using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using System.Web.SessionState;
using System.Web;
using System.Threading;

using javax.servlet;
using javax.servlet.http;

namespace Mainsoft.Web.SessionState
{
	public sealed partial class ServletSessionStateStoreProvider
	{
		sealed class ServletSessionStateItemCollection : ISessionStateItemCollection, java.io.Externalizable
		{
			readonly ReaderWriterLock _rwLock;
			SessionStateItemCollection _items;
			HttpStaticObjectsCollection _staticObjects;
			bool _needSessionPersistence;

			public ServletSessionStateItemCollection () { _rwLock = new ReaderWriterLock (); } //for deserialization

			public ServletSessionStateItemCollection(HttpContext context) : this() {
				
				_items = new SessionStateItemCollection ();
				_staticObjects = new HttpStaticObjectsCollection ();

				ServletConfig config = ServletSessionStateStoreProvider.GetWorkerRequest (context).Servlet.getServletConfig ();
				string sessionPersistance = config.getInitParameter (J2EEConsts.Enable_Session_Persistency);
				if (sessionPersistance != null) {
					try {
						_needSessionPersistence = Boolean.Parse (sessionPersistance);
					}
					catch (Exception) {
						_needSessionPersistence = false;
						Console.WriteLine ("EnableSessionPersistency init param's value is invalid. the value is " + sessionPersistance);
					}
				}
			}

			public HttpStaticObjectsCollection StaticObjects {
				get { return _staticObjects; }
			}
			#region ISessionStateItemCollection Members

			public void Clear () {
				_items.Clear ();
			}

			public bool Dirty {
				get {
					return _items.Dirty;
				}
				set {
					_items.Dirty = value;
				}
			}

			public System.Collections.Specialized.NameObjectCollectionBase.KeysCollection Keys {
				get { return _items.Keys; }
			}

			public void Remove (string name) {
				_items.Remove (name);
			}

			public void RemoveAt (int index) {
				_items.RemoveAt (index);
			}

			public object this [int index] {
				get {
					return _items [index];
				}
				set {
					_items [index] = value;
				}
			}

			public object this [string name] {
				get {
					return _items [name];
				}
				set {
					_items [name] = value;
				}
			}

			#endregion

			#region ICollection Members

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

			public int Count {
				get { return ((ICollection) _items).Count; }
			}

			public bool IsSynchronized {
				get { return ((ICollection) _items).IsSynchronized; }
			}

			public object SyncRoot {
				get { return ((ICollection) _items).SyncRoot; }
			}

			#endregion

			#region IEnumerable Members

			public System.Collections.IEnumerator GetEnumerator () {
				return ((IEnumerable) _items).GetEnumerator ();
			}

			#endregion

			#region Externalizable Members

			public void readExternal (java.io.ObjectInput input) {
				lock (this) {
					_needSessionPersistence = input.readBoolean ();
					if (!_needSessionPersistence) //noting has been written 
						return;

					ObjectInputStream ms = new ObjectInputStream (input);
					System.IO.BinaryReader br = new System.IO.BinaryReader (ms);
					_items = SessionStateItemCollection.Deserialize (br);
					_staticObjects = HttpStaticObjectsCollection.Deserialize (br);
				}
			}

			public void writeExternal (java.io.ObjectOutput output) {
				lock (this) {
					output.writeBoolean (_needSessionPersistence);
					if (!_needSessionPersistence)
						//indicates that there is nothing to serialize for this object
						return;

					ObjectOutputStream ms = new ObjectOutputStream (output);
					System.IO.BinaryWriter bw = new System.IO.BinaryWriter (ms);
					_items.Serialize (bw);
					_staticObjects.Serialize (bw);
				}
			}

			#endregion
		}
	}
}