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

   1 //
   2 // RangeConditionHeaderValue.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.Globalization;
  30
  31 namespace System.Net.Http.Headers
  32 {
  33         public class RangeConditionHeaderValue : ICloneable
  34         {
  35                 public RangeConditionHeaderValue (DateTimeOffset date)
  36                 {
  37                         Date = date;
  38                 }
  39
  40                 public RangeConditionHeaderValue (EntityTagHeaderValue entityTag)
  41                 {
  42                         if (entityTag == null)
  43                                 throw new ArgumentNullException ("entityTag");
  44
  45                         EntityTag = entityTag;
  46                 }
  47
  48                 public RangeConditionHeaderValue (string entityTag)
  49                         : this (new EntityTagHeaderValue (entityTag))
  50                 {
  51                 }
  52
  53                 public DateTimeOffset? Date { get; private set; }
  54                 public EntityTagHeaderValue EntityTag { get; private set; }
  55
  56                 object ICloneable.Clone ()
  57                 {
  58                         return MemberwiseClone ();
  59                 }
  60
  61                 public override bool Equals (object obj)
  62                 {
  63                         var source = obj as RangeConditionHeaderValue;
  64                         if (source == null)
  65                                 return false;
  66
  67                         return EntityTag != null ?
  68                                 EntityTag.Equals (source.EntityTag) :
  69                                 Date == source.Date;
  70                 }
  71
  72                 public override int GetHashCode ()
  73                 {
  74                         return EntityTag != null ? EntityTag.GetHashCode () : Date.GetHashCode ();
  75                 }
  76
  77                 public static RangeConditionHeaderValue Parse (string input)
  78                 {
  79                         RangeConditionHeaderValue value;
  80                         if (TryParse (input, out value))
  81                                 return value;
  82
  83                         throw new FormatException (input);
  84                 }
  85
  86                 public static bool TryParse (string input, out RangeConditionHeaderValue parsedValue)
  87                 {
  88                         parsedValue = null;
  89
  90                         var lexer = new Lexer (input);
  91                         var t = lexer.Scan ();
  92                         bool is_weak;
  93
  94                         if (t == Token.Type.Token) {
  95                                 if (lexer.GetStringValue (t) != "W") {
  96                                         DateTimeOffset date;
  97                                         if (!Lexer.TryGetDateValue (input, out date))
  98                                                 return false;
  99
 100                                         parsedValue = new RangeConditionHeaderValue (date);
 101                                         return true;
 102                                 }
 103
 104                                 if (lexer.PeekChar () != '/')
 105                                         return false;
 106
 107                                 is_weak = true;
 108                                 lexer.EatChar ();
 109                                 t = lexer.Scan ();
 110                         } else {
 111                                 is_weak = false;
 112                         }
 113
 114                         if (t != Token.Type.QuotedString)
 115                                 return false;
 116
 117                         if (lexer.Scan () != Token.Type.End)
 118                                 return false;
 119
 120                         parsedValue = new RangeConditionHeaderValue (
 121                                 new EntityTagHeaderValue () {
 122                                         Tag = lexer.GetStringValue (t),
 123                                         IsWeak = is_weak
 124                                 });
 125
 126                         return true;
 127                 }
 128
 129                 public override string ToString ()
 130                 {
 131                         if (EntityTag != null)
 132                                 return EntityTag.ToString ();
 133
 134                         return Date.Value.ToString ("r", CultureInfo.InvariantCulture);
 135                 }
 136         }
 137 }