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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *   http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing,
13   * software distributed under the License is distributed on an
14   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   * KIND, either express or implied.  See the License for the
16   * specific language governing permissions and limitations
17   * under the License.
18   */
19  package org.apache.myfaces.webapp.filter.servlet;
20  
21  import java.util.ArrayList;
22  import java.util.Enumeration;
23  import java.util.HashMap;
24  import java.util.List;
25  import java.util.Map;
26  
27  import javax.servlet.http.HttpServletRequest;
28  
29  
30  /**
31   * HttpServletRequest header values (multi-value headers) as Map of String[].
32   * 
33   * <p>
34   * NOTE: This class was copied from myfaces impl 
35   * org.apache.myfaces.context.servlet and it is
36   * used by TomahawkFacesContextWrapper. By that reason, it could change
37   * in the future.
38   * </p>
39   * 
40   * @since 1.1.7
41   * @author Anton Koinov (latest modification by $Author: lu4242 $)
42   * @version $Revision: 691871 $ $Date: 2008-09-03 23:32:08 -0500 (Wed, 03 Sep 2008) $
43   */
44  public class RequestHeaderValuesMap extends AbstractAttributeMap
45  {
46      private final HttpServletRequest _httpServletRequest;
47      private final Map                _valueCache = new HashMap();
48  
49      RequestHeaderValuesMap(HttpServletRequest httpServletRequest)
50      {
51          _httpServletRequest = httpServletRequest;
52      }
53  
54      protected Object getAttribute(String key)
55      {
56          Object ret = _valueCache.get(key);
57          if (ret == null)
58          {
59              _valueCache.put(key, ret = toArray(_httpServletRequest
60                  .getHeaders(key)));
61          }
62  
63          return ret;
64      }
65  
66      protected void setAttribute(String key, Object value)
67      {
68          throw new UnsupportedOperationException(
69              "Cannot set HttpServletRequest HeaderValues");
70      }
71  
72      protected void removeAttribute(String key)
73      {
74          throw new UnsupportedOperationException(
75              "Cannot remove HttpServletRequest HeaderValues");
76      }
77  
78      protected Enumeration getAttributeNames()
79      {
80          return _httpServletRequest.getHeaderNames();
81      }
82  
83      private String[] toArray(Enumeration e)
84      {
85          List ret = new ArrayList();
86  
87          while (e.hasMoreElements())
88          {
89              ret.add(e.nextElement());
90          }
91  
92          return (String[]) ret.toArray(new String[ret.size()]);
93      }
94  }