mcs/class/System.Net.Http/System.Net.Http.Headers/ViaHeaderValue.cs

   1 //
   2 // ViaHeaderValue.cs
   3 //
   4 // Authors:
   5 //      Marek Safar  <marek.safar@gmail.com>
   6 //
   7 // Copyright (C) 2011 Xamarin Inc (http://www.xamarin.com)
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27 //
  28
  29 namespace System.Net.Http.Headers
  30 {
  31         public class ViaHeaderValue : ICloneable
  32         {
  33                 public ViaHeaderValue (string protocolVersion, string receivedBy)
  34                 {
  35                         Parser.Token.Check (protocolVersion);
  36                         Parser.Uri.Check (receivedBy);
  37
  38                         ProtocolVersion = protocolVersion;
  39                         ReceivedBy = receivedBy;
  40                 }
  41
  42                 public ViaHeaderValue (string protocolVersion, string receivedBy, string protocolName)
  43                         : this (protocolVersion, receivedBy)
  44                 {
  45                         if (!string.IsNullOrEmpty (protocolName)) {
  46                                 Parser.Token.Check (protocolName);
  47                                 ProtocolName = protocolName;
  48                         }
  49                 }
  50
  51                 public ViaHeaderValue (string protocolVersion, string receivedBy, string protocolName, string comment)
  52                         : this (protocolVersion, receivedBy, protocolName)
  53                 {
  54                         if (!string.IsNullOrEmpty (comment)) {
  55                                 Parser.Token.CheckComment (comment);
  56                                 Comment = comment;
  57                         }
  58                 }
  59
  60                 private ViaHeaderValue ()
  61                 {
  62                 }
  63
  64                 public string Comment { get; private set; }
  65                 public string ProtocolName { get; private set; }
  66                 public string ProtocolVersion { get; private set; }
  67                 public string ReceivedBy { get; private set; }
  68
  69                 object ICloneable.Clone ()
  70                 {
  71                         return MemberwiseClone ();
  72                 }
  73
  74                 public override bool Equals (object obj)
  75                 {
  76                         var source = obj as ViaHeaderValue;
  77                         if (source == null)
  78                                 return false;
  79
  80                         return string.Equals (source.Comment, Comment, StringComparison.Ordinal) &&
  81                                 string.Equals (source.ProtocolName, ProtocolName, StringComparison.OrdinalIgnoreCase) &&
  82                                 string.Equals (source.ProtocolVersion, ProtocolVersion, StringComparison.OrdinalIgnoreCase) &&
  83                                 string.Equals (source.ReceivedBy, ReceivedBy, StringComparison.OrdinalIgnoreCase);
  84                 }
  85
  86                 public override int GetHashCode ()
  87                 {
  88                         int hc = ProtocolVersion.ToLowerInvariant ().GetHashCode ();
  89                         hc ^= ReceivedBy.ToLowerInvariant ().GetHashCode ();
  90
  91                         if (!string.IsNullOrEmpty (ProtocolName)) {
  92                                 hc ^= ProtocolName.ToLowerInvariant ().GetHashCode ();
  93                         }
  94
  95                         if (!string.IsNullOrEmpty (Comment)) {
  96                                 hc ^= Comment.GetHashCode ();
  97                         }
  98
  99                         return hc;
 100                 }
 101
 102                 public static ViaHeaderValue Parse (string input)
 103                 {
 104                         ViaHeaderValue value;
 105                         if (TryParse (input, out value))
 106                                 return value;
 107
 108                         throw new FormatException (input);
 109                 }
 110
 111                 public static bool TryParse (string input, out ViaHeaderValue parsedValue)
 112                 {
 113                         parsedValue = null;
 114
 115                         var lexer = new Lexer (input);
 116
 117                         var t = lexer.Scan ();
 118                         if (t != Token.Type.Token)
 119                                 return false;
 120
 121                         var next = lexer.Scan ();
 122                         ViaHeaderValue value = new ViaHeaderValue ();
 123
 124                         if (next == Token.Type.SeparatorSlash) {
 125                                 next = lexer.Scan ();
 126                                 if (next != Token.Type.Token)
 127                                         return false;
 128
 129                                 value.ProtocolName = lexer.GetStringValue (t);
 130                                 value.ProtocolVersion = lexer.GetStringValue (next);
 131
 132                                 next = lexer.Scan ();
 133                         } else {
 134                                 value.ProtocolVersion = lexer.GetStringValue (t);
 135                         }
 136
 137                         if (next != Token.Type.Token)
 138                                 return false;
 139
 140                         if (lexer.PeekChar () == ':') {
 141                                 lexer.EatChar ();
 142
 143                                 t = lexer.Scan ();
 144                                 if (t != Token.Type.Token)
 145                                         return false;
 146                         } else {
 147                                 t = next;
 148                         }
 149
 150                         value.ReceivedBy = lexer.GetStringValue (next, t);
 151
 152                         string comment;
 153                         if (!lexer.ScanCommentOptional (out comment))
 154                                 return false;
 155
 156                         value.Comment = comment;
 157                         parsedValue = value;
 158                         return true;
 159                 }
 160
 161                 public override string ToString ()
 162                 {
 163                         string s = ProtocolName != null ?
 164                                 ProtocolName + "/" + ProtocolVersion + " " + ReceivedBy :
 165                                 ProtocolVersion + " " + ReceivedBy;
 166
 167                         return Comment != null ? s + " " + Comment : s;
 168                 }
 169         }
 170 }