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$URL: https://source.sakaiproject.org/svn/jsf/tags/sakai-10.0/jsf-widgets/src/java/org/sakaiproject/jsf/renderer/CourierRenderer.java $ $Id: CourierRenderer.java 105077 2012-02-24 22:54:29Z ottenhoff@longsight.com $ Copyright (c) 2005, 2006, 2007, 2008 The Sakai Foundation Licensed under the Educational Community License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.opensource.org/licenses/ECL-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. /
 
 
 
 package org.sakaiproject.jsf.renderer;
 
 
 
 
 
 public class CourierRenderer extends Renderer
 {
 	
 			ComponentManager.get(SessionManager.class);
 	
 	public boolean supportsComponentType(UIComponent component)
 	{
 		return (component instanceof UIOutput);
 	}
 
 	public void decode(FacesContext contextUIComponent component)
 	{
 	}
 
 	public void encodeBegin(FacesContext contextUIComponent componentthrows IOException
 	{
 	}
 
 	public void encodeChildren(FacesContext contextUIComponent componentthrows IOException
 	{
 	}
 
 
 	public void encodeEnd(FacesContext contextUIComponent componentthrows IOException
 	{
 		ResponseWriter writer = context.getResponseWriter();
 
 		// update time, in seconds
 		String updateTime = (String) RendererUtil.getAttribute(contextcomponent"refresh");
 		if (updateTime == null || updateTime.length() == 0)
 		{
 			updateTime = "10";
 		}
 		
 		// the current tool's placement ID
 		String placementId = (Stringreq.getAttribute("sakai.tool.placement.id");
 		if (placementId == null)
 		{
 			try {
 				throw new Exception("Placement ID is null in request: sakai.tool.placement.id");
 			} catch (Exception e) {
 			}
 		}
 		
 		// the current user's ID
 		if (userId == null)
 		{
 			try {
 				throw new Exception("User ID is null in session");
 			} catch (Exception e) {
 			}
 		}
 		
 		writer.write("<script type=\"text/javascript\" language=\"JavaScript\">\n");
 		writer.write("updateTime = " + updateTime + "000;\n");
 		writer.write("updateUrl = \"" + serverUrl(req) + "/courier/" + placementId);
		writer.write("?userId="+userId+"\";\n");
		writer.write("scheduleUpdate();\n");
		writer.write("</script>\n");
	}

This method is a duplicate of org.sakaiproject.util.web.Web.serverUrl() Duplicated here from org.sakaiproject.util.web.Web.java so that the JSF tag library doesn't have a direct jar dependency on more of Sakai.
	private static String serverUrl(HttpServletRequest req)
	{
		url.append(req.getScheme());
		url.append("://");
		if (((req.getServerPort() != 80) && (!req.isSecure())) || ((req.getServerPort() != 443) && (req.isSecure())))
		{
			url.append(":");
		}
		return url.toString();
	}
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