mcs/class/System.Web/System.Web.UI/StateManagedCollection.cs

   1 //
   2 // System.Web.UI.StateManagedCollection
   3 //
   4 // Authors:
   5 //      Ben Maurer (bmaurer@users.sourceforge.net)
   6 //
   7 // (C) 2003 Ben Maurer
   8 //
   9
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30
  31 #if NET_2_0
  32 using System.Collections;
  33 using System.Collections.Specialized;
  34 using System.Text;
  35
  36 namespace System.Web.UI {
  37         public abstract class StateManagedCollection : IList, IStateManager {
  38
  39                 protected abstract object CreateKnownType (int index);
  40                 protected abstract void SetDirtyObject (object o);
  41                 protected virtual Type [] GetKnownTypes ()
  42                 {
  43                         return null;
  44                 }
  45
  46                 #region OnXXX
  47                 protected virtual void OnClear ()
  48                 {
  49                 }
  50
  51                 protected virtual void OnClearComplete ()
  52                 {
  53                 }
  54
  55                 protected virtual void OnInsert (int index, object value)
  56                 {
  57                 }
  58
  59                 protected virtual void OnInsertComplete (int index, object value)
  60                 {
  61                 }
  62
  63                 protected virtual void OnRemove (int index, object value)
  64                 {
  65                 }
  66
  67                 protected virtual void OnRemoveComplete (int index, object value)
  68                 {
  69                 }
  70
  71                 protected virtual void OnValidate (object value)
  72                 {
  73                         if (value == null)
  74                                 throw new ArgumentNullException ("value");
  75                 }
  76                 #endregion
  77
  78                 #region IStateManager
  79                 void IStateManager.LoadViewState (object savedState)
  80                 {
  81                         int pos = -1;
  82                         foreach (Pair p in (ArrayList)savedState) {
  83                                 pos ++;
  84
  85                                 if (p == null)
  86                                         continue;
  87                                 IStateManager itm;
  88
  89                                 if (p.Second is Type)
  90                                         itm = (IStateManager) Activator.CreateInstance ((Type) p.Second);
  91                                 else
  92                                         itm = (IStateManager) CreateKnownType ((int) p.Second);
  93
  94                                 itm.LoadViewState (p.First);
  95
  96                                 if (pos >= Count)
  97                                         items.Add (itm);
  98                                 else
  99                                         items [pos] = itm;
 100
 101                         }
 102                 }
 103
 104                 object IStateManager.SaveViewState ()
 105                 {
 106                         ArrayList saved = new ArrayList ();
 107                         Type [] knownTypes = GetKnownTypes ();
 108
 109                         foreach (IStateManager itm in items) {
 110                                 object state = itm.SaveViewState ();
 111                                 if (state == null && !saveEverything) {
 112                                         saved.Add (null);
 113                                         continue;
 114                                 }
 115
 116                                 Pair p = new Pair ();
 117                                 p.First = state;
 118
 119                                 Type t = itm.GetType ();
 120                                 int idx = -1;
 121                                 if (knownTypes != null)
 122                                         idx = Array.IndexOf (knownTypes, t);
 123
 124                                 if (idx != -1)
 125                                         p.Second = idx;
 126                                 else
 127                                         p.Second = t;
 128
 129                                 saved.Add (p);
 130                         }
 131
 132                         return saved;
 133                 }
 134
 135                 void IStateManager.TrackViewState ()
 136                 {
 137                         isTrackingViewState = true;
 138
 139                         foreach (IStateManager i in items)
 140                                 i.TrackViewState ();
 141                 }
 142
 143                 bool isTrackingViewState;
 144                 bool IStateManager.IsTrackingViewState {
 145                         get { return isTrackingViewState; }
 146                 }
 147                 #endregion
 148
 149                 #region ICollection, IList, IEnumerable
 150
 151                 public void Clear ()
 152                 {
 153                         this.OnClear ();
 154                         items.Clear ();
 155                         this.OnClearComplete ();
 156
 157                         SetSaveEverything ();
 158                 }
 159
 160                 public int IndexOf (object o)
 161                 {
 162                         if (o == null)
 163                                 return -1;
 164                         return items.IndexOf (o);
 165                 }
 166
 167                 public bool Contains (object o)
 168                 {
 169                         return o != null && items.Contains (o);
 170                 }
 171
 172                 public IEnumerator GetEnumerator ()
 173                 {
 174                         return items.GetEnumerator ();
 175                 }
 176
 177                 void System.Collections.ICollection.CopyTo (Array array, int index)
 178                 {
 179                         items.CopyTo (array, index);
 180                 }
 181
 182                 IEnumerator IEnumerable.GetEnumerator ()
 183                 {
 184                         return GetEnumerator ();
 185                 }
 186
 187                 int IList.Add (object value)
 188                 {
 189                         OnValidate(value);
 190                         if (isTrackingViewState) {
 191                                 ((IStateManager) value).TrackViewState ();
 192                                 SetDirtyObject (value);
 193                         }
 194
 195                         OnInsert (-1, value);
 196                         items.Add (value);
 197                         OnInsertComplete (-1, value);
 198
 199                         return Count - 1;
 200                 }
 201
 202                 void IList.Insert (int index, object value)
 203                 {
 204                         OnValidate(value);
 205                         if (isTrackingViewState) {
 206                                 ((IStateManager) value).TrackViewState ();
 207                                 SetDirtyObject (value);
 208                         }
 209
 210                         OnInsert (index, value);
 211                         items.Insert (index, value);
 212                         OnInsertComplete(index, value);
 213
 214                         SetSaveEverything ();
 215                 }
 216
 217                 void IList.Remove (object value)
 218                 {
 219                         if (value == null)
 220                                 return;
 221                         OnValidate (value);
 222                         ((IList)this).RemoveAt (IndexOf (value));
 223                 }
 224                 void IList.RemoveAt (int index)
 225                 {
 226                         object o = items [index];
 227
 228                         OnRemove (index, o);
 229                         items.RemoveAt (index);
 230                         OnRemoveComplete(index, o);
 231
 232                         SetSaveEverything ();
 233                 }
 234
 235                 void IList.Clear ()
 236                 {
 237                         this.Clear ();
 238                 }
 239
 240                 bool IList.Contains (object value)
 241                 {
 242                         if (value == null)
 243                                 return false;
 244
 245                         OnValidate (value);
 246                         return Contains (value);
 247                 }
 248
 249                 int IList.IndexOf (object value)
 250                 {
 251                         if (value == null)
 252                                 return -1;
 253
 254                         OnValidate (value);
 255                         return IndexOf (value);
 256                 }
 257
 258                 public int Count {
 259                         get { return items.Count; }
 260                 }
 261
 262                 int ICollection.Count {
 263                         get { return items.Count; }
 264                 }
 265
 266                 bool ICollection.IsSynchronized {
 267                         get { return false; }
 268                 }
 269
 270                 object ICollection.SyncRoot {
 271                         get { return this; }
 272                 }
 273
 274                 bool IList.IsFixedSize {
 275                         get { return false; }
 276                 }
 277
 278                 bool IList.IsReadOnly {
 279                         get { return false; }
 280                 }
 281
 282                 object IList.this [int index] {
 283                         get { return items [index]; }
 284                         set {
 285                                 if (index < 0 || index >= Count)
 286                                         throw new ArgumentOutOfRangeException ("index");
 287
 288                                 OnValidate (value);
 289                                 if (isTrackingViewState) {
 290                                         ((IStateManager) value).TrackViewState ();
 291                                         SetDirtyObject (value);
 292                                 }
 293
 294                                 items [index] = value;
 295                         }
 296                 }
 297                 #endregion
 298
 299                 ArrayList items = new ArrayList ();
 300
 301                 bool saveEverything = false;
 302                 void SetSaveEverything ()
 303                 {
 304                         if (isTrackingViewState)
 305                                 saveEverything = true;
 306                 }
 307         }
 308 }
 309 #endif
 310