Merge pull request #861 from RobertZenz/patch-1
[mono.git] / mcs / class / System.Net.Http / System.Net.Http.Headers / CollectionExtensions.cs
1 //
2 // CollectionExtensions.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 using System.Linq;
31 using System.Text;
32
33 namespace System.Net.Http.Headers
34 {
35         static class CollectionExtensions
36         {
37                 public static bool SequenceEqual<TSource> (this List<TSource> first, List<TSource> second)
38                 {
39                         if (first == null)
40                                 return second == null || second.Count == 0;
41
42                         if (second == null)
43                                 return first == null || first.Count == 0;
44
45                         return Enumerable.SequenceEqual (first, second);
46                 }
47
48                 public static void SetValue (this List<NameValueHeaderValue> parameters, string key, string value)
49                 {
50                         for (int i = 0; i < parameters.Count; ++i) {
51                                 var entry = parameters[i];
52                                 if (!string.Equals (entry.Name, key, StringComparison.OrdinalIgnoreCase))
53                                         continue;
54
55                                 if (value == null) {
56                                         parameters.RemoveAt (i);
57                                 } else {
58                                         parameters[i].Value = value;
59                                 }
60
61                                 return;
62                         }
63
64                         if (!string.IsNullOrEmpty (value))
65                                 parameters.Add (new NameValueHeaderValue (key, value));
66                 }
67
68                 public static string ToString<T> (this List<T> list)
69                 {
70                         if (list == null || list.Count == 0)
71                                 return null;
72
73                         const string separator = "; ";
74
75                         var sb = new StringBuilder ();
76                         for (int i = 0; i < list.Count; ++i) {
77                                 sb.Append (separator);
78                                 sb.Append (list [i]);
79                         }
80
81                         return sb.ToString ();
82                 }
83
84                 public static void ToStringBuilder<T> (this List<T> list, StringBuilder sb)
85                 {
86                         if (list == null || list.Count == 0)
87                                 return;
88
89                         const string separator = ", ";
90
91                         for (int i = 0; i < list.Count; ++i) {
92                                 if (i > 0) {
93                                         sb.Append (separator);
94                                 }
95
96                                 sb.Append (list[i]);
97                         }
98                 }
99         }
100 }