sitemap.cs

基于.Net环境下c#实现的国人自己的Blog平台,基于.Text的核心技术,但做了汉化以及改写了一部分的核心代码,值得研究学习

#region Disclaimer/Info

///////////////////////////////////////////////////////////////////////////////////////////////////
// .Text WebLog
// 
// .Text is an open source weblog system started by Scott Watermasysk. 
// Blog: http://ScottWater.com/blog 
// RSS: http://scottwater.com/blog/rss.aspx
// Email: [e-mail]
//
// For updated news and information please visit http://scottwater.com/dottext and subscribe to 
// the Rss feed @ http://scottwater.com/dottext/rss.aspx
//
// On its release (on or about August 1, 2003) this application is licensed under the BSD. However, I reserve the 
// right to change or modify this at any time. The most recent and up to date license can always be fount at:
// http://ScottWater.com/License.txt
// 
// Please direct all code related questions to:
// GotDotNet Workspace: http://www.gotdotnet.com/Community/Workspaces/workspace.aspx?id=e99fccb3-1a8c-42b5-90ee-348f6b77c407
// Yahoo Group http://groups.yahoo.com/group/DotText/
// 
///////////////////////////////////////////////////////////////////////////////////////////////////

#endregion

using System.Collections;
using System.IO;
using System.Text;
using System.Web;
using System.Xml;
using System.Xml.Serialization;

namespace Dottext.Web.Admin
{
	public class SiteMap
	{
		protected const string DEFAULT_FILENAME = "navigation.config";

		private static SiteMap _instance;
		private Hashtable _pages;
		private PageLocation _root;
		private bool _isConfigured;

		static SiteMap()
		{
			_instance = new SiteMap();
		}

		protected SiteMap()
		{
			_pages = new Hashtable();
		}

		public static SiteMap Instance
		{
			get { return _instance; }
		}

		public PageLocation this[string index]
		{
			get { return (PageLocation) _pages[index]; }
			set { _pages[index] = value; }
		}

		public PageLocation Root
		{
			get { return _root; }
		}

		public bool IsConfigured
		{
			get { return _isConfigured; }
		}

		public static void LoadConfiguration()
		{
			LoadConfiguration(DEFAULT_FILENAME);
		}

		// Change to ConfigHandler?
		public static void LoadConfiguration(string filePath)
		{
			string filepath = HttpContext.Current.Server.MapPath(filePath);

			XmlDocument doc = new XmlDocument();
			doc.Load(filepath);

			XmlNode pageLocations = doc.SelectSingleNode("/Navigation/RootPage");
			if (null != pageLocations)
			{
				//Begin: Scott的源码
				//System.Text.Encoding encoding = Utilities.GetEncoding(filepath);				
				//End: Scott的源码

				//Utilities.GetEncoding似乎不能正确判断文件的编码，所以这里只好暂时用一个Dirty的方法了
				//什么时候有空，再去看这个方法的问题所在
				Encoding encoding = Encoding.UTF8;
				//韩磊修改于20040301

				byte[] buffer = encoding.GetBytes(pageLocations.OuterXml);
				MemoryStream stream = new MemoryStream(buffer);
				stream.Position = 0;
				XmlSerializer serializer = new XmlSerializer(typeof (PageLocation));
				PageLocation newRoot = (PageLocation) serializer.Deserialize(stream);
				_instance.SetRoot(PageLocation.GetRootPage(newRoot));
				_instance.PopulateLookupList();
			}

			_instance._isConfigured = true;
		}

		public bool ContainsID(string id)
		{
			return _pages.ContainsKey(id);
		}

		public PageLocation[] GetAncestors(string id)
		{
			return GetAncestors(id, true);
		}

		public PageLocation[] GetAncestors(string id, bool includeSelf)
		{
			if (_pages.ContainsKey(id))
				return (_pages[id] as PageLocation).GetAncestors(includeSelf);
			else
				return null;
		}

		public void AddPage(PageLocation value)
		{
			_pages.Add(value.ID, value);
		}

		protected void ClearPages()
		{
			_pages.Clear();
		}

		protected void SetRoot(PageLocation root)
		{
			_root = root;
		}

		protected void PopulateLookupList()
		{
			ClearPages();
			RecursePageLocations(_root);
		}

		protected void RecursePageLocations(PageLocation currentLocation)
		{
			if (currentLocation.HasChildren)
			{
				foreach (PageLocation childLocation in currentLocation.ChildLocations)
				{
					childLocation.SetParent(currentLocation);
					RecursePageLocations(childLocation);
				}
			}

			AddPage(currentLocation);
		}
	}
}