class/System.Configuration/System.Configuration.Provider/ProviderCollection.cs

   1 //
   2 // System.Configuration.Provider.ProviderCollection
   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
  34 namespace System.Configuration.Provider {
  35         public class ProviderCollection : ICollection
  36         {
  37                 public ProviderCollection ()
  38                 {
  39                         lookup = new Hashtable (10, StringComparer.InvariantCultureIgnoreCase);
  40                         values = new ArrayList ();
  41                 }
  42
  43                 public virtual void Add (ProviderBase provider)
  44                 {
  45                         if (readOnly)
  46                                 throw new NotSupportedException ();
  47
  48                         if (provider == null || provider.Name == null)
  49                                 throw new ArgumentNullException ();
  50
  51                         int pos = values.Add (provider);
  52                         try {
  53                                 lookup.Add (provider.Name, pos);
  54                         } catch {
  55                                 values.RemoveAt (pos);
  56                                 throw;
  57                         }
  58                 }
  59
  60                 public void Clear ()
  61                 {
  62                         if (readOnly)
  63                                 throw new NotSupportedException ();
  64                         values.Clear ();
  65                         lookup.Clear ();
  66                 }
  67
  68                 public void CopyTo (ProviderBase[] array, int index)
  69                 {
  70                         values.CopyTo (array, index);
  71                 }
  72
  73                 void ICollection.CopyTo (Array array, int index)
  74                 {
  75                         values.CopyTo (array, index);
  76                 }
  77
  78                 public IEnumerator GetEnumerator ()
  79                 {
  80                         return values.GetEnumerator();
  81                 }
  82
  83                 public void Remove (string name)
  84                 {
  85                         if (readOnly)
  86                                 throw new NotSupportedException ();
  87
  88                         object position = lookup [name];
  89
  90                         if (position == null || !(position is int))
  91                                 throw new ArgumentException ();
  92
  93                         int pos = (int) position;
  94                         if (pos >= values.Count)
  95                                 throw new ArgumentException ();
  96
  97                         values.RemoveAt (pos);
  98                         lookup.Remove (name);
  99
 100                         ArrayList changed = new ArrayList ();
 101                         foreach (DictionaryEntry de in lookup) {
 102                                         if ((int) de.Value <= pos)
 103                                                 continue;
 104                                         changed.Add (de.Key);
 105                         }
 106
 107                         foreach (string key in changed)
 108                                 lookup [key] = (int)lookup [key] - 1;
 109                 }
 110
 111                 public void SetReadOnly ()
 112                 {
 113                         readOnly = true;
 114                 }
 115
 116                 public int Count { get { return values.Count; } }
 117                 public bool IsSynchronized { get { return false; } }
 118                 public object SyncRoot { get { return this; } }
 119
 120                 public ProviderBase this [string name] {
 121                         get {
 122                                 object pos = lookup [name];
 123                                 if (pos == null) return null;
 124
 125                                 return values [(int) pos] as ProviderBase;
 126                         }
 127                 }
 128
 129
 130                 Hashtable lookup;
 131                 bool readOnly;
 132                 ArrayList values;
 133
 134         }
 135 }
 136 #endif