/*

  *  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.shared_impl.renderkit.html;

 import org.apache.commons.logging.Log;

 import org.apache.commons.logging.LogFactory;

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

 import javax.faces.component.UIComponent;

 import javax.faces.component.UIGraphic;

 import javax.faces.component.html.HtmlGraphicImage;

 import javax.faces.context.FacesContext;

 import javax.faces.context.ResponseWriter;

 import java.io.IOException;

 /**

  * @author Manfred Geiler (latest modification by $Author: grantsmith $)

  * @author Thomas Spiegl

  * @author Anton Koinov

  * @version $Revision$ $Date: 2005-05-11 18:45:06 +0200 (Wed, 11 May 2005) $

  */

 public class HtmlImageRendererBase

         extends HtmlRenderer

 {

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

     public void encodeEnd(FacesContext facesContext, UIComponent uiComponent)

             throws IOException

     {

         org.apache.myfaces.shared_impl.renderkit.RendererUtils.checkParamValidity(facesContext, uiComponent, UIGraphic.class);

         ResponseWriter writer = facesContext.getResponseWriter();

         String url;

         if (uiComponent instanceof HtmlGraphicImage)

         {

             url = ((HtmlGraphicImage) uiComponent).getUrl();

         }

         else

         {

             url = (String) uiComponent.getAttributes().get(JSFAttr.URL_ATTR);

         }

         writer.startElement(HTML.IMG_ELEM, uiComponent);

         HtmlRendererUtils.writeIdIfNecessary(writer, uiComponent, facesContext);

         if (url != null && url.length() > 0)

         {

             String src = facesContext.getApplication()

                     .getViewHandler().getResourceURL(facesContext, url);

             writer.writeURIAttribute(HTML.SRC_ATTR,

                     facesContext.getExternalContext().encodeResourceURL(src),

                     JSFAttr.VALUE_ATTR);

         }

         else

         {

             if (log.isWarnEnabled()) log.warn("Graphic with id " + uiComponent.getClientId(facesContext) + " has no value (url).");

         }

         /* 

          * Warn the user if the ALT attribute is missing.

          */                

         if (uiComponent.getAttributes().get(HTML.ALT_ATTR) == null) 

         {

             log.warn("ALT attribute is missing for : " + uiComponent.getId());

         }

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

         writer.endElement(org.apache.myfaces.shared_impl.renderkit.html.HTML.IMG_ELEM);

     }

 }