mcs/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) 2005-2010 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 using System;
  31 using System.Collections;
  32 using System.Collections.Specialized;
  33
  34 namespace System.Web.UI.WebControls
  35 {
  36         public class DataKey : IStateManager
  37         , IEquatable <DataKey>
  38         {
  39                 IOrderedDictionary keyTable;
  40                 string[] keyNames;
  41                 bool trackViewState;
  42                 IOrderedDictionary readonlyKeyTable;
  43
  44                 public DataKey (IOrderedDictionary keyTable)
  45                         : this (keyTable, null)
  46                 {
  47                 }
  48
  49                 public DataKey (IOrderedDictionary keyTable, string[] keyNames)
  50                 {
  51                         this.keyTable = keyTable;
  52                         this.keyNames = keyNames;
  53                 }
  54
  55                 public virtual object this [int index] {
  56                         get { return keyTable [index]; }
  57                 }
  58
  59                 public virtual object this [string name] {
  60                         get { return keyTable [name]; }
  61                 }
  62
  63                 public virtual object Value {
  64                         get {
  65                                 if (keyTable.Count == 0)
  66                                         return null;
  67                                 return keyTable [0];
  68                         }
  69                 }
  70
  71                 public virtual IOrderedDictionary Values {
  72                         get {
  73                                 if (readonlyKeyTable == null) {
  74                                         if (keyTable is OrderedDictionary)
  75                                                 readonlyKeyTable = ((OrderedDictionary)keyTable).AsReadOnly ();
  76                                         else
  77                                                 readonlyKeyTable = keyTable;
  78                                 }
  79                                 return readonlyKeyTable;
  80                         }
  81                 }
  82                 public bool Equals (DataKey other)
  83                 {
  84                         if (other == null)
  85                                 return false;
  86
  87                         IOrderedDictionary otherKeyTable = other.keyTable;
  88                         if (keyTable != null && otherKeyTable != null) {
  89                                 if (keyTable.Count != otherKeyTable.Count)
  90                                         return false;
  91
  92                                 object thisValue, otherValue;
  93
  94                                 foreach (object key in keyTable.Keys) {
  95                                         if (!otherKeyTable.Contains (key))
  96                                                 return false;
  97
  98                                         thisValue = keyTable [key];
  99                                         otherValue = otherKeyTable [key];
 100
 101                                         if (thisValue == null ^ otherValue == null)
 102                                                 return false;
 103
 104                                         if (!thisValue.Equals (otherValue))
 105                                                 return false;
 106                                 }
 107                         }
 108
 109                         string[] otherKeyNames = other.keyNames;
 110                         if (keyNames != null && otherKeyNames != null) {
 111                                 int len = keyNames.Length;
 112                                 if (len != otherKeyNames.Length)
 113                                         return false;
 114
 115                                 for (int i = 0; i < len; i++)
 116                                         if (String.Compare (keyNames [i], otherKeyNames [i], StringComparison.Ordinal) != 0)
 117                                                 return false;
 118                         } else if (keyNames == null ^ otherKeyNames == null)
 119                                 return false;
 120
 121                         return true;
 122                 }
 123                 protected virtual void LoadViewState (object savedState)
 124                 {
 125                         if (savedState is Pair) {
 126                                 Pair p = (Pair) savedState;
 127                                 object[] akeys = (object[]) p.First;
 128                                 object[] avals = (object[]) p.Second;
 129                                 for (int n=0; n<akeys.Length; n++) {
 130                                         keyTable [akeys[n]] = avals [n];
 131                                 }
 132                         } else if (savedState is object[]) {
 133                                 object[] avals = (object[]) savedState;
 134                                 for (int n=0; n<avals.Length; n++)
 135                                         keyTable [keyNames[n]] = avals [n];
 136                         }
 137                 }
 138
 139                 protected virtual object SaveViewState ()
 140                 {
 141                         if (keyTable.Count == 0)
 142                                 return null;
 143
 144                         if (keyNames != null) {
 145                                 object[] avals = new object [keyTable.Count];
 146                                 int n=0;
 147                                 foreach (object val in keyTable.Values)
 148                                         avals [n++] = val;
 149                                 return avals;
 150                         } else {
 151                                 object[] avals = new object [keyTable.Count];
 152                                 object[] akeys = new object [keyTable.Count];
 153                                 int n=0;
 154                                 foreach (DictionaryEntry de in keyTable) {
 155                                         akeys [n] = de.Key;
 156                                         avals [n++] = de.Value;
 157                                 }
 158                                 return new Pair (akeys, avals);
 159                         }
 160                 }
 161
 162                 protected virtual void TrackViewState ()
 163                 {
 164                         trackViewState = true;
 165                 }
 166
 167                 protected virtual bool IsTrackingViewState {
 168                         get { return trackViewState; }
 169                 }
 170
 171                 void IStateManager.LoadViewState (object savedState)
 172                 {
 173                         LoadViewState (savedState);
 174                 }
 175
 176                 object IStateManager.SaveViewState ()
 177                 {
 178                         return SaveViewState ();
 179                 }
 180
 181                 void IStateManager.TrackViewState ()
 182                 {
 183                         TrackViewState ();
 184                 }
 185
 186                 bool IStateManager.IsTrackingViewState {
 187                         get { return IsTrackingViewState; }
 188                 }
 189         }
 190 }
 191