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                 private Hashtable _Objects;
  34
  35                 class StaticItem {
  36                         Type type;
  37                         object instance;
  38
  39                         public StaticItem (Type type)
  40                         {
  41                                 this.type = type;
  42                         }
  43
  44                         public StaticItem (StaticItem item)
  45                         {
  46                                 this.type = item.type;
  47                         }
  48
  49                         public object Instance {
  50                                 get {
  51                                         lock (this) {
  52                                                 if (instance == null)
  53                                                         instance = Activator.CreateInstance (type);
  54                                         }
  55
  56                                         return instance;
  57                                 }
  58                         }
  59                 }
  60
  61                 // Needs to hold object items that can be latebound and can be serialized
  62 #if ONLY_1_1
  63                 [SecurityPermission (SecurityAction.Demand, UnmanagedCode = true)]
  64 #endif
  65                 public HttpStaticObjectsCollection ()
  66                 {
  67                         _Objects = new Hashtable ();
  68                 }
  69
  70                 // this ctor has no security requirements and is used when creating HttpApplicationState
  71                 internal HttpStaticObjectsCollection (HttpApplicationState appstate)
  72                 {
  73                         _Objects = new Hashtable ();
  74                 }
  75
  76                 public object GetObject (string name)
  77                 {
  78                         return this [name];
  79                 }
  80
  81                 public IEnumerator GetEnumerator ()
  82                 {
  83                         return _Objects.GetEnumerator ();
  84                 }
  85
  86                 public void CopyTo (Array array, int index)
  87                 {
  88                         _Objects.CopyTo (array, index);
  89                 }
  90
  91                 internal IDictionary GetObjects ()
  92                 {
  93                         return _Objects;
  94                 }
  95
  96                 public object this [string name] {
  97                         get {
  98                                 StaticItem item = _Objects [name] as StaticItem;
  99                                 if (item == null)
 100                                         return null;
 101
 102                                 return item.Instance;
 103                         }
 104                 }
 105
 106                 public int Count {
 107                         get { return _Objects.Count; }
 108                 }
 109
 110                 public bool IsReadOnly {
 111                         get { return true; }
 112                 }
 113
 114                 public bool IsSynchronized {
 115                         get { return false; }
 116                 }
 117
 118 #if NET_2_0
 119                 [MonoTODO ("Not implemented")]
 120                 public bool NeverAccessed {
 121                         get { throw new NotImplementedException (); }
 122                 }
 123 #endif
 124
 125                 public object SyncRoot {
 126                         get { return this; }
 127                 }
 128
 129                 internal HttpStaticObjectsCollection Clone ()
 130                 {
 131                         HttpStaticObjectsCollection coll = new HttpStaticObjectsCollection ();
 132                         coll._Objects = new Hashtable ();
 133                         foreach (string key in _Objects.Keys) {
 134                                 StaticItem item = new StaticItem ((StaticItem) _Objects [key]);
 135                                 coll._Objects [key] = item;
 136                         }
 137
 138                         return coll;
 139                 }
 140
 141                 internal void Add (ObjectTagBuilder tag)
 142                 {
 143                         _Objects.Add (tag.ObjectID, new StaticItem (tag.Type));
 144                 }
 145
 146                 private void Set (string name, object obj)
 147                 {
 148                         _Objects [name] = obj;
 149                 }
 150
 151 #if NET_2_0
 152                 public void Serialize (BinaryWriter writer)
 153 #else
 154                 internal void Serialize (BinaryWriter writer)
 155 #endif
 156                 {
 157                         lock (_Objects) {
 158                                 writer.Write (Count);
 159                                 foreach (string key in _Objects.Keys) {
 160                                         writer.Write (key);
 161                                         object value = _Objects [key];
 162                                         if (value == null) {
 163                                                 writer.Write (System.Web.Util.AltSerialization.NullIndex);
 164                                                 continue;
 165                                         }
 166
 167                                         System.Web.Util.AltSerialization.SerializeByType (writer, value);
 168                                 }
 169                         }
 170                 }
 171
 172 #if NET_2_0
 173                 public static HttpStaticObjectsCollection Deserialize (BinaryReader reader)
 174 #else
 175                 internal static HttpStaticObjectsCollection Deserialize (BinaryReader reader)
 176 #endif
 177                 {
 178                         HttpStaticObjectsCollection result = new HttpStaticObjectsCollection ();
 179                         for (int i = reader.ReadInt32 (); i > 0; i--) {
 180                                 string key = reader.ReadString ();
 181                                 int index = reader.ReadInt32 ();
 182                                 if (index == System.Web.Util.AltSerialization.NullIndex)
 183                                         result.Set (key, null);
 184                                 else
 185                                         result.Set (key, System.Web.Util.AltSerialization.DeserializeFromIndex (index, reader));
 186                         }
 187
 188                         return result;
 189                 }
 190
 191                 internal byte [] ToByteArray ()
 192                 {
 193                         MemoryStream stream = null;
 194                         try {
 195                                 stream = new MemoryStream ();
 196                                 Serialize (new BinaryWriter (stream));
 197                                 return stream.GetBuffer ();
 198                         } catch {
 199                                 throw;
 200                         } finally {
 201                                 if (stream != null)
 202                                         stream.Close ();
 203                         }
 204                 }
 205
 206                 internal static HttpStaticObjectsCollection FromByteArray (byte [] data)
 207                 {
 208                         HttpStaticObjectsCollection objs = null;
 209                         MemoryStream stream = null;
 210                         try {
 211                                 stream = new MemoryStream (data);
 212                                 objs = Deserialize (new BinaryReader (stream));
 213                         } catch {
 214                                 throw;
 215                         } finally {
 216                                 if (stream != null)
 217                                         stream.Close ();
 218                         }
 219                         return objs;
 220                 }
 221         }
 222 }
 223