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

   1 //
   2 // MediaTypeHeaderValue.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 MediaTypeHeaderValue : ICloneable
  34         {
  35                 internal List<NameValueHeaderValue> parameters;
  36                 internal string media_type;
  37
  38                 public MediaTypeHeaderValue (string mediaType)
  39                 {
  40                         MediaType = mediaType;
  41                 }
  42
  43                 protected MediaTypeHeaderValue (MediaTypeHeaderValue source)
  44                 {
  45                         if (source == null)
  46                                 throw new ArgumentNullException ("source");
  47
  48                         media_type = source.media_type;
  49                         if (source.parameters != null) {
  50                                 foreach (var item in source.parameters)
  51                                         Parameters.Add (new NameValueHeaderValue (item));
  52                         }
  53                 }
  54
  55                 internal MediaTypeHeaderValue ()
  56                 {
  57                 }
  58
  59                 public string CharSet {
  60                         get {
  61                                 if (parameters == null)
  62                                         return null;
  63
  64                                 var found = parameters.Find (l => string.Equals (l.Name, "charset", StringComparison.OrdinalIgnoreCase));
  65                                 if (found == null)
  66                                         return null;
  67
  68                                 return found.Value;
  69                         }
  70
  71                         set {
  72                                 if (parameters == null)
  73                                         parameters = new List<NameValueHeaderValue> ();
  74
  75                                 parameters.SetValue ("charset", value);
  76                         }
  77                 }
  78
  79                 public string MediaType {
  80                         get {
  81                                 return media_type;
  82                         }
  83                         set {
  84                                 if (value == null)
  85                                         throw new ArgumentNullException ("MediaType");
  86
  87                                 string temp;
  88                                 var token = TryParseMediaType (new Lexer (value), out temp);
  89                                 if (token == null || token.Value.Kind != Token.Type.End)
  90                                         throw new FormatException ();
  91
  92                                 media_type = temp;
  93                         }
  94                 }
  95
  96                 public ICollection<NameValueHeaderValue> Parameters {
  97                         get {
  98                                 return parameters ?? (parameters = new List<NameValueHeaderValue> ());
  99                         }
 100                 }
 101
 102                 object ICloneable.Clone ()
 103                 {
 104                         return new MediaTypeHeaderValue (this);
 105                 }
 106
 107                 public override bool Equals (object obj)
 108                 {
 109                         var source = obj as MediaTypeHeaderValue;
 110                         if (source == null)
 111                                 return false;
 112
 113                         return string.Equals (source.media_type, media_type, StringComparison.OrdinalIgnoreCase) &&
 114                                 source.parameters.SequenceEqual (parameters);
 115                 }
 116
 117                 public override int GetHashCode ()
 118                 {
 119                         return media_type.ToLowerInvariant ().GetHashCode () ^ HashCodeCalculator.Calculate (parameters);
 120                 }
 121
 122                 public static MediaTypeHeaderValue Parse (string input)
 123                 {
 124                         MediaTypeHeaderValue value;
 125                         if (TryParse (input, out value))
 126                                 return value;
 127
 128                         throw new FormatException (input);
 129                 }
 130
 131                 public override string ToString ()
 132                 {
 133                         if (parameters == null)
 134                                 return media_type;
 135
 136                         return media_type + CollectionExtensions.ToString (parameters);
 137                 }
 138
 139                 public static bool TryParse (string input, out MediaTypeHeaderValue parsedValue)
 140                 {
 141                         parsedValue = null;
 142
 143                         var lexer = new Lexer (input);
 144
 145                         string media;
 146                         List<NameValueHeaderValue> parameters = null;
 147                         var token = TryParseMediaType (lexer, out media);
 148                         if (token == null)
 149                                 return false;
 150
 151                         switch (token.Value.Kind) {
 152                         case Token.Type.SeparatorSemicolon:
 153                                 Token t;
 154                                 if (!NameValueHeaderValue.TryParseParameters (lexer, out parameters, out t) || t != Token.Type.End)
 155                                         return false;
 156                                 break;
 157                         case Token.Type.End:
 158                                 break;
 159                         default:
 160                                 return false;
 161                         }
 162
 163                         parsedValue = new MediaTypeHeaderValue () {
 164                                 media_type = media,
 165                                 parameters = parameters
 166                         };
 167
 168                         return true;
 169                 }
 170
 171                 internal static Token? TryParseMediaType (Lexer lexer, out string media)
 172                 {
 173                         media = null;
 174
 175                         var token = lexer.Scan ();
 176                         if (token != Token.Type.Token)
 177                                 return null;
 178
 179                         if (lexer.Scan () != Token.Type.SeparatorSlash)
 180                                 return null;
 181
 182                         var token2 = lexer.Scan ();
 183                         if (token2 != Token.Type.Token)
 184                                 return null;
 185
 186                         media = lexer.GetStringValue (token) + "/" + lexer.GetStringValue (token2);
 187
 188                         return lexer.Scan ();
 189                 }
 190         }
 191 }