httpstaticobjectscollection.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / httpstaticobjectscollection.cs / 1 / httpstaticobjectscollection.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

/* 
 * Static objects collection for application and session state 
 * with deferred creation
 */ 
namespace System.Web {
    using System.Runtime.InteropServices;

    using System.Collections; 
    using System.Collections.Specialized;
    using System.IO; 
    using System.Web; 
    using System.Web.Util;
    using System.Security.Permissions; 

    //
    // Static objects collection class
    // 

    ///  
    ///    Provides a static objects collection for the 
    ///       HTTPApplicationState.StaticObjects and TemplateParser.SessionObjects properties.
    ///  
    [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)]
    public sealed class HttpStaticObjectsCollection : ICollection {
        private IDictionary _objects = new Hashtable(StringComparer.OrdinalIgnoreCase);
 

        ///  
        ///     
        ///       Initializes a new instance of the 
        ///       class. 
        ///     
        /// 
        public HttpStaticObjectsCollection() {
        } 

        internal void Add(String name, Type t, bool lateBound) { 
            _objects.Add(name, new HttpStaticObjectsEntry(name, t, lateBound)); 
        }
 
        // Expose the internal dictionary (for codegen purposes)
        internal IDictionary Objects {
            get { return _objects;}
        } 

        /* 
         * Create a copy without copying instances (names and types only) 
         */
        internal HttpStaticObjectsCollection Clone() { 
            HttpStaticObjectsCollection c = new HttpStaticObjectsCollection();

            IDictionaryEnumerator e = _objects.GetEnumerator();
 
            while (e.MoveNext()) {
                HttpStaticObjectsEntry entry = (HttpStaticObjectsEntry)e.Value; 
                c.Add(entry.Name, entry.ObjectType, entry.LateBound); 
            }
 
            return c;
        }

        /* 
         * Get number of real instances created
         */ 
        internal int GetInstanceCount() { 
            int count = 0;
 
            IDictionaryEnumerator e = _objects.GetEnumerator();

            while (e.MoveNext()) {
                HttpStaticObjectsEntry entry = (HttpStaticObjectsEntry)e.Value; 

                if (entry.HasInstance) 
                    count++; 
            }
 
            return count;
        }

 
        /// 
        ///  
        public bool NeverAccessed { 
            get {return (GetInstanceCount() == 0);}
        } 

        //
        // Implementation of standard collection stuff
        // 

 
        ///  
        ///    Gets the object in the collection with the given name (case
        ///       insensitive).  
        /// 
        public Object this[String name]
        {
            get { 
                HttpStaticObjectsEntry e = (HttpStaticObjectsEntry)_objects[name];
                return(e != null) ? e.Instance : null; 
            } 
        }
 
        // Alternative to the default property

        /// 
        ///    Gets the object in the collection with the given name 
        ///       (case insensitive). Alternative to the  accessor.
        ///  
        public Object GetObject(String name) { 
            return this[name];
        } 


        /// 
        ///    Gets the number of objects in the collection. 
        /// 
        public int Count { 
            get { 
                return _objects.Count;
            } 
        }


        ///  
        ///    Returns a dictionary enumerator used for iterating through the key/value
        ///       pairs contained in the collection. 
        ///  
        public IEnumerator GetEnumerator() {
            return new HttpStaticObjectsEnumerator((IDictionaryEnumerator)_objects.GetEnumerator()); 
        }


        ///  
        ///    Copies members of the collection into an array.
        ///  
        public void CopyTo(Array array, int index) { 
            for (IEnumerator e = this.GetEnumerator(); e.MoveNext();)
                array.SetValue(e.Current, index++); 
        }


        ///  
        ///    Gets an object that can be used to synchronize access to the collection.
        ///  
        public Object SyncRoot { 
            get { return this;}
        } 


        /// 
        ///    Gets a value indicating whether the collection is read-only. 
        /// 
        public bool IsReadOnly { 
            get { return true;} 
        }
 

        /// 
        ///    Gets a value indicating whether the collection is synchronized.
        ///  
        public bool IsSynchronized {
            get { return false;} 
        } 

 
        public void Serialize(BinaryWriter writer) {
            IDictionaryEnumerator   e;
            HttpStaticObjectsEntry  entry;
            bool                    hasInstance; 

            writer.Write(Count); 
 
            e = _objects.GetEnumerator();
            while (e.MoveNext()) { 
                entry = (HttpStaticObjectsEntry)e.Value;
                writer.Write(entry.Name);
                hasInstance = entry.HasInstance;
                writer.Write(hasInstance); 

                if (hasInstance) { 
                    AltSerialization.WriteValueToStream(entry.Instance, writer); 
                }
                else { 
                    writer.Write(entry.ObjectType.FullName);
                    writer.Write(entry.LateBound);
                }
            } 
        }
 
 
        static public HttpStaticObjectsCollection Deserialize(BinaryReader reader) {
            int     count; 
            string  name;
            string  typename;
            bool    hasInstance;
            Object  instance; 
            HttpStaticObjectsEntry  entry;
            HttpStaticObjectsCollection col; 
 
            col = new HttpStaticObjectsCollection();
 
            count = reader.ReadInt32();
            while (count-- > 0) {
                name = reader.ReadString();
                hasInstance = reader.ReadBoolean(); 
                if (hasInstance) {
                    instance = AltSerialization.ReadValueFromStream(reader); 
                    entry = new HttpStaticObjectsEntry(name, instance, 0); 
                }
                else { 
                    typename = reader.ReadString();
                    bool lateBound = reader.ReadBoolean();
                    entry = new HttpStaticObjectsEntry(name, Type.GetType(typename), lateBound);
                } 

                col._objects.Add(name, entry); 
            } 

            return col; 
        }
    }

// 
// Dictionary entry class
// 
 
    internal class HttpStaticObjectsEntry {
        private String _name; 
        private Type   _type;
        private bool   _lateBound;
        private Object _instance;
 
        internal HttpStaticObjectsEntry(String name, Type t, bool lateBound) {
            _name = name; 
            _type = t; 
            _lateBound = lateBound;
            _instance = null; 
        }

        internal HttpStaticObjectsEntry(String name, Object instance, int dummy) {
            _name = name; 
            _type = instance.GetType();
            _instance = instance; 
        } 

        internal String Name { 
            get { return _name;}
        }

        internal Type ObjectType { 
            get { return _type;}
        } 
 
        internal bool LateBound {
            get { return _lateBound;} 
        }

        internal Type DeclaredType {
            get { return _lateBound ? typeof(object) : ObjectType; } 
        }
 
        internal bool HasInstance { 
            get { return(_instance != null);}
        } 

        internal Object Instance {
            get {
                if (_instance == null) { 
                    lock (this) {
                        if (_instance == null) 
                            _instance = Activator.CreateInstance(_type); 
                    }
                } 

                return _instance;
            }
        } 
    }
 
    // 
    // Enumerator class for static objects collection
    // 
    internal class HttpStaticObjectsEnumerator : IDictionaryEnumerator {
        private IDictionaryEnumerator _enum;

        internal HttpStaticObjectsEnumerator(IDictionaryEnumerator e) { 
            _enum = e;
        } 
 
        // Dictionary enumarator implementation
 
        public void Reset() {
            _enum.Reset();
        }
 
        public bool MoveNext() {
            return _enum.MoveNext(); 
        } 

        public Object Key { 
            get {
                return _enum.Key;
            }
        } 

        public Object Value { 
            get { 
                HttpStaticObjectsEntry e = (HttpStaticObjectsEntry)_enum.Value;
 
                if (e == null)
                    return null;

                return e.Instance; 
            }
        } 
 
        public Object Current {
            get { 
                return Entry;
            }
        }
 
        public DictionaryEntry Entry {
            get { 
                return new DictionaryEntry(_enum.Key, this.Value); 
            }
        } 
    }

}

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