import com.fatwire.gst.foundation.facade.logging.LogUtil;
  
  /**
   * @author Dolf.Dijkstra
   * @since 4 April 2012
   */
  public class WebContextUtil {
  
      protected static final Log LOG = LogUtil.getLog(WebContextUtil.class);
      private WebContextUtil() {
          super();
      }
  
      public static AppContext getWebAppContext(ServletContext ctx) {
          Object o = ctx.getAttribute(WebAppContext.WEB_CONTEXT_NAME);
          if (o == null) {
              LOG.trace("Configuring WebAppContext from WebContextUtil; it is not explicitly configured in web.xml. Using default setup!");
              return new WebAppContextLoader().configureWebAppContext(ctx);
          }
          if (o instanceof AppContext) {
              return (AppContext) o;
          }
  
          throw new IncompleteConfigurationException("There was no " + WebAppContext.WEB_CONTEXT_NAME
                  + " object in the ServletContext found. Is the WebAppContextLoader listener configured in web.xml?");
      }
  
  }