/*

  * 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 javax.faces.component.UIComponent;

 import javax.faces.component.ValueHolder;

 import javax.faces.component.html.HtmlOutputLabel;

 import javax.faces.context.FacesContext;

 import javax.faces.context.ResponseWriter;

 import org.apache.commons.logging.Log;

 import org.apache.commons.logging.LogFactory;

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

 import org.apache.myfaces.shared_impl.renderkit.JSFAttr;

 import org.apache.myfaces.shared_impl.renderkit.RendererUtils;

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

 import org.apache.myfaces.shared_impl.renderkit.html.HtmlRenderer;

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

 /**

  *   

  * @author Thomas Spiegl (latest modification by $Author: lu4242 $)

  * @author Anton Koinov

  * @author Martin Marinschek

  * @version $Revision: 693358 $ $Date: 2008-09-08 22:54:29 -0500 (Mon, 08 Sep 2008) $

  */

 @JSFRenderer(

     renderKitId="HTML_BASIC",

     family="javax.faces.Output",

     type="javax.faces.Label")

 public class HtmlLabelRenderer

 extends HtmlRenderer

 {

     private static final Log log = LogFactory.getLog(HtmlLabelRenderer.class);

     public void encodeBegin(FacesContext facesContext, UIComponent uiComponent)

             throws IOException

     {

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

         ResponseWriter writer = facesContext.getResponseWriter();

         encodeBefore(facesContext, writer, uiComponent);

         writer.startElement(HTML.LABEL_ELEM, uiComponent);

         HtmlRendererUtils.writeIdIfNecessary(writer, uiComponent, facesContext);

         HtmlRendererUtils.renderHTMLAttributes(writer, uiComponent, HTML.LABEL_PASSTHROUGH_ATTRIBUTES);

         String forAttr = getFor(uiComponent);

         if (forAttr != null)

         {

           writer.writeAttribute(HTML.FOR_ATTR,

                                 getClientId(facesContext, uiComponent, forAttr), JSFAttr.FOR_ATTR);

         }

         else

         {

             if (log.isWarnEnabled()) {

                 log.warn("Attribute 'for' of label component with id " + uiComponent.getClientId(facesContext)+" is not defined");

             }

         }

         //MyFaces extension: Render a label text given by value

         //TODO: Move to extended component

         if (uiComponent instanceof ValueHolder)

         {

             String text = RendererUtils.getStringValue(facesContext, uiComponent);

             if(text != null)

             {

                 writer.writeText(text, "value");

             }

         }

         writer.flush(); // close start tag

         encodeAfterStart(facesContext,writer,uiComponent);

     }

     protected void encodeAfterStart(FacesContext facesContext, ResponseWriter writer, UIComponent uiComponent)

         throws IOException

     {

     }

     protected void encodeBefore(FacesContext facesContext, ResponseWriter writer, UIComponent uiComponent)

         throws IOException

     {

     }

     protected String getFor(UIComponent component)

     {

         if (component instanceof HtmlOutputLabel)

         {

             return ((HtmlOutputLabel)component).getFor();

         }

         return (String) component.getAttributes().get(JSFAttr.FOR_ATTR);

     }

     protected String getClientId(FacesContext facesContext,

                                  UIComponent uiComponent, String forAttr)

     {

         return RendererUtils.getClientId(facesContext, uiComponent, forAttr);

     }

     public void encodeEnd(FacesContext facesContext, UIComponent uiComponent)

             throws IOException

     {

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

         ResponseWriter writer = facesContext.getResponseWriter();

         encodeBeforeEnd(facesContext, writer, uiComponent);

         writer.endElement(HTML.LABEL_ELEM);

         encodeAfter(facesContext, writer, uiComponent);

     }

     protected void encodeBeforeEnd(FacesContext facesContext, ResponseWriter writer, UIComponent uiComponent)

         throws IOException

     {

     }

     protected void encodeAfter(FacesContext facesContext, ResponseWriter writer, UIComponent uiComponent)

         throws IOException

     {

     }

 }