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

   1 //
   2 // NameValueHeaderValue.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 NameValueHeaderValue : ICloneable
  34         {
  35                 internal string value;
  36
  37                 public NameValueHeaderValue (string name)
  38                         : this (name, null)
  39                 {
  40                 }
  41
  42                 public NameValueHeaderValue (string name, string value)
  43                 {
  44                         Parser.Token.Check (name);
  45
  46                         this.Name = name;
  47                         this.Value = value;
  48                 }
  49
  50                 protected internal NameValueHeaderValue (NameValueHeaderValue source)
  51                 {
  52                         this.Name = source.Name;
  53                         this.value = source.value;
  54                 }
  55
  56                 internal NameValueHeaderValue ()
  57                 {
  58                 }
  59
  60                 public string Name { get; internal set; }
  61
  62                 public string Value {
  63                         get {
  64                                 return value;
  65                         }
  66                         set {
  67                                 if (!string.IsNullOrEmpty (value)) {
  68                                         var lexer = new Lexer (value);
  69                                         var token = lexer.Scan ();
  70                                         if (lexer.Scan () != Token.Type.End || !(token == Token.Type.Token || token == Token.Type.QuotedString))
  71                                                 throw new FormatException ();
  72
  73                                         value = lexer.GetStringValue (token);
  74                                 }
  75
  76                                 this.value = value;
  77                         }
  78                 }
  79
  80                 internal static NameValueHeaderValue Create (string name, string value)
  81                 {
  82                         return new NameValueHeaderValue () {
  83                                 Name = name,
  84                                 value = value
  85                         };
  86                 }
  87
  88                 object ICloneable.Clone ()
  89                 {
  90                         return new NameValueHeaderValue (this);
  91                 }
  92
  93                 public override int GetHashCode ()
  94                 {
  95                         int hc = Name.ToLowerInvariant ().GetHashCode ();
  96                         if (!string.IsNullOrEmpty (value)) {
  97                                 hc ^= value.ToLowerInvariant ().GetHashCode ();
  98                         }
  99
 100                         return hc;
 101                 }
 102
 103                 public override bool Equals (object obj)
 104                 {
 105                         var source = obj as NameValueHeaderValue;
 106                         if (source == null || !string.Equals (source.Name, Name, StringComparison.OrdinalIgnoreCase))
 107                                 return false;
 108
 109                         if (string.IsNullOrEmpty (value))
 110                                 return string.IsNullOrEmpty (source.value);
 111
 112                         return string.Equals (source.value, value, StringComparison.OrdinalIgnoreCase);
 113                 }
 114
 115                 public static NameValueHeaderValue Parse (string input)
 116                 {
 117                         NameValueHeaderValue value;
 118                         if (TryParse (input, out value))
 119                                 return value;
 120
 121                         throw new FormatException (input);
 122                 }
 123
 124                 internal static bool TryParsePragma (string input, int minimalCount, out List<NameValueHeaderValue> result)
 125                 {
 126                         return CollectionParser.TryParse (input, minimalCount, TryParseElement, out result);
 127                 }
 128
 129                 internal static bool TryParseParameters (Lexer lexer, out List<NameValueHeaderValue> result, out Token t)
 130                 {
 131                         var list = new List<NameValueHeaderValue> ();
 132                         result = null;
 133
 134                         while (true) {
 135                                 var attr = lexer.Scan ();
 136                                 if (attr != Token.Type.Token) {
 137                                         t = Token.Empty;
 138                                         return false;
 139                                 }
 140
 141                                 string value = null;
 142
 143                                 t = lexer.Scan ();
 144                                 if (t == Token.Type.SeparatorEqual) {
 145                                         t = lexer.Scan ();
 146                                         if (t != Token.Type.Token && t != Token.Type.QuotedString)
 147                                                 return false;
 148
 149                                         value = lexer.GetStringValue (t);
 150
 151                                         t = lexer.Scan ();
 152                                 }
 153
 154                                 list.Add (new NameValueHeaderValue () {
 155                                         Name = lexer.GetStringValue (attr),
 156                                         value = value
 157                                 });
 158
 159                                 if (t == Token.Type.SeparatorSemicolon)
 160                                         continue;
 161
 162                                 result = list;
 163                                 return true;
 164                         }
 165                 }
 166
 167                 public override string ToString ()
 168                 {
 169                         if (string.IsNullOrEmpty (value))
 170                                 return Name;
 171
 172                         return Name + "=" + value;
 173                 }
 174
 175                 public static bool TryParse (string input, out NameValueHeaderValue parsedValue)
 176                 {
 177                         var lexer = new Lexer (input);
 178                         Token token;
 179                         if (TryParseElement (lexer, out parsedValue, out token) && token == Token.Type.End)
 180                                 return true;
 181
 182                         parsedValue = null;
 183                         return false;
 184                 }
 185
 186                 static bool TryParseElement (Lexer lexer, out NameValueHeaderValue parsedValue, out Token t)
 187                 {
 188                         parsedValue = null;
 189
 190                         t = lexer.Scan ();
 191                         if (t != Token.Type.Token)
 192                                 return false;
 193
 194                         parsedValue = new NameValueHeaderValue () {
 195                                 Name = lexer.GetStringValue (t),
 196                         };
 197
 198                         t = lexer.Scan ();
 199                         if (t == Token.Type.SeparatorEqual) {
 200                                 t = lexer.Scan ();
 201
 202                                 if (t == Token.Type.Token || t == Token.Type.QuotedString) {
 203                                         parsedValue.value = lexer.GetStringValue (t);
 204                                         t = lexer.Scan ();
 205                                 } else {
 206                                         return false;
 207                                 }
 208                         }
 209
 210                         return true;
 211                 }
 212         }
 213 }