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 int Add (T item)
  86                 {
  87                         if (count >= capacity)
  88                                 Resize (2 * capacity);
  89
  90                         contents [count] = item;
  91                         return count++;
  92                 }
  93
  94                 int IList.Add (object item)
  95                 {
  96                         return Add ((T) item);
  97                 }
  98
  99                 public void Clear ()
 100                 {
 101                         count = 0;
 102                 }
 103
 104                 public bool Contains (T item)
 105                 {
 106                         for (int i = 0; i < count; i++)
 107                                 if (contents [i] == item)
 108                                         return true;
 109
 110                         return false;
 111                 }
 112
 113                 bool IList.Contains (object item)
 114                 {
 115                         return Contains ((T) item);
 116                 }
 117
 118                 public int IndexOf (T item)
 119                 {
 120                         for (int i = 0; i < count; i++)
 121                                 if (contents [i] == item)
 122                                         return i;
 123
 124                         return -1;
 125                 }
 126
 127                 int IList.IndexOf (object item)
 128                 {
 129                         return IndexOf ((T) item);
 130                 }
 131
 132                 public void Insert (int index, T item)
 133                 {
 134                         if (index < 0)
 135                                 throw new ArgumentException ();
 136                         if (index > count)
 137                                 index = count;
 138
 139                         Resize (index);
 140                         int rest = count - index;
 141                         if (rest > 0)
 142                                 Array.Copy (contents, index, contents, index+1, rest);
 143                         contents [index] = item;
 144                 }
 145
 146                 void IList.Insert (int index, object item)
 147                 {
 148                         Insert (index, (T) item);
 149                 }
 150
 151                 public void Remove (T item)
 152                 {
 153                         int index = IndexOf (item);
 154                         if (index >= 0)
 155                                 RemoveAt (index);
 156                 }
 157
 158                 void IList.Remove (object item)
 159                 {
 160                         Remove ((T) item);
 161                 }
 162
 163                 public void RemoveAt (int index)
 164                 {
 165                         if ((index < 0) || (count == 0))
 166                                 throw new ArgumentException ();
 167                         if (index > count)
 168                                 index = count;
 169
 170                         int rest = count - index;
 171                         if (rest > 0)
 172                                 Array.Copy (contents, index+1, contents, index, rest);
 173
 174                         count--;
 175                 }
 176
 177                 public bool IsFixedSize {
 178                         get {
 179                                 return false;
 180                         }
 181                 }
 182
 183                 public bool IsReadOnly {
 184                         get {
 185                                 return false;
 186                         }
 187                 }
 188
 189                 public T this [int index] {
 190                         get {
 191                                 return contents [index];
 192                         }
 193
 194                         set {
 195                                 contents [index] = value;
 196                         }
 197                 }
 198
 199                 object IList.this [int index] {
 200                         get {
 201                                 return contents [index];
 202                         }
 203
 204                         set {
 205                                 // contents [index] = (T) value;
 206                         }
 207                 }
 208
 209                 public void CopyTo (T[] array, int arrayIndex)
 210                 {
 211                         if (count > 0)
 212                                 Array.Copy (contents, 0, array, arrayIndex, count);
 213                 }
 214
 215                 void ICollection.CopyTo (Array array, int arrayIndex)
 216                 {
 217                         if (count > 0)
 218                                 Array.Copy (contents, 0, array, arrayIndex, count);
 219                 }
 220
 221                 public int Count {
 222                         get {
 223                                 return count;
 224                         }
 225                 }
 226
 227                 public bool IsSynchronized {
 228                         get { return false; }
 229                 }
 230
 231                 public object SyncRoot {
 232                         get { return this; }
 233                 }
 234
 235                 public IEnumerator<T> GetEnumerator ()
 236                 {
 237                         return new Enumerator (this);
 238                 }
 239
 240                 IEnumerator IEnumerable.GetEnumerator ()
 241                 {
 242                         return new Enumerator (this);
 243                 }
 244
 245                 protected class Enumerator : IEnumerator<T>, IEnumerator
 246                 {
 247                         List<T> list;
 248                         int modified;
 249                         int current;
 250
 251                         public Enumerator (List<T> list)
 252                         {
 253                                 this.list = list;
 254                                 this.modified = list.modified;
 255                                 this.current = -1;
 256                         }
 257
 258                         public T Current {
 259                                 get {
 260                                         if (list.modified != modified)
 261                                                 throw new InvalidOperationException ();
 262                                         if (current < 0)
 263                                                 current = 0;
 264                                         if (current > list.count)
 265                                                 throw new ArgumentException ();
 266                                         return list.contents [current];
 267                                 }
 268                         }
 269
 270                         object IEnumerator.Current {
 271                                 get {
 272                                         return Current;
 273                                 }
 274                         }
 275
 276                         public bool MoveNext ()
 277                         {
 278                                 if (list.modified != modified)
 279                                         throw new InvalidOperationException ();
 280
 281                                 current++;
 282                                 return current < list.count;
 283                         }
 284
 285                         public void Reset ()
 286                         {
 287                                 if (list.modified != modified)
 288                                         throw new InvalidOperationException ();
 289
 290                                 current = -1;
 291                         }
 292
 293                         public void Dispose ()
 294                         {
 295                                 modified = -1;
 296                         }
 297                 }
 298         }
 299 }
 300 #endif