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 using System;
  23 using System.Collections;
  24 using System.IO;
  25 using System.Web.UI;
  26
  27 namespace System.Web {
  28         public sealed class HttpStaticObjectsCollection : ICollection, IEnumerable {
  29                 private Hashtable _Objects;
  30
  31                 class StaticItem {
  32                         Type type;
  33                         object instance;
  34
  35                         public StaticItem (Type type)
  36                         {
  37                                 this.type = type;
  38                         }
  39
  40                         public StaticItem (StaticItem item)
  41                         {
  42                                 this.type = item.type;
  43                         }
  44
  45                         public object Instance {
  46                                 get {
  47                                         lock (this) {
  48                                                 if (instance == null)
  49                                                         instance = Activator.CreateInstance (type);
  50                                         }
  51
  52                                         return instance;
  53                                 }
  54                         }
  55                 }
  56
  57                 // Needs to hold object items that can be latebound and can be serialized
  58                 public HttpStaticObjectsCollection ()
  59                 {
  60                         _Objects = new Hashtable();
  61                 }
  62
  63                 public object GetObject (string name)
  64                 {
  65                         return this [name];
  66                 }
  67
  68                 public IEnumerator GetEnumerator ()
  69                 {
  70                         return _Objects.GetEnumerator ();
  71                 }
  72
  73                 public void CopyTo (Array array, int index)
  74                 {
  75                         _Objects.CopyTo (array, index);
  76                 }
  77
  78                 internal IDictionary GetObjects ()
  79                 {
  80                         return _Objects;
  81                 }
  82
  83                 public object this [string name] {
  84                         get {
  85                                 StaticItem item = _Objects [name] as StaticItem;
  86                                 if (item == null)
  87                                         return null;
  88
  89                                 return item.Instance;
  90                         }
  91                 }
  92
  93                 public int Count {
  94                         get { return _Objects.Count; }
  95                 }
  96
  97                 public bool IsReadOnly {
  98                         get { return true; }
  99                 }
 100
 101                 public bool IsSynchronized {
 102                         get { return false; }
 103                 }
 104
 105                 public object SyncRoot {
 106                         get { return this; }
 107                 }
 108
 109                 internal HttpStaticObjectsCollection Clone ()
 110                 {
 111                         HttpStaticObjectsCollection coll = new HttpStaticObjectsCollection ();
 112                         coll._Objects = new Hashtable ();
 113                         foreach (string key in _Objects.Keys) {
 114                                 StaticItem item = new StaticItem ((StaticItem) _Objects [key]);
 115                                 coll._Objects [key] = item;
 116                         }
 117
 118                         return coll;
 119                 }
 120
 121                 internal void Add (ObjectTagBuilder tag)
 122                 {
 123                         _Objects.Add (tag.ObjectID, new StaticItem (tag.Type));
 124                 }
 125
 126                 private void Set (string name, object obj)
 127                 {
 128                         _Objects [name] = obj;
 129                 }
 130
 131                 internal void Serialize (BinaryWriter w)
 132                 {
 133                         lock (_Objects) {
 134                                 w.Write (Count);
 135                                 foreach (string key in _Objects.Keys) {
 136                                         w.Write (key);
 137                                         object value = _Objects [key];
 138                                         if (value == null) {
 139                                                 w.Write (System.Web.Util.AltSerialization.NullIndex);
 140                                                 continue;
 141                                         }
 142
 143                                         System.Web.Util.AltSerialization.SerializeByType (w, value);
 144                                 }
 145                         }
 146                 }
 147
 148                 internal static HttpStaticObjectsCollection Deserialize (BinaryReader r)
 149                 {
 150                         HttpStaticObjectsCollection result = new HttpStaticObjectsCollection ();
 151                         for (int i = r.ReadInt32 (); i > 0; i--) {
 152                                 string key = r.ReadString ();
 153                                 int index = r.ReadInt32 ();
 154                                 if (index == System.Web.Util.AltSerialization.NullIndex)
 155                                         result.Set (key, null);
 156                                 else
 157                                         result.Set (key, System.Web.Util.AltSerialization.DeserializeFromIndex (index, r));
 158                         }
 159
 160                         return result;
 161                 }
 162
 163                 internal byte [] ToByteArray ()
 164                 {
 165                         MemoryStream stream = null;
 166                         try {
 167                                 stream = new MemoryStream ();
 168                                 Serialize (new BinaryWriter (stream));
 169                                 return stream.GetBuffer ();
 170                         } catch {
 171                                 throw;
 172                         } finally {
 173                                 if (stream != null)
 174                                         stream.Close ();
 175                         }
 176                 }
 177
 178                 internal static HttpStaticObjectsCollection FromByteArray (byte [] data)
 179                 {
 180                         HttpStaticObjectsCollection objs = null;
 181                         MemoryStream stream = null;
 182                         try {
 183                                 stream = new MemoryStream (data);
 184                                 objs = Deserialize (new BinaryReader (stream));
 185                         } catch {
 186                                 throw;
 187                         } finally {
 188                                 if (stream != null)
 189                                         stream.Close ();
 190                         }
 191                         return objs;
 192                 }
 193         }
 194 }
 195