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 using System.Collections.Generic;
  30
  31 namespace System.Net.Http.Headers
  32 {
  33         public class ViaHeaderValue : ICloneable
  34         {
  35                 public ViaHeaderValue (string protocolVersion, string receivedBy)
  36                 {
  37                         Parser.Token.Check (protocolVersion);
  38                         Parser.Uri.Check (receivedBy);
  39
  40                         ProtocolVersion = protocolVersion;
  41                         ReceivedBy = receivedBy;
  42                 }
  43
  44                 public ViaHeaderValue (string protocolVersion, string receivedBy, string protocolName)
  45                         : this (protocolVersion, receivedBy)
  46                 {
  47                         if (!string.IsNullOrEmpty (protocolName)) {
  48                                 Parser.Token.Check (protocolName);
  49                                 ProtocolName = protocolName;
  50                         }
  51                 }
  52
  53                 public ViaHeaderValue (string protocolVersion, string receivedBy, string protocolName, string comment)
  54                         : this (protocolVersion, receivedBy, protocolName)
  55                 {
  56                         if (!string.IsNullOrEmpty (comment)) {
  57                                 Parser.Token.CheckComment (comment);
  58                                 Comment = comment;
  59                         }
  60                 }
  61
  62                 private ViaHeaderValue ()
  63                 {
  64                 }
  65
  66                 public string Comment { get; private set; }
  67                 public string ProtocolName { get; private set; }
  68                 public string ProtocolVersion { get; private set; }
  69                 public string ReceivedBy { get; private set; }
  70
  71                 object ICloneable.Clone ()
  72                 {
  73                         return MemberwiseClone ();
  74                 }
  75
  76                 public override bool Equals (object obj)
  77                 {
  78                         var source = obj as ViaHeaderValue;
  79                         if (source == null)
  80                                 return false;
  81
  82                         return string.Equals (source.Comment, Comment, StringComparison.Ordinal) &&
  83                                 string.Equals (source.ProtocolName, ProtocolName, StringComparison.OrdinalIgnoreCase) &&
  84                                 string.Equals (source.ProtocolVersion, ProtocolVersion, StringComparison.OrdinalIgnoreCase) &&
  85                                 string.Equals (source.ReceivedBy, ReceivedBy, StringComparison.OrdinalIgnoreCase);
  86                 }
  87
  88                 public override int GetHashCode ()
  89                 {
  90                         int hc = ProtocolVersion.ToLowerInvariant ().GetHashCode ();
  91                         hc ^= ReceivedBy.ToLowerInvariant ().GetHashCode ();
  92
  93                         if (!string.IsNullOrEmpty (ProtocolName)) {
  94                                 hc ^= ProtocolName.ToLowerInvariant ().GetHashCode ();
  95                         }
  96
  97                         if (!string.IsNullOrEmpty (Comment)) {
  98                                 hc ^= Comment.GetHashCode ();
  99                         }
 100
 101                         return hc;
 102                 }
 103
 104                 public static ViaHeaderValue Parse (string input)
 105                 {
 106                         ViaHeaderValue value;
 107                         if (TryParse (input, out value))
 108                                 return value;
 109
 110                         throw new FormatException (input);
 111                 }
 112
 113                 public static bool TryParse (string input, out ViaHeaderValue parsedValue)
 114                 {
 115                         var lexer = new Lexer (input);
 116                         Token token;
 117                         if (TryParseElement (lexer, out parsedValue, out token) && token == Token.Type.End)
 118                                 return true;
 119
 120                         parsedValue = null;
 121                         return false;
 122                 }
 123
 124                 internal static bool TryParse (string input, int minimalCount, out List<ViaHeaderValue> result)
 125                 {
 126                         return CollectionParser.TryParse (input, minimalCount, TryParseElement, out result);
 127                 }
 128
 129                 static bool TryParseElement (Lexer lexer, out ViaHeaderValue parsedValue, out Token t)
 130                 {
 131                         parsedValue = null;
 132
 133                         t = lexer.Scan ();
 134                         if (t != Token.Type.Token)
 135                                 return false;
 136
 137                         var next = lexer.Scan ();
 138                         ViaHeaderValue value = new ViaHeaderValue ();
 139
 140                         if (next == Token.Type.SeparatorSlash) {
 141                                 next = lexer.Scan ();
 142                                 if (next != Token.Type.Token)
 143                                         return false;
 144
 145                                 value.ProtocolName = lexer.GetStringValue (t);
 146                                 value.ProtocolVersion = lexer.GetStringValue (next);
 147
 148                                 next = lexer.Scan ();
 149                         } else {
 150                                 value.ProtocolVersion = lexer.GetStringValue (t);
 151                         }
 152
 153                         if (next != Token.Type.Token)
 154                                 return false;
 155
 156                         if (lexer.PeekChar () == ':') {
 157                                 lexer.EatChar ();
 158
 159                                 t = lexer.Scan ();
 160                                 if (t != Token.Type.Token)
 161                                         return false;
 162                         } else {
 163                                 t = next;
 164                         }
 165
 166                         value.ReceivedBy = lexer.GetStringValue (next, t);
 167
 168                         string comment;
 169                         if (lexer.ScanCommentOptional (out comment, out t)) {
 170                                 t = lexer.Scan ();
 171                         }
 172
 173                         value.Comment = comment;
 174                         parsedValue = value;
 175                         return true;
 176                 }
 177
 178                 public override string ToString ()
 179                 {
 180                         string s = ProtocolName != null ?
 181                                 ProtocolName + "/" + ProtocolVersion + " " + ReceivedBy :
 182                                 ProtocolVersion + " " + ReceivedBy;
 183
 184                         return Comment != null ? s + " " + Comment : s;
 185                 }
 186         }
 187 }