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

   1 //
   2 // ProductInfoHeaderValue.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 ProductInfoHeaderValue : ICloneable
  34         {
  35                 public ProductInfoHeaderValue (ProductHeaderValue product)
  36                 {
  37                         if (product == null)
  38                                 throw new ArgumentNullException ();
  39
  40                         Product = product;
  41                 }
  42
  43                 public ProductInfoHeaderValue (string comment)
  44                 {
  45                         Parser.Token.CheckComment (comment);
  46                         Comment = comment;
  47                 }
  48
  49                 public ProductInfoHeaderValue (string productName, string productVersion)
  50                 {
  51                         Product = new ProductHeaderValue (productName, productVersion);
  52                 }
  53
  54                 private ProductInfoHeaderValue ()
  55                 {
  56                 }
  57
  58                 public string Comment { get; private set; }
  59                 public ProductHeaderValue Product { get; private set; }
  60
  61                 object ICloneable.Clone ()
  62                 {
  63                         return MemberwiseClone ();
  64                 }
  65
  66                 public override bool Equals (object obj)
  67                 {
  68                         var source = obj as ProductInfoHeaderValue;
  69                         if (source == null)
  70                                 return false;
  71
  72                         return Product != null ?
  73                                 Product.Equals (source.Product) :
  74                                 source.Comment == Comment;
  75                 }
  76
  77                 public override int GetHashCode ()
  78                 {
  79                         return Product != null ?
  80                                 Product.GetHashCode () :
  81                                 Comment.GetHashCode ();
  82                 }
  83
  84                 public static ProductInfoHeaderValue Parse (string input)
  85                 {
  86                         ProductInfoHeaderValue value;
  87                         if (TryParse (input, out value))
  88                                 return value;
  89
  90                         throw new FormatException (input);
  91                 }
  92
  93                 public static bool TryParse (string input, out ProductInfoHeaderValue parsedValue)
  94                 {
  95                         parsedValue = null;
  96
  97                         var lexer = new Lexer (input);
  98                         if (!TryParseElement (lexer, out parsedValue) || parsedValue == null)
  99                                 return false;
 100
 101                         if (lexer.Scan () != Token.Type.End) {
 102                                 parsedValue = null;
 103                                 return false;
 104                         }
 105
 106                         return true;
 107                 }
 108
 109                 internal static bool TryParse (string input, int minimalCount, out List<ProductInfoHeaderValue> result)
 110                 {
 111                         var list = new List<ProductInfoHeaderValue> ();
 112                         var lexer = new Lexer (input);
 113                         result = null;
 114
 115                         while (true) {
 116                                 ProductInfoHeaderValue element;
 117                                 if (!TryParseElement (lexer, out element))
 118                                         return false;
 119
 120                                 if (element == null) {
 121                                         if (list != null && minimalCount <= list.Count) {
 122                                                 result = list;
 123                                                 return true;
 124                                         }
 125
 126                                         return false;
 127                                 }
 128
 129                                 list.Add (element);
 130                         }
 131                 }
 132
 133                 static bool TryParseElement (Lexer lexer, out ProductInfoHeaderValue parsedValue)
 134                 {
 135                         string comment;
 136                         parsedValue = null;
 137                         Token t;
 138
 139                         if (lexer.ScanCommentOptional (out comment, out t)) {
 140                                 if (comment == null)
 141                                         return false;
 142
 143                                 parsedValue = new ProductInfoHeaderValue ();
 144                                 parsedValue.Comment = comment;
 145                                 return true;
 146                         }
 147
 148                         if (t == Token.Type.End)
 149                                 return true;
 150
 151                         if (t != Token.Type.Token)
 152                                 return false;
 153
 154                         var value = new ProductHeaderValue ();
 155                         value.Name = lexer.GetStringValue (t);
 156
 157                         t = lexer.Scan ();
 158                         if (t == Token.Type.SeparatorSlash) {
 159                                 t = lexer.Scan ();
 160                                 if (t != Token.Type.Token)
 161                                         return false;
 162
 163                                 value.Version = lexer.GetStringValue (t);
 164                         }
 165
 166                         parsedValue = new ProductInfoHeaderValue (value);
 167                         return true;
 168                 }
 169
 170                 public override string ToString ()
 171                 {
 172                         if (Product == null)
 173                                 return Comment;
 174
 175                         return Product.ToString ();
 176                 }
 177         }
 178 }