/**********************************************************************************
* $URL: https://source.sakaiproject.org/svn/sam/trunk/samigo-app/src/java/org/sakaiproject/tool/assessment/jsf/renderer/StylesheetRenderer.java $
* $Id: StylesheetRenderer.java 106463 2012-04-02 12:20:09Z david.horwitz@uct.ac.za $
***********************************************************************************
*
* Copyright (c) 2004, 2005, 2006, 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.tool.assessment.jsf.renderer;
import java.io.IOException;
import javax.faces.component.UIComponent;
import javax.faces.component.UIOutput;
import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;
import javax.faces.render.Renderer;
/**
* <p>Description: </p>
* <p>Render a stylesheet link for the value of our component's
* <code>path</code> attribute, prefixed by the context path of this
* web application.</p>
* <p> Based on example code by Sun Microsystems. </p>
* <p>Copyright: Copyright (c) 2004</p>
* <p>Organization: Sakai Project</p>
* @author Ed Smiley
* @version $Id: StylesheetRenderer.java 106463 2012-04-02 12:20:09Z david.horwitz@uct.ac.za $
*/
public class StylesheetRenderer extends Renderer
{
public boolean supportsComponentType(UIComponent component)
{
return (component instanceof UIOutput);
}
public void decode(FacesContext context, UIComponent component)
{
}
public void encodeBegin(FacesContext context, UIComponent component)
throws IOException
{
;
}
public void encodeChildren(FacesContext context, UIComponent component)
throws IOException
{
;
}
/**
* <p>Render a relative HTML <code><link></code> element for a
* <code>text/css</code> stylesheet at the specified context-relative
* path.</p>
*
* @param context FacesContext for the request we are processing
* @param component UIComponent to be rendered
*
* @throws IOException if an input/output error occurs while rendering
* @throws NullPointerException if <code>context</code>
* or <code>component</code> is null
*/
public void encodeEnd(FacesContext context, UIComponent component)
throws IOException
{
if ( (context == null) || (component == null))
{
throw new NullPointerException();
}
ResponseWriter writer = context.getResponseWriter();
String contextPath = context.getExternalContext()
.getRequestContextPath();
writer.write("<link rel=\"stylesheet\" type=\"text/css\" href=\"");
writer.write(contextPath);
writer.write( (String) component.getAttributes().get("path"));
writer.write("\"/>");
}
}