mcs/class/System.Web/System.Web/HttpStaticObjectsCollection.cs

   1
   2 //
   3 // Permission is hereby granted, free of charge, to any person obtaining
   4 // a copy of this software and associated documentation files (the
   5 // "Software"), to deal in the Software without restriction, including
   6 // without limitation the rights to use, copy, modify, merge, publish,
   7 // distribute, sublicense, and/or sell copies of the Software, and to
   8 // permit persons to whom the Software is furnished to do so, subject to
   9 // the following conditions:
  10 //
  11 // The above copyright notice and this permission notice shall be
  12 // included in all copies or substantial portions of the Software.
  13 //
  14 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  15 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  16 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  17 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  18 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  19 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  20 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  21 //
  22
  23 using System.Collections;
  24 using System.IO;
  25 using System.Security.Permissions;
  26 using System.Web.UI;
  27
  28 namespace System.Web {
  29
  30         // CAS - no InheritanceDemand here as the class is sealed
  31         [AspNetHostingPermission (SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
  32         public sealed class HttpStaticObjectsCollection : ICollection, IEnumerable {
  33                 Hashtable _Objects;
  34
  35                 class StaticItem {
  36                         object this_lock = new object();
  37
  38                         Type type;
  39                         object instance;
  40
  41                         public StaticItem (Type type)
  42                         {
  43                                 this.type = type;
  44                         }
  45
  46                         public StaticItem (StaticItem item)
  47                         {
  48                                 this.type = item.type;
  49                         }
  50
  51                         public object Instance {
  52                                 get {
  53                                         lock (this_lock) {
  54                                                 if (instance == null)
  55                                                         instance = Activator.CreateInstance (type);
  56                                         }
  57
  58                                         return instance;
  59                                 }
  60                         }
  61                 }
  62
  63                 // Needs to hold object items that can be latebound and can be serialized
  64 #if ONLY_1_1
  65                 [SecurityPermission (SecurityAction.Demand, UnmanagedCode = true)]
  66 #endif
  67                 public HttpStaticObjectsCollection ()
  68                 {
  69                         _Objects = new Hashtable ();
  70                 }
  71
  72                 // this ctor has no security requirements and is used when creating HttpApplicationState
  73                 internal HttpStaticObjectsCollection (HttpApplicationState appstate)
  74                 {
  75                         _Objects = new Hashtable ();
  76                 }
  77
  78                 public object GetObject (string name)
  79                 {
  80                         return this [name];
  81                 }
  82
  83                 public IEnumerator GetEnumerator ()
  84                 {
  85                         return _Objects.GetEnumerator ();
  86                 }
  87
  88                 public void CopyTo (Array array, int index)
  89                 {
  90                         _Objects.CopyTo (array, index);
  91                 }
  92
  93                 internal IDictionary GetObjects ()
  94                 {
  95                         return _Objects;
  96                 }
  97
  98                 public object this [string name] {
  99                         get {
 100                                 StaticItem item = _Objects [name] as StaticItem;
 101                                 if (item == null)
 102                                         return null;
 103
 104                                 return item.Instance;
 105                         }
 106                 }
 107
 108                 public int Count {
 109                         get { return _Objects.Count; }
 110                 }
 111
 112                 public bool IsReadOnly {
 113                         get { return true; }
 114                 }
 115
 116                 public bool IsSynchronized {
 117                         get { return false; }
 118                 }
 119
 120 #if NET_2_0
 121                 [MonoTODO ("Not implemented")]
 122                 public bool NeverAccessed {
 123                         get { throw new NotImplementedException (); }
 124                 }
 125 #endif
 126
 127                 public object SyncRoot {
 128                         get { return this; }
 129                 }
 130
 131                 internal HttpStaticObjectsCollection Clone ()
 132                 {
 133                         HttpStaticObjectsCollection coll = new HttpStaticObjectsCollection ();
 134                         coll._Objects = new Hashtable ();
 135                         foreach (string key in _Objects.Keys) {
 136                                 StaticItem item = new StaticItem ((StaticItem) _Objects [key]);
 137                                 coll._Objects [key] = item;
 138                         }
 139
 140                         return coll;
 141                 }
 142
 143                 internal void Add (ObjectTagBuilder tag)
 144                 {
 145                         _Objects.Add (tag.ObjectID, new StaticItem (tag.Type));
 146                 }
 147
 148                 void Set (string name, object obj)
 149                 {
 150                         _Objects [name] = obj;
 151                 }
 152
 153 #if NET_2_0
 154                 public void Serialize (BinaryWriter writer)
 155 #else
 156                 internal void Serialize (BinaryWriter writer)
 157 #endif
 158                 {
 159                         writer.Write (_Objects.Count);
 160                         foreach (string key in _Objects.Keys) {
 161                                 writer.Write (key);
 162                                 System.Web.Util.AltSerialization.Serialize (writer, _Objects [key]);
 163                         }
 164                 }
 165
 166 #if NET_2_0
 167                 public static HttpStaticObjectsCollection Deserialize (BinaryReader reader)
 168 #else
 169                 internal static HttpStaticObjectsCollection Deserialize (BinaryReader reader)
 170 #endif
 171                 {
 172                         HttpStaticObjectsCollection result = new HttpStaticObjectsCollection ();
 173                         for (int i = reader.ReadInt32 (); i > 0; i--)
 174                                 result.Set (reader.ReadString (),
 175                                         System.Web.Util.AltSerialization.Deserialize (reader));
 176
 177                         return result;
 178                 }
 179
 180                 internal byte [] ToByteArray ()
 181                 {
 182                         MemoryStream stream = null;
 183                         try {
 184                                 stream = new MemoryStream ();
 185                                 Serialize (new BinaryWriter (stream));
 186                                 return stream.GetBuffer ();
 187                         } catch {
 188                                 throw;
 189                         } finally {
 190                                 if (stream != null)
 191                                         stream.Close ();
 192                         }
 193                 }
 194
 195                 internal static HttpStaticObjectsCollection FromByteArray (byte [] data)
 196                 {
 197                         HttpStaticObjectsCollection objs = null;
 198                         MemoryStream stream = null;
 199                         try {
 200                                 stream = new MemoryStream (data);
 201                                 objs = Deserialize (new BinaryReader (stream));
 202                         } catch {
 203                                 throw;
 204                         } finally {
 205                                 if (stream != null)
 206                                         stream.Close ();
 207                         }
 208                         return objs;
 209                 }
 210         }
 211 }
 212