adapdev-commits

[Sean M. <int...@us...>]

Update of /cvsroot/adapdev/Adapdev/src/Adapdev.NVelocity/Dvsl
In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv11652/src/Adapdev.NVelocity/Dvsl

Added Files:
	TemplateHandler.cs 
Log Message:


--- NEW FILE: TemplateHandler.cs ---
namespace NVelocity.Dvsl
{
	using System;
	using System.Collections;
	using System.IO;
	using System.Xml;
	using System.Xml.XPath;
	using NVelocity.Context;
	using NVelocity.Runtime.Parser.Node;

	/// <summary>
	/// Currently provides the match rule accumulation
	/// as well as the AST storage and rendering
	/// 
	/// Rule stuff might be replaced with the dom4j RuleManager
	/// </summary>
	/// <author> <a href="mailto:ge...@ap...?">Geir Magnusson Jr.</a></author>
	public class TemplateHandler
	{
		public TemplateHandler()
		{
		}

		private Hashtable astmap = new Hashtable();
		private IList xpathList = new ArrayList();

		public virtual void RegisterMatch(String xpath, SimpleNode node)
		{
			Hashtable foo = new Hashtable();
			foo["xpath"] = xpath;
			foo["ast"] = node;
			xpathList.Add(foo);
		}


		internal virtual bool Render(DvslNode node, IContext context, TextWriter writer)
		{
			/*
	    *  find if we have an AST where the xpath expression mathes
	    *  for this node
	    */

			XmlNode dom4jnode = (XmlNode) node.NodeImpl;
			XPathNavigator nav = dom4jnode.CreateNavigator();
			SimpleNode sn = null;

			for (int i = 0; i < xpathList.Count; i++)
			{
				Hashtable m = (Hashtable) xpathList[i];

				XPathExpression expr = nav.Compile((String) m["xpath"]);

				if (nav.Matches((String) m["xpath"]))
				{
					sn = (SimpleNode) m["ast"];
					break;
				}
			}

			// if we found something, render
			if (sn != null)
			{
				InternalContextAdapterImpl ica = new InternalContextAdapterImpl(context);
				ica.PushCurrentTemplateName(node.Name);

				try
				{
					sn.render(ica, writer);
				}
				finally
				{
					ica.PopCurrentTemplateName();
				}

				return true;
			}

			return false;
		}


	}
}