HttpStaticObjectsCollection.cs :  » 2.6.4-mono-.net-core » System.Web » System » Web » C# / CSharp Open Source

//
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// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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//

using System.Collections;
using System.IO;
using System.Security.Permissions;
using System.Web.UI;

namespace System.Web{
  // CAS - no InheritanceDemand here as the class is sealed
  [AspNetHostingPermission (SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
  public sealed class HttpStaticObjectsCollection : ICollection, IEnumerable
  {
    Hashtable _Objects;

    sealed class StaticItem {
      object this_lock = new object();
      
      Type type;
      object instance;
      
      public StaticItem (Type type)
      {
        this.type = type;
      }

      public StaticItem (StaticItem item)
      {
        this.type = item.type;
      }
      
      public object Instance {
        get {
          lock (this_lock) {
            if (instance == null)
              instance = Activator.CreateInstance (type);
          }

          return instance;
        }
      }
    }

    // Needs to hold object items that can be latebound and can be serialized
#if ONLY_1_1
    [SecurityPermission (SecurityAction.Demand, UnmanagedCode = true)]
#endif
    public HttpStaticObjectsCollection ()
    {
      _Objects = new Hashtable ();
    }

    // this ctor has no security requirements and is used when creating HttpApplicationState
    internal HttpStaticObjectsCollection (HttpApplicationState appstate)
    {
      _Objects = new Hashtable ();
    }

    public object GetObject (string name)
    {
      return this [name];
    }

    public IEnumerator GetEnumerator ()
    {
      return _Objects.GetEnumerator ();
    }

    public void CopyTo (Array array, int index)
    {
      _Objects.CopyTo (array, index);
    }   

    internal IDictionary GetObjects ()
    {
      return _Objects;
    }

    public object this [string name] {
      get {
        StaticItem item = _Objects [name] as StaticItem;
        if (item == null)
          return null;
        
        return item.Instance;
      }
    }

    public int Count {
      get { return _Objects.Count; }
    }

    public bool IsReadOnly {
      get { return true; }
    }

    public bool IsSynchronized {
      get { return false; }
    }

    [MonoTODO ("Not implemented")]
    public bool NeverAccessed {
      get { throw new NotImplementedException (); }
    }

    public object SyncRoot {
      get { return this; }
    }

    internal HttpStaticObjectsCollection Clone ()
    {
      HttpStaticObjectsCollection coll = new HttpStaticObjectsCollection ();
      coll._Objects = new Hashtable ();
      foreach (string key in _Objects.Keys) {
        StaticItem item = new StaticItem ((StaticItem) _Objects [key]);
        coll._Objects [key] = item;
      }
      
      return coll;
    }

    internal void Add (ObjectTagBuilder tag)
    {
      _Objects.Add (tag.ObjectID, new StaticItem (tag.Type));
    }
    
    void Set (string name, object obj)
    {
      _Objects [name] = obj;
    }

    public void Serialize (BinaryWriter writer)
    {
      writer.Write (_Objects.Count);
      foreach (string key in _Objects.Keys) {
        writer.Write (key);
        System.Web.Util.AltSerialization.Serialize (writer, _Objects [key]);
      }
    }

    public static HttpStaticObjectsCollection Deserialize (BinaryReader reader)
    {
      HttpStaticObjectsCollection result = new HttpStaticObjectsCollection ();
      for (int i = reader.ReadInt32 (); i > 0; i--)
        result.Set (reader.ReadString (),
          System.Web.Util.AltSerialization.Deserialize (reader));

      return result;
    }

    internal byte [] ToByteArray ()
    {
      MemoryStream stream = null;
      try {
        stream = new MemoryStream ();
        Serialize (new BinaryWriter (stream));
        return stream.GetBuffer ();
      } catch {
        throw;
      } finally {
        if (stream != null)
          stream.Close ();
      }
    }

    internal static HttpStaticObjectsCollection FromByteArray (byte [] data)
    {
      HttpStaticObjectsCollection objs = null;
      MemoryStream stream = null;
      try {
        stream = new MemoryStream (data);
        objs = Deserialize (new BinaryReader (stream));
      } catch {
        throw;
      } finally {
        if (stream != null)
          stream.Close ();
      }
      return objs;
    }
  }
}