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.Collections.Generic;
  25 using System.IO;
  26 using System.Security.Permissions;
  27 using System.Web.UI;
  28
  29 namespace System.Web
  30 {
  31         // CAS - no InheritanceDemand here as the class is sealed
  32         [AspNetHostingPermission (SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
  33         public sealed class HttpStaticObjectsCollection : ICollection, IEnumerable
  34         {
  35                 sealed 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                 Dictionary <string, object> objects;
  64
  65                 Dictionary <string, object> Objects {
  66                         get {
  67                                 if (objects == null)
  68                                         objects = new Dictionary <string, object> (StringComparer.Ordinal);
  69
  70                                 return objects;
  71                         }
  72                 }
  73
  74                 // Needs to hold object items that can be latebound and can be serialized
  75                 public HttpStaticObjectsCollection ()
  76                 {
  77                 }
  78
  79                 // this ctor has no security requirements and is used when creating HttpApplicationState
  80                 internal HttpStaticObjectsCollection (HttpApplicationState appstate)
  81                 {
  82                 }
  83
  84                 public object GetObject (string name)
  85                 {
  86                         return this [name];
  87                 }
  88
  89                 public IEnumerator GetEnumerator ()
  90                 {
  91                         return Objects.GetEnumerator ();
  92                 }
  93
  94                 public void CopyTo (Array array, int index)
  95                 {
  96                         if (objects == null)
  97                                 return;
  98
  99                         // Copied from Hashtable.CopyTo for the most part
 100                         if (array == null)
 101                                 throw new ArgumentNullException ("array");
 102
 103                         if (index < 0)
 104                                 throw new ArgumentOutOfRangeException ("index");
 105
 106                         if (array.Rank > 1)
 107                                 throw new ArgumentException ("array is multidimensional");
 108
 109                         if ((array.Length > 0) && (index >= array.Length))
 110                                 throw new ArgumentException ("index is equal to or greater than array.Length");
 111
 112                         if (index + objects.Count > array.Length)
 113                                 throw new ArgumentException ("Not enough room from index to end of array for this collection");
 114
 115                         // We need to emulate Hashtable here, which uses DictionaryEntry for its items
 116                         foreach (var de in objects)
 117                                 array.SetValue (new DictionaryEntry (de.Key, de.Value), index++);
 118                 }
 119
 120                 internal IDictionary GetObjects ()
 121                 {
 122                         return Objects;
 123                 }
 124
 125                 public object this [string name] {
 126                         get {
 127                                 if (objects == null)
 128                                         return null;
 129
 130                                 StaticItem item = null;
 131                                 object o;
 132                                 if (Objects.TryGetValue (name, out o))
 133                                         item = o as StaticItem;
 134
 135                                 if (item == null)
 136                                         return null;
 137
 138                                 return item.Instance;
 139                         }
 140                 }
 141
 142                 public int Count {
 143                         get {
 144                                 if (objects == null)
 145                                         return 0;
 146
 147                                 return Objects.Count;
 148                         }
 149                 }
 150
 151                 public bool IsReadOnly {
 152                         get { return true; }
 153                 }
 154
 155                 public bool IsSynchronized {
 156                         get { return false; }
 157                 }
 158
 159                 [MonoTODO ("Not implemented")]
 160                 public bool NeverAccessed {
 161                         get { throw new NotImplementedException (); }
 162                 }
 163
 164                 public object SyncRoot {
 165                         get { return this; }
 166                 }
 167
 168                 internal HttpStaticObjectsCollection Clone ()
 169                 {
 170                         HttpStaticObjectsCollection coll = new HttpStaticObjectsCollection ();
 171                         if (objects == null)
 172                                 return coll;
 173
 174                         var collObjects = coll.Objects;
 175                         foreach (var de in objects) {
 176                                 StaticItem item = new StaticItem ((StaticItem) de.Value);
 177                                 collObjects [de.Key] = item;
 178                         }
 179
 180                         return coll;
 181                 }
 182
 183                 internal void Add (ObjectTagBuilder tag)
 184                 {
 185                         Objects.Add (tag.ObjectID, new StaticItem (tag.Type));
 186                 }
 187
 188                 void Set (string name, object obj)
 189                 {
 190                         Objects [name] = obj;
 191                 }
 192
 193                 public void Serialize (BinaryWriter writer)
 194                 {
 195                         if (objects == null) {
 196                                 writer.Write (0);
 197                                 return;
 198                         }
 199
 200                         writer.Write (objects.Count);
 201                         foreach (var de in objects) {
 202                                 writer.Write (de.Key);
 203                                 System.Web.Util.AltSerialization.Serialize (writer, de.Value);
 204                         }
 205                 }
 206
 207                 public static HttpStaticObjectsCollection Deserialize (BinaryReader reader)
 208                 {
 209                         HttpStaticObjectsCollection result = new HttpStaticObjectsCollection ();
 210                         for (int i = reader.ReadInt32 (); i > 0; i--)
 211                                 result.Set (reader.ReadString (), System.Web.Util.AltSerialization.Deserialize (reader));
 212
 213                         return result;
 214                 }
 215
 216                 internal byte [] ToByteArray ()
 217                 {
 218                         MemoryStream stream = null;
 219                         try {
 220                                 stream = new MemoryStream ();
 221                                 Serialize (new BinaryWriter (stream));
 222                                 return stream.GetBuffer ();
 223                         } catch {
 224                                 throw;
 225                         } finally {
 226                                 if (stream != null)
 227                                         stream.Close ();
 228                         }
 229                 }
 230
 231                 internal static HttpStaticObjectsCollection FromByteArray (byte [] data)
 232                 {
 233                         HttpStaticObjectsCollection objs = null;
 234                         MemoryStream stream = null;
 235                         try {
 236                                 stream = new MemoryStream (data);
 237                                 objs = Deserialize (new BinaryReader (stream));
 238                         } catch {
 239                                 throw;
 240                         } finally {
 241                                 if (stream != null)
 242                                         stream.Close ();
 243                         }
 244                         return objs;
 245                 }
 246         }
 247 }
 248