class/System.Web/System.Web.UI.WebControls/DataKey.cs

   1 //
   2 // System.Web.UI.WebControls.DataKey.cs
   3 //
   4 // Authors:
   5 //      Lluis Sanchez Gual (lluis@novell.com)
   6 //
   7 // (C) 2005 Novell, Inc (http://www.novell.com)
   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;
  33 using System.Collections;
  34 using System.Collections.Specialized;
  35
  36 namespace System.Web.UI.WebControls
  37 {
  38         public class DataKey : IStateManager
  39         {
  40                 IOrderedDictionary keyTable;
  41                 string[] keyNames;
  42                 bool trackViewState;
  43                 IOrderedDictionary readonlyKeyTable;
  44
  45                 public DataKey (IOrderedDictionary keyTable)
  46                 {
  47                         this.keyTable = keyTable;
  48                 }
  49
  50                 public DataKey (IOrderedDictionary keyTable, string[] keyNames)
  51                 {
  52                         this.keyTable = keyTable;
  53                         this.keyNames = keyNames;
  54                 }
  55
  56                 public virtual object this [int index] {
  57                         get { return keyTable [index]; }
  58                 }
  59
  60                 public virtual object this [string name] {
  61                         get { return keyTable [name]; }
  62                 }
  63
  64                 public virtual object Value {
  65                         get {
  66                                 if (keyTable.Count == 0)
  67                                         return null;
  68                                 return keyTable [0];
  69                         }
  70                 }
  71
  72                 public virtual IOrderedDictionary Values {
  73                         get {
  74                                 if (readonlyKeyTable == null) {
  75                                         if (keyTable is OrderedDictionary)
  76                                                 readonlyKeyTable = ((OrderedDictionary)keyTable).AsReadOnly ();
  77                                         else
  78                                                 readonlyKeyTable = keyTable;
  79                                 }
  80                                 return readonlyKeyTable;
  81                         }
  82                 }
  83
  84                 protected virtual void LoadViewState (object savedState)
  85                 {
  86                         if (savedState is Pair) {
  87                                 Pair p = (Pair) savedState;
  88                                 object[] akeys = (object[]) p.First;
  89                                 object[] avals = (object[]) p.Second;
  90                                 for (int n=0; n<akeys.Length; n++) {
  91                                         keyTable [akeys[n]] = avals [n];
  92                                 }
  93                         } else if (savedState is object[]) {
  94                                 object[] avals = (object[]) savedState;
  95                                 for (int n=0; n<avals.Length; n++)
  96                                         keyTable [keyNames[n]] = avals [n];
  97                         }
  98                 }
  99
 100                 protected virtual object SaveViewState ()
 101                 {
 102                         if (keyTable.Count == 0) return null;
 103
 104                         if (keyNames != null) {
 105                                 object[] avals = new object [keyTable.Count];
 106                                 int n=0;
 107                                 foreach (object val in keyTable.Values)
 108                                         avals [n++] = val;
 109                                 return avals;
 110                         } else {
 111                                 object[] avals = new object [keyTable.Count];
 112                                 object[] akeys = new object [keyTable.Count];
 113                                 int n=0;
 114                                 foreach (DictionaryEntry de in keyTable) {
 115                                         akeys [n] = de.Key;
 116                                         avals [n++] = de.Value;
 117                                 }
 118                                 return new Pair (akeys, avals);
 119                         }
 120                 }
 121
 122                 protected virtual void TrackViewState ()
 123                 {
 124                         trackViewState = true;
 125                 }
 126
 127                 protected virtual bool IsTrackingViewState {
 128                         get { return trackViewState; }
 129                 }
 130
 131                 void IStateManager.LoadViewState (object savedState)
 132                 {
 133                         LoadViewState (savedState);
 134                 }
 135
 136                 object IStateManager.SaveViewState ()
 137                 {
 138                         return SaveViewState ();
 139                 }
 140
 141                 void IStateManager.TrackViewState ()
 142                 {
 143                         TrackViewState ();
 144                 }
 145
 146                 bool IStateManager.IsTrackingViewState {
 147                         get { return IsTrackingViewState; }
 148                 }
 149         }
 150 }
 151 #endif