mcs/class/corlib/System.Collections.ObjectModel/ReadOnlyCollection.cs

   1 // -*- Mode: csharp; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*-
   2 //
   3 // System.Collections.ObjectModel.ReadOnlyCollection
   4 //
   5 // Authors:
   6 //    Zoltan Varga (vargaz@gmail.com)
   7 //    David Waite (mass@akuma.org)
   8 //    Marek Safar (marek.safar@gmail.com)
   9 //
  10 // (C) 2005 Novell, Inc.
  11 // (C) 2005 David Waite
  12 //
  13
  14 //
  15 // Copyright (C) 2005 Novell, Inc (http://www.novell.com)
  16 // Copyright (C) 2005 David Waite
  17 // Copyright (C) 2011 Xamarin, Inc (http://www.xamarin.com)
  18 //
  19 // Permission is hereby granted, free of charge, to any person obtaining
  20 // a copy of this software and associated documentation files (the
  21 // "Software"), to deal in the Software without restriction, including
  22 // without limitation the rights to use, copy, modify, merge, publish,
  23 // distribute, sublicense, and/or sell copies of the Software, and to
  24 // permit persons to whom the Software is furnished to do so, subject to
  25 // the following conditions:
  26 //
  27 // The above copyright notice and this permission notice shall be
  28 // included in all copies or substantial portions of the Software.
  29 //
  30 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  31 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  32 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  33 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  34 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  35 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  36 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  37 //
  38
  39 using System;
  40 using System.Collections.Generic;
  41 using System.Runtime.InteropServices;
  42 using System.Diagnostics;
  43
  44 namespace System.Collections.ObjectModel
  45 {
  46         [ComVisible (false)]
  47         [Serializable]
  48         [DebuggerDisplay ("Count={Count}")]
  49         [DebuggerTypeProxy (typeof (CollectionDebuggerView<>))]
  50         public class ReadOnlyCollection<T> : IList<T>, IList
  51 #if NET_4_5
  52                 , IReadOnlyList<T>
  53 #endif
  54         {
  55                 IList <T> list;
  56
  57                 public ReadOnlyCollection (IList <T> list)
  58                 {
  59                         if (list == null)
  60                                 throw new ArgumentNullException ("list");
  61                         this.list = list;
  62                 }
  63
  64                 void ICollection<T>.Add (T item)
  65                 {
  66                         throw new NotSupportedException ();
  67                 }
  68
  69                 void ICollection<T>.Clear ()
  70                 {
  71                         throw new NotSupportedException ();
  72                 }
  73
  74                 public bool Contains (T value)
  75                 {
  76                         return list.Contains (value);
  77                 }
  78
  79                 public void CopyTo (T [] array, int index)
  80                 {
  81                         list.CopyTo (array, index);
  82                 }
  83
  84                 public IEnumerator <T> GetEnumerator ()
  85                 {
  86                         return list.GetEnumerator ();
  87                 }
  88
  89                 public int IndexOf (T value)
  90                 {
  91                         return list.IndexOf (value);
  92                 }
  93
  94                 void IList<T>.Insert (int index, T item)
  95                 {
  96                         throw new NotSupportedException ();
  97                 }
  98
  99                 bool ICollection<T>.Remove (T item)
 100                 {
 101                         throw new NotSupportedException ();
 102                 }
 103
 104                 void IList<T>.RemoveAt (int index)
 105                 {
 106                         throw new NotSupportedException ();
 107                 }
 108
 109                 public int Count {
 110                         get { return list.Count; }
 111                 }
 112
 113                 protected IList<T> Items {
 114                         get { return list; }
 115                 }
 116
 117                 public T this [int index] {
 118                         get { return list [index]; }
 119                 }
 120
 121                 T IList<T>.this [int index] {
 122                         get { return this [index]; }
 123                         set { throw new NotSupportedException (); }
 124                 }
 125
 126                 bool ICollection<T>.IsReadOnly {
 127                         get { return true; }
 128                 }
 129
 130 #region Not generic interface implementations
 131                 void ICollection.CopyTo (Array array, int index)
 132                 {
 133                         ((ICollection)list).CopyTo (array, index);
 134                 }
 135
 136                 IEnumerator IEnumerable.GetEnumerator ()
 137                 {
 138                         return ((IEnumerable) list).GetEnumerator ();
 139                 }
 140
 141                 int IList.Add (object value)
 142                 {
 143                         throw new NotSupportedException ();
 144                 }
 145
 146                 void IList.Clear ()
 147                 {
 148                         throw new NotSupportedException ();
 149                 }
 150
 151                 bool IList.Contains (object value)
 152                 {
 153                         if (CollectionHelpers.IsValidItem<T> (value))
 154                                 return list.Contains ((T) value);
 155                         return false;
 156                 }
 157
 158                 int IList.IndexOf (object value)
 159                 {
 160                         if (CollectionHelpers.IsValidItem<T> (value))
 161                                 return list.IndexOf ((T) value);
 162                         return -1;
 163                 }
 164
 165                 void IList.Insert (int index, object value)
 166                 {
 167                         throw new NotSupportedException ();
 168                 }
 169
 170                 void IList.Remove (object value)
 171                 {
 172                         throw new NotSupportedException ();
 173                 }
 174
 175                 void IList.RemoveAt (int index)
 176                 {
 177                         throw new NotSupportedException ();
 178                 }
 179
 180                 bool ICollection.IsSynchronized {
 181                         get { return false; }
 182                 }
 183
 184                 object ICollection.SyncRoot {
 185                         get { return this; }
 186                 }
 187
 188                 bool IList.IsFixedSize {
 189                         get { return true; }
 190                 }
 191
 192                 bool IList.IsReadOnly {
 193                         get { return true; }
 194                 }
 195
 196                 object IList.this [int index] {
 197                         get { return list [index]; }
 198                         set { throw new NotSupportedException (); }
 199                 }
 200 #endregion
 201         }
 202 }