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         {
  34                 Hashtable _Objects;
  35
  36                 sealed class StaticItem {
  37                         object this_lock = new object();
  38
  39                         Type type;
  40                         object instance;
  41
  42                         public StaticItem (Type type)
  43                         {
  44                                 this.type = type;
  45                         }
  46
  47                         public StaticItem (StaticItem item)
  48                         {
  49                                 this.type = item.type;
  50                         }
  51
  52                         public object Instance {
  53                                 get {
  54                                         lock (this_lock) {
  55                                                 if (instance == null)
  56                                                         instance = Activator.CreateInstance (type);
  57                                         }
  58
  59                                         return instance;
  60                                 }
  61                         }
  62                 }
  63
  64                 // Needs to hold object items that can be latebound and can be serialized
  65 #if ONLY_1_1
  66                 [SecurityPermission (SecurityAction.Demand, UnmanagedCode = true)]
  67 #endif
  68                 public HttpStaticObjectsCollection ()
  69                 {
  70                         _Objects = new Hashtable ();
  71                 }
  72
  73                 // this ctor has no security requirements and is used when creating HttpApplicationState
  74                 internal HttpStaticObjectsCollection (HttpApplicationState appstate)
  75                 {
  76                         _Objects = new Hashtable ();
  77                 }
  78
  79                 public object GetObject (string name)
  80                 {
  81                         return this [name];
  82                 }
  83
  84                 public IEnumerator GetEnumerator ()
  85                 {
  86                         return _Objects.GetEnumerator ();
  87                 }
  88
  89                 public void CopyTo (Array array, int index)
  90                 {
  91                         _Objects.CopyTo (array, index);
  92                 }
  93
  94                 internal IDictionary GetObjects ()
  95                 {
  96                         return _Objects;
  97                 }
  98
  99                 public object this [string name] {
 100                         get {
 101                                 StaticItem item = _Objects [name] as StaticItem;
 102                                 if (item == null)
 103                                         return null;
 104
 105                                 return item.Instance;
 106                         }
 107                 }
 108
 109                 public int Count {
 110                         get { return _Objects.Count; }
 111                 }
 112
 113                 public bool IsReadOnly {
 114                         get { return true; }
 115                 }
 116
 117                 public bool IsSynchronized {
 118                         get { return false; }
 119                 }
 120
 121                 [MonoTODO ("Not implemented")]
 122                 public bool NeverAccessed {
 123                         get { throw new NotImplementedException (); }
 124                 }
 125
 126                 public object SyncRoot {
 127                         get { return this; }
 128                 }
 129
 130                 internal HttpStaticObjectsCollection Clone ()
 131                 {
 132                         HttpStaticObjectsCollection coll = new HttpStaticObjectsCollection ();
 133                         coll._Objects = new Hashtable ();
 134                         foreach (string key in _Objects.Keys) {
 135                                 StaticItem item = new StaticItem ((StaticItem) _Objects [key]);
 136                                 coll._Objects [key] = item;
 137                         }
 138
 139                         return coll;
 140                 }
 141
 142                 internal void Add (ObjectTagBuilder tag)
 143                 {
 144                         _Objects.Add (tag.ObjectID, new StaticItem (tag.Type));
 145                 }
 146
 147                 void Set (string name, object obj)
 148                 {
 149                         _Objects [name] = obj;
 150                 }
 151
 152                 public void Serialize (BinaryWriter writer)
 153                 {
 154                         writer.Write (_Objects.Count);
 155                         foreach (string key in _Objects.Keys) {
 156                                 writer.Write (key);
 157                                 System.Web.Util.AltSerialization.Serialize (writer, _Objects [key]);
 158                         }
 159                 }
 160
 161                 public static HttpStaticObjectsCollection Deserialize (BinaryReader reader)
 162                 {
 163                         HttpStaticObjectsCollection result = new HttpStaticObjectsCollection ();
 164                         for (int i = reader.ReadInt32 (); i > 0; i--)
 165                                 result.Set (reader.ReadString (),
 166                                         System.Web.Util.AltSerialization.Deserialize (reader));
 167
 168                         return result;
 169                 }
 170
 171                 internal byte [] ToByteArray ()
 172                 {
 173                         MemoryStream stream = null;
 174                         try {
 175                                 stream = new MemoryStream ();
 176                                 Serialize (new BinaryWriter (stream));
 177                                 return stream.GetBuffer ();
 178                         } catch {
 179                                 throw;
 180                         } finally {
 181                                 if (stream != null)
 182                                         stream.Close ();
 183                         }
 184                 }
 185
 186                 internal static HttpStaticObjectsCollection FromByteArray (byte [] data)
 187                 {
 188                         HttpStaticObjectsCollection objs = null;
 189                         MemoryStream stream = null;
 190                         try {
 191                                 stream = new MemoryStream (data);
 192                                 objs = Deserialize (new BinaryReader (stream));
 193                         } catch {
 194                                 throw;
 195                         } finally {
 196                                 if (stream != null)
 197                                         stream.Close ();
 198                         }
 199                         return objs;
 200                 }
 201         }
 202 }
 203