mcs/class/corlib/System.Collections.Generic/List.cs

   1 // -*- Mode: csharp; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*-
   2 //
   3 // System.Collections.Generic.List
   4 //
   5 // Author:
   6 //    Martin Baulig (martin@ximian.com)
   7 //
   8 // (C) 2004 Novell, Inc.
   9 //
  10
  11 //
  12 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
  13 //
  14 // Permission is hereby granted, free of charge, to any person obtaining
  15 // a copy of this software and associated documentation files (the
  16 // "Software"), to deal in the Software without restriction, including
  17 // without limitation the rights to use, copy, modify, merge, publish,
  18 // distribute, sublicense, and/or sell copies of the Software, and to
  19 // permit persons to whom the Software is furnished to do so, subject to
  20 // the following conditions:
  21 //
  22 // The above copyright notice and this permission notice shall be
  23 // included in all copies or substantial portions of the Software.
  24 //
  25 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  29 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  30 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  31 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  32 //
  33
  34 #if NET_2_0
  35 using System;
  36 using System.Collections;
  37 using System.Runtime.InteropServices;
  38
  39 namespace System.Collections.Generic
  40 {
  41         [CLSCompliant(false)]
  42         [ComVisible(false)]
  43         public class List<T> : IList<T>, ICollection<T>, IEnumerable<T>,
  44                 IList, ICollection, IEnumerable
  45         {
  46                 protected int count;
  47                 protected int capacity;
  48                 protected T[] contents;
  49                 protected int modified;
  50
  51                 public List ()
  52                 {
  53                 }
  54
  55                 public List (int capacity)
  56                 {
  57                         this.capacity = capacity;
  58                         contents = new T [capacity];
  59                 }
  60
  61                 public List (ICollection collection)
  62                         : this (collection.Count)
  63                 {
  64                         collection.CopyTo (contents, 0);
  65                         count = collection.Count;
  66                 }
  67
  68                 protected void Resize (int size)
  69                 {
  70                         if (size < capacity)
  71                                 return;
  72
  73                         if (size < 10)
  74                                 size = 10;
  75
  76                         T[] ncontents = new T [size];
  77                         if (count > 0)
  78                                 Array.Copy (contents, 0, ncontents, 0, count);
  79
  80                         modified++;
  81                         contents = ncontents;
  82                         capacity = size;
  83                 }
  84
  85                 public void Add (T item)
  86                 {
  87                         if (count >= capacity)
  88                                 Resize (2 * capacity);
  89
  90                         contents [count] = item;
  91                         count++;
  92                 }
  93
  94                 int IList.Add (object item)
  95                 {
  96                         if (count >= capacity)
  97                                 Resize (2 * capacity);
  98
  99                         contents [count] = (T) item;
 100                         return count++;
 101                 }
 102
 103                 public void Clear ()
 104                 {
 105                         count = 0;
 106                 }
 107
 108                 public bool Contains (T item)
 109                 {
 110                         for (int i = 0; i < count; i++)
 111                                 if (contents [i] == item)
 112                                         return true;
 113
 114                         return false;
 115                 }
 116
 117                 bool IList.Contains (object item)
 118                 {
 119                         return Contains ((T) item);
 120                 }
 121
 122                 public int IndexOf (T item)
 123                 {
 124                         for (int i = 0; i < count; i++)
 125                                 if (contents [i] == item)
 126                                         return i;
 127
 128                         return -1;
 129                 }
 130
 131                 int IList.IndexOf (object item)
 132                 {
 133                         return IndexOf ((T) item);
 134                 }
 135
 136                 public void Insert (int index, T item)
 137                 {
 138                         if (index < 0)
 139                                 throw new ArgumentException ();
 140                         if (index > count)
 141                                 index = count;
 142
 143                         Resize (index);
 144                         int rest = count - index;
 145                         if (rest > 0)
 146                                 Array.Copy (contents, index, contents, index+1, rest);
 147                         contents [index] = item;
 148                 }
 149
 150                 void IList.Insert (int index, object item)
 151                 {
 152                         Insert (index, (T) item);
 153                 }
 154
 155                 public bool Remove (T item)
 156                 {
 157                         int index = IndexOf (item);
 158                         if (index < 0)
 159                                 return false;
 160
 161                         RemoveAt (index);
 162                         return true;
 163                 }
 164
 165                 void IList.Remove (object item)
 166                 {
 167                         Remove ((T) item);
 168                 }
 169
 170                 public void RemoveAt (int index)
 171                 {
 172                         if ((index < 0) || (count == 0))
 173                                 throw new ArgumentException ();
 174                         if (index > count)
 175                                 index = count;
 176
 177                         int rest = count - index;
 178                         if (rest > 0)
 179                                 Array.Copy (contents, index+1, contents, index, rest);
 180
 181                         count--;
 182                 }
 183
 184                 public bool IsFixedSize {
 185                         get {
 186                                 return false;
 187                         }
 188                 }
 189
 190                 public bool IsReadOnly {
 191                         get {
 192                                 return false;
 193                         }
 194                 }
 195
 196                 public T this [int index] {
 197                         get {
 198                                 return contents [index];
 199                         }
 200
 201                         set {
 202                                 contents [index] = value;
 203                         }
 204                 }
 205
 206                 object IList.this [int index] {
 207                         get {
 208                                 return contents [index];
 209                         }
 210
 211                         set {
 212                                 // contents [index] = (T) value;
 213                         }
 214                 }
 215
 216                 public void CopyTo (T[] array, int arrayIndex)
 217                 {
 218                         if (count > 0)
 219                                 Array.Copy (contents, 0, array, arrayIndex, count);
 220                 }
 221
 222                 void ICollection.CopyTo (Array array, int arrayIndex)
 223                 {
 224                         if (count > 0)
 225                                 Array.Copy (contents, 0, array, arrayIndex, count);
 226                 }
 227
 228                 public int Count {
 229                         get {
 230                                 return count;
 231                         }
 232                 }
 233
 234                 public bool IsSynchronized {
 235                         get { return false; }
 236                 }
 237
 238                 public object SyncRoot {
 239                         get { return this; }
 240                 }
 241
 242                 public Enumerator GetEnumerator ()
 243                 {
 244                         return new Enumerator (this);
 245                 }
 246
 247                 IEnumerator<T> IEnumerable<T>.GetEnumerator ()
 248                 {
 249                         return new Enumerator (this);
 250                 }
 251
 252                 IEnumerator IEnumerable.GetEnumerator ()
 253                 {
 254                         return new Enumerator (this);
 255                 }
 256
 257                 public struct Enumerator : IEnumerator<T>, IEnumerator
 258                 {
 259                         List<T> list;
 260                         int modified;
 261                         int current;
 262
 263                         public Enumerator (List<T> list)
 264                         {
 265                                 this.list = list;
 266                                 this.modified = list.modified;
 267                                 this.current = -1;
 268                         }
 269
 270                         public T Current {
 271                                 get {
 272                                         if (list.modified != modified)
 273                                                 throw new InvalidOperationException ();
 274                                         if (current < 0)
 275                                                 current = 0;
 276                                         if (current > list.count)
 277                                                 throw new ArgumentException ();
 278                                         return list.contents [current];
 279                                 }
 280                         }
 281
 282                         object IEnumerator.Current {
 283                                 get {
 284                                         return Current;
 285                                 }
 286                         }
 287
 288                         public bool MoveNext ()
 289                         {
 290                                 if (list.modified != modified)
 291                                         throw new InvalidOperationException ();
 292
 293                                 current++;
 294                                 return current < list.count;
 295                         }
 296
 297                         public void Reset ()
 298                         {
 299                                 if (list.modified != modified)
 300                                         throw new InvalidOperationException ();
 301
 302                                 current = -1;
 303                         }
 304
 305                         public void Dispose ()
 306                         {
 307                                 modified = -1;
 308                         }
 309                 }
 310         }
 311 }
 312 #endif