//
// System.Web.UI.PageStatePersister
//
// Author:
//	Dick Porter  <dick@ximian.com>
//
// Copyright (C) 2005-2010 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// 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
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

namespace System.Web.UI
{
	public abstract class PageStatePersister
	{
		object control_state;
		object view_state;
		Page page;
		IStateFormatter state_formatter;
		
		protected PageStatePersister (Page page)
		{
			if (page == null)
				throw new ArgumentNullException ("page");
			this.page = page;
		}

		public object ControlState  {
			get { return control_state; }
			set { control_state = value; }
		}

		public object ViewState  {
			get { return view_state; }
			set { view_state = value; }
		}

		protected Page Page {
			get { return page; }
			set { page = value; }
		}

		protected IStateFormatter StateFormatter 
		{
			get {
				if (state_formatter == null)
					state_formatter = page.GetFormatter ();
				return state_formatter;
			}
		}

		public abstract void Load ();

		public abstract void Save ();
	}
}
