/*
    * $Id: ServletContextAdapter.java 674918 2008-07-08 19:10:14Z apetrelli $
    *
    * 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.tiles.web.util;
  
  import java.io.InputStream;
  import java.net.MalformedURLException;
  import java.net.URL;
  import java.util.Enumeration;
  import java.util.Hashtable;
  import java.util.Set;
  
  import javax.servlet.RequestDispatcher;
  import javax.servlet.Servlet;
  import javax.servlet.ServletConfig;
  import javax.servlet.ServletContext;
  import javax.servlet.ServletException;
  
  /***
   * Adapts a servlet config and a servlet context to become a unique servlet
   * context.
   *
   * @version $Rev: 674918 $ $Date: 2008-07-08 21:10:14 +0200 (mar, 08 lug 2008) $
   */
  @SuppressWarnings("deprecation")
  public class ServletContextAdapter implements ServletContext {
  
      /***
       * The root context to use.
       */
      private ServletContext rootContext;
  
      /***
       * The union of init parameters of {@link ServletConfig} and
       * {@link ServletContext}.
       */
      private Hashtable<String, String> initParameters;
  
  
      /***
       * Constructor.
       *
       * @param config The servlet configuration object.
       */
      @SuppressWarnings("unchecked")
      public ServletContextAdapter(ServletConfig config) {
          this.rootContext = config.getServletContext();
          initParameters = new Hashtable<String, String>();
          Enumeration<String> enumeration = rootContext
                  .getInitParameterNames();
          while (enumeration.hasMoreElements()) {
              String paramName = enumeration.nextElement();
              initParameters.put(paramName, rootContext
                      .getInitParameter(paramName));
          }
          enumeration = config.getInitParameterNames();
          while (enumeration.hasMoreElements()) {
              String paramName = enumeration.nextElement();
              initParameters.put(paramName, config.getInitParameter(paramName));
          }
      }
  
      /*** {@inheritDoc} */
      public ServletContext getContext(String string) {
          return rootContext.getContext(string);
      }
  
      /*** {@inheritDoc} */
      public int getMajorVersion() {
          return rootContext.getMajorVersion();
      }
  
      /*** {@inheritDoc} */
      public int getMinorVersion() {
          return rootContext.getMinorVersion();
      }
  
      /*** {@inheritDoc} */
      public String getMimeType(String string) {
          return rootContext.getMimeType(string);
      }
  
     /*** {@inheritDoc} */
     @SuppressWarnings("unchecked")
     public Set getResourcePaths(String string) {
         return rootContext.getResourcePaths(string);
     }
 
     /*** {@inheritDoc} */
     public URL getResource(String string) throws MalformedURLException {
         return rootContext.getResource(string);
     }
 
     /*** {@inheritDoc} */
     public InputStream getResourceAsStream(String string) {
         return rootContext.getResourceAsStream(string);
     }
 
     /*** {@inheritDoc} */
     public RequestDispatcher getRequestDispatcher(String string) {
         return rootContext.getRequestDispatcher(string);
     }
 
     /*** {@inheritDoc} */
     public RequestDispatcher getNamedDispatcher(String string) {
         return rootContext.getNamedDispatcher(string);
     }
 
     /*** {@inheritDoc} */
     public Servlet getServlet(String string) throws ServletException {
         return rootContext.getServlet(string);
     }
 
     /*** {@inheritDoc} */
     @SuppressWarnings({ "unchecked" })
     public Enumeration getServlets() {
         return rootContext.getServlets();  //To change body of implemented methods use File | Settings | File Templates.
     }
 
     /*** {@inheritDoc} */
     @SuppressWarnings({ "unchecked" })
     public Enumeration getServletNames() {
         return rootContext.getServletNames();
     }
 
     /*** {@inheritDoc} */
     public void log(String string) {
         rootContext.log(string);
     }
 
     /*** {@inheritDoc} */
     public void log(Exception exception, String string) {
         rootContext.log(exception, string);
     }
 
     /*** {@inheritDoc} */
     public void log(String string, Throwable throwable) {
         rootContext.log(string, throwable);
     }
 
     /*** {@inheritDoc} */
     public String getRealPath(String string) {
         return rootContext.getRealPath(string);
     }
 
     /*** {@inheritDoc} */
     public String getServerInfo() {
         return rootContext.getServerInfo();
     }
 
     /*** {@inheritDoc} */
     public String getInitParameter(String string) {
         return initParameters.get(string);
     }
 
     /*** {@inheritDoc} */
     @SuppressWarnings("unchecked")
     public Enumeration getInitParameterNames() {
         return initParameters.keys();
     }
 
     /*** {@inheritDoc} */
     public Object getAttribute(String string) {
         return rootContext.getAttribute(string);
     }
 
     /*** {@inheritDoc} */
     @SuppressWarnings("unchecked")
     public Enumeration getAttributeNames() {
         return rootContext.getAttributeNames();
     }
 
     /*** {@inheritDoc} */
     public void setAttribute(String string, Object object) {
         rootContext.setAttribute(string, object);
     }
 
     /*** {@inheritDoc} */
     public void removeAttribute(String string) {
         rootContext.removeAttribute(string);
     }
 
     /*** {@inheritDoc} */
     public String getServletContextName() {
         return rootContext.getServletContextName();
     }
 
     /*** {@inheritDoc} */
     public String getContextPath() {
         return rootContext.getContextPath();
     }
 
     /***
      * Composes an enumeration into a single one.
      */
     @SuppressWarnings("unchecked")
     class CompositeEnumeration implements Enumeration {
 
         /***
          * The first enumeration to consider.
          */
         private Enumeration first;
 
         /***
          * The second enumeration to consider.
          */
         private Enumeration second;
 
 
         /***
          * Constructor.
          *
          * @param first The first enumeration to consider.
          * @param second The second enumeration to consider.
          */
         public CompositeEnumeration(Enumeration first, Enumeration second) {
             this.first = first;
             this.second = second;
         }
 
         /*** {@inheritDoc} */
         public boolean hasMoreElements() {
             return first.hasMoreElements() || second.hasMoreElements();
         }
 
         /*** {@inheritDoc} */
         public Object nextElement() {
             if (first.hasMoreElements()) {
                 return first.nextElement();
             }
 
             return second.nextElement();
         }
     }
 }