mcs/class/Mono.Http/Mono.Http.Configuration/AcceptEncodingSectionHandler.cs

   1 //
   2 // AcceptEncodingSectionHandler.cs
   3 //
   4 // Authors:
   5 //      Gonzalo Paniagua Javier (gonzalo@ximian.com)
   6 //
   7 // (c) 2003 Ximian, Inc (http://www.ximian.com)
   8 //
   9
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30
  31 using System;
  32 using System.Configuration;
  33 using System.IO;
  34 using System.Xml;
  35
  36 namespace Mono.Http.Configuration
  37 {
  38         public class AcceptEncodingSectionHandler : IConfigurationSectionHandler
  39         {
  40                 public object Create (object parent, object configContext, XmlNode section)
  41                 {
  42                         AcceptEncodingConfig cfg = new AcceptEncodingConfig (parent as AcceptEncodingConfig);
  43
  44                         if (section.Attributes != null && section.Attributes.Count != 0)
  45                                 ThrowException ("Unrecognized attribute", section);
  46
  47                         XmlNodeList nodes = section.ChildNodes;
  48                         foreach (XmlNode child in nodes) {
  49                                 XmlNodeType ntype = child.NodeType;
  50                                 if (ntype == XmlNodeType.Whitespace || ntype == XmlNodeType.Comment)
  51                                         continue;
  52
  53                                 if (ntype != XmlNodeType.Element)
  54                                         ThrowException ("Only elements allowed", child);
  55
  56                                 string name = child.Name;
  57                                 if (name == "clear") {
  58                                         if (child.Attributes != null && child.Attributes.Count != 0)
  59                                                 ThrowException ("Unrecognized attribute", child);
  60
  61                                         cfg.Clear ();
  62                                         continue;
  63                                 }
  64
  65                                 if (name != "add")
  66                                         ThrowException ("Unexpected element", child);
  67
  68                                 string encoding = ExtractAttributeValue ("encoding", child, false);
  69                                 string type = ExtractAttributeValue ("type", child, false);
  70                                 string disabled = ExtractAttributeValue ("disabled", child, true);
  71                                 if (disabled != null && disabled == "yes")
  72                                         continue;
  73
  74                                 if (child.Attributes != null && child.Attributes.Count != 0)
  75                                         ThrowException ("Unrecognized attribute", child);
  76
  77                                 cfg.Add (encoding, type);
  78                         }
  79
  80                         return cfg;
  81                 }
  82
  83                 static void ThrowException (string msg, XmlNode node)
  84                 {
  85                         if (node != null && node.Name != String.Empty)
  86                                 msg = msg + " (node name: " + node.Name + ") ";
  87
  88                         throw new ConfigurationException (msg, node);
  89                 }
  90
  91                 static string ExtractAttributeValue (string attKey, XmlNode node, bool optional)
  92                 {
  93                         if (node.Attributes == null) {
  94                                 if (optional)
  95                                         return null;
  96
  97                                 ThrowException ("Required attribute not found: " + attKey, node);
  98                         }
  99
 100                         XmlNode att = node.Attributes.RemoveNamedItem (attKey);
 101                         if (att == null) {
 102                                 if (optional)
 103                                         return null;
 104                                 ThrowException ("Required attribute not found: " + attKey, node);
 105                         }
 106
 107                         string value = att.Value;
 108                         if (value == String.Empty) {
 109                                 string opt = optional ? "Optional" : "Required";
 110                                 ThrowException (opt + " attribute is empty: " + attKey, node);
 111                         }
 112
 113                         return value;
 114                 }
 115         }
 116 }
 117