/*

  * Licensed to the Apache Software Foundation (ASF) under one

  * or more contributor license agreements.  See the NOTICE file

  * distributed with this work for additional information

  * regarding copyright ownership.  The ASF licenses this file

  * to you under the Apache 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.apache.org/licenses/LICENSE-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.apache.myfaces.renderkit.html;

 import java.io.IOException;

 import java.util.List;

 import javax.faces.application.ProjectStage;

 import javax.faces.component.UIComponent;

 import javax.faces.component.UIViewRoot;

 import javax.faces.context.FacesContext;

 import javax.faces.context.ResponseWriter;

 import javax.faces.render.Renderer;

 import org.apache.myfaces.buildtools.maven2.plugin.builder.annotation.JSFRenderer;

 import org.apache.myfaces.shared.config.MyfacesConfig;

 import org.apache.myfaces.shared.renderkit.html.HTML;

 import org.apache.myfaces.shared.renderkit.html.HtmlRendererUtils;

 /**

  * Renderer used by h:head component

  * 

  * @since 2.0

  * @author Leonardo Uribe (latest modification by $Author$)

  * @version $Revision$ $Date$

  */

 @JSFRenderer(renderKitId = "HTML_BASIC", family = "javax.faces.Output", type = "javax.faces.Head")

 public class HtmlHeadRenderer extends Renderer

 {

     //TODO: Move constants to shared HTML class

     private final static String HEAD_ELEM = "head";

     private final static String HEAD_TARGET = HEAD_ELEM;

     private final static String PROFILE_ATTR = "profile";

     private final static String[] HEAD_PASSTHROUGH_ATTRIBUTES = { HTML.DIR_ATTR,

             HTML.LANG_ATTR, PROFILE_ATTR};

     @Override

     public void encodeBegin(FacesContext facesContext, UIComponent component)

             throws IOException

     {

         super.encodeBegin(facesContext, component); //check for NP

         ResponseWriter writer = facesContext.getResponseWriter();

         writer.startElement(HEAD_ELEM, component);

         HtmlRendererUtils.writeIdIfNecessary(writer, component, facesContext);

         HtmlRendererUtils.renderHTMLAttributes(writer, component,

                 HEAD_PASSTHROUGH_ATTRIBUTES);

         HtmlRendererUtils.renderHTMLAttribute(writer, component, HTML.XMLNS_ATTR , HTML.XMLNS_ATTR);

     }

     @Override

     public void encodeEnd(FacesContext facesContext, UIComponent component)

             throws IOException

     {

         super.encodeEnd(facesContext, component); //check for NP

         ResponseWriter writer = facesContext.getResponseWriter();

         UIViewRoot root = facesContext.getViewRoot();

         List<UIComponent> componentResources = root.getComponentResources(facesContext,

                 HEAD_TARGET);

         for (int i = 0, childCount = componentResources.size(); i < childCount; i++)

         {

             UIComponent child = componentResources.get(i);

             child.encodeAll(facesContext);

         }

         writer.endElement(HEAD_ELEM);

         if (MyfacesConfig.getCurrentInstance(facesContext.getExternalContext()).isEarlyFlushEnabled() &&

                 facesContext.isProjectStage(ProjectStage.Production))

         {

             writer.flush();

         }

     }

 }