class/corlib/System.Collections.ObjectModel/Collection.cs

   1 // -*- Mode: csharp; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*-
   2 //
   3 // System.Collections.ObjectModel.Collection
   4 //
   5 // Author:
   6 //    Zoltan Varga (vargaz@gmail.com)
   7 //    David Waite (mass@akuma.org)
   8 //
   9 // (C) 2005 Novell, Inc.
  10 // (C) 2005 David Waite
  11 //
  12
  13 //
  14 // Copyright (C) 2005 Novell, Inc (http://www.novell.com)
  15 // Copyright (C) 2005 David Waite
  16 //
  17 // Permission is hereby granted, free of charge, to any person obtaining
  18 // a copy of this software and associated documentation files (the
  19 // "Software"), to deal in the Software without restriction, including
  20 // without limitation the rights to use, copy, modify, merge, publish,
  21 // distribute, sublicense, and/or sell copies of the Software, and to
  22 // permit persons to whom the Software is furnished to do so, subject to
  23 // the following conditions:
  24 //
  25 // The above copyright notice and this permission notice shall be
  26 // included in all copies or substantial portions of the Software.
  27 //
  28 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  29 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  30 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  31 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  32 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  33 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  34 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  35 //
  36
  37 using System;
  38 using System.Collections;
  39 using System.Collections.Generic;
  40 using System.Runtime.InteropServices;
  41
  42 namespace System.Collections.ObjectModel
  43 {
  44         [ComVisible (false)]
  45         [Serializable]
  46         public class Collection <T> : IList <T>, ICollection <T>, IEnumerable <T>, IList, ICollection, IEnumerable
  47         {
  48                 IList <T> list;
  49                 object syncRoot;
  50
  51                 public Collection ()
  52                 {
  53                         List <T> l = new List <T> ();
  54                         IList l2 = l as IList;
  55                         syncRoot = l2.SyncRoot;
  56                         list = l;
  57                 }
  58
  59                 public Collection (IList <T> list)
  60                 {
  61                         if (list == null)
  62                                 throw new ArgumentNullException ("list");
  63                         this.list = list;
  64                         ICollection l = list as ICollection;
  65                         syncRoot = (l != null) ? l.SyncRoot : new object ();
  66                 }
  67
  68                 public void Add (T item)
  69                 {
  70                         int idx = list.Count;
  71                         InsertItem (idx, item);
  72                 }
  73
  74                 public void Clear ()
  75                 {
  76                         ClearItems ();
  77                 }
  78
  79                 protected virtual void ClearItems ()
  80                 {
  81                         list.Clear ();
  82                 }
  83
  84                 public bool Contains (T item)
  85                 {
  86                         return list.Contains (item);
  87                 }
  88
  89                 public void CopyTo (T [] array, int index)
  90                 {
  91                         list.CopyTo (array, index);
  92                 }
  93
  94                 public IEnumerator <T> GetEnumerator ()
  95                 {
  96                         return list.GetEnumerator ();
  97                 }
  98
  99                 public int IndexOf (T item)
 100                 {
 101                         return list.IndexOf (item);
 102                 }
 103
 104                 public void Insert (int index, T item)
 105                 {
 106                         InsertItem (index, item);
 107                 }
 108
 109                 protected virtual void InsertItem (int index, T item)
 110                 {
 111                         list.Insert (index, item);
 112                 }
 113
 114                 protected IList<T> Items {
 115                         get { return list; }
 116                 }
 117
 118                 public bool Remove (T item)
 119                 {
 120                         int idx = IndexOf (item);
 121                         if (idx == -1)
 122                                 return false;
 123
 124                         RemoveItem (idx);
 125
 126                         return true;
 127                 }
 128
 129                 public void RemoveAt (int index)
 130                 {
 131                         RemoveItem (index);
 132                 }
 133
 134                 protected virtual void RemoveItem (int index)
 135                 {
 136                         list.RemoveAt (index);
 137                 }
 138
 139                 public int Count {
 140                         get { return list.Count; }
 141                 }
 142
 143                 public T this [int index] {
 144                         get { return list [index]; }
 145                         set { SetItem (index, value); }
 146                 }
 147
 148                 bool ICollection<T>.IsReadOnly {
 149                         get { return list.IsReadOnly; }
 150                 }
 151
 152                 protected virtual void SetItem (int index, T item)
 153                 {
 154                         list[index] = item;
 155                 }
 156
 157
 158 #region Helper methods for non-generic interfaces
 159
 160                 internal static bool IsValidItem (object item)
 161                 {
 162                         return (item is T || (item == null && ! typeof (T).IsValueType));
 163                 }
 164
 165                 internal static T ConvertItem (object item)
 166                 {
 167                         if (IsValidItem (item))
 168                                 return (T)item;
 169                         throw new ArgumentException ("item");
 170                 }
 171
 172                 internal static void CheckWritable (IList <T> list)
 173                 {
 174                         if (list.IsReadOnly)
 175                                 throw new NotSupportedException ();
 176                 }
 177
 178                 internal static bool IsSynchronized (IList <T> list)
 179                 {
 180                         ICollection c = list as ICollection;
 181                         return (c != null) ? c.IsSynchronized : false;
 182                 }
 183
 184                 internal static bool IsFixedSize (IList <T> list)
 185                 {
 186                         IList l = list as IList;
 187                         return (l != null) ? l.IsFixedSize : false;
 188                 }
 189 #endregion
 190
 191 #region Not generic interface implementations
 192                 void ICollection.CopyTo (Array array, int index)
 193                 {
 194                         ((ICollection)list).CopyTo (array, index);
 195                 }
 196
 197                 IEnumerator IEnumerable.GetEnumerator ()
 198                 {
 199                         return (IEnumerator) list.GetEnumerator ();
 200                 }
 201
 202                 int IList.Add (object value)
 203                 {
 204                         int idx = list.Count;
 205                         InsertItem (idx, ConvertItem (value));
 206                         return idx;
 207                 }
 208
 209                 bool IList.Contains (object value)
 210                 {
 211                         if (IsValidItem (value))
 212                                 return list.Contains ((T) value);
 213                         return false;
 214                 }
 215
 216                 int IList.IndexOf (object value)
 217                 {
 218                         if (IsValidItem (value))
 219                                 return list.IndexOf ((T) value);
 220                         return -1;
 221                 }
 222
 223                 void IList.Insert (int index, object value)
 224                 {
 225                         InsertItem (index, ConvertItem (value));
 226                 }
 227
 228                 void IList.Remove (object value)
 229                 {
 230                         CheckWritable (list);
 231
 232                         int idx = IndexOf (ConvertItem (value));
 233
 234                         RemoveItem (idx);
 235                 }
 236
 237                 bool ICollection.IsSynchronized {
 238                         get { return IsSynchronized (list); }
 239                 }
 240
 241                 object ICollection.SyncRoot {
 242                         get { return syncRoot; }
 243                 }
 244                 bool IList.IsFixedSize {
 245                         get { return IsFixedSize (list); }
 246                 }
 247
 248                 bool IList.IsReadOnly {
 249                         get { return list.IsReadOnly; }
 250                 }
 251
 252                 object IList.this [int index] {
 253                         get { return list [index]; }
 254                         set { SetItem (index, ConvertItem (value)); }
 255                 }
 256 #endregion
 257         }
 258 }