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

   1 //
   2 // TransferCodingHeaderValue.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 TransferCodingHeaderValue : ICloneable
  34         {
  35                 internal string value;
  36                 internal List<NameValueHeaderValue> parameters;
  37
  38                 public TransferCodingHeaderValue (string value)
  39                 {
  40                         Parser.Token.Check (value);
  41                         this.value = value;
  42                 }
  43
  44                 protected TransferCodingHeaderValue (TransferCodingHeaderValue source)
  45                 {
  46                         this.value = source.value;
  47                         if (source.parameters != null) {
  48                                 foreach (var p in source.parameters) {
  49                                         Parameters.Add (new NameValueHeaderValue (p));
  50                                 }
  51                         }
  52                 }
  53
  54                 internal TransferCodingHeaderValue ()
  55                 {
  56                 }
  57
  58                 public ICollection<NameValueHeaderValue> Parameters {
  59                         get {
  60                                 return parameters ?? (parameters = new List<NameValueHeaderValue> ());
  61                         }
  62                 }
  63
  64                 public string Value {
  65                         get {
  66                                 return value;
  67                         }
  68                 }
  69
  70                 object ICloneable.Clone ()
  71                 {
  72                         return new TransferCodingHeaderValue (this);
  73                 }
  74
  75                 public override bool Equals (object obj)
  76                 {
  77                         var fchv = obj as TransferCodingHeaderValue;
  78                         return fchv != null &&
  79                                 string.Equals (value, fchv.value, StringComparison.OrdinalIgnoreCase) &&
  80                                 parameters.SequenceEqual (fchv.parameters);
  81                 }
  82
  83                 public override int GetHashCode ()
  84                 {
  85                         var hc = value.ToLowerInvariant ().GetHashCode ();
  86                         if (parameters != null)
  87                                 hc ^= HashCodeCalculator.Calculate (parameters);
  88
  89                         return hc;
  90                 }
  91
  92                 public static TransferCodingHeaderValue Parse (string input)
  93                 {
  94                         TransferCodingHeaderValue value;
  95
  96                         if (TryParse (input, out value))
  97                                 return value;
  98
  99                         throw new FormatException (input);
 100                 }
 101
 102                 public override string ToString ()
 103                 {
 104                         return value + CollectionExtensions.ToString (parameters);
 105                 }
 106
 107                 public static bool TryParse (string input, out TransferCodingHeaderValue parsedValue)
 108                 {
 109                         var lexer = new Lexer (input);
 110                         Token token;
 111                         if (TryParseElement (lexer, out parsedValue, out token) && token == Token.Type.End)
 112                                 return true;
 113
 114                         parsedValue = null;
 115                         return false;
 116                 }
 117
 118                 internal static bool TryParse (string input, int minimalCount, out List<TransferCodingHeaderValue> result)
 119                 {
 120                         return CollectionParser.TryParse (input, minimalCount, TryParseElement, out result);
 121                 }
 122
 123                 static bool TryParseElement (Lexer lexer, out TransferCodingHeaderValue parsedValue, out Token t)
 124                 {
 125                         parsedValue = null;
 126
 127                         t = lexer.Scan ();
 128                         if (t != Token.Type.Token)
 129                                 return false;
 130
 131                         var result = new TransferCodingHeaderValue ();
 132                         result.value = lexer.GetStringValue (t);
 133
 134                         t = lexer.Scan ();
 135
 136                         // Parameters parsing
 137                         if (t == Token.Type.SeparatorSemicolon && (!NameValueHeaderValue.TryParseParameters (lexer, out result.parameters, out t) || t != Token.Type.End))
 138                                 return false;
 139
 140                         parsedValue = result;
 141                         return true;
 142                 }
 143         }
 144 }