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    1   /*
    2    * Licensed to the Apache Software Foundation (ASF) under one
    3    * or more contributor license agreements.  See the NOTICE file
    4    * distributed with this work for additional information
    5    * regarding copyright ownership.  The ASF licenses this file
    6    * to you under the Apache License, Version 2.0 (the
    7    * "License"); you may not use this file except in compliance
    8    * with the License.  You may obtain a copy of the License at
    9    *
    10   *   http://www.apache.org/licenses/LICENSE-2.0
    11   *
    12   * Unless required by applicable law or agreed to in writing,
    13   * software distributed under the License is distributed on an
    14   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    15   * KIND, either express or implied.  See the License for the
    16   * specific language governing permissions and limitations
    17   * under the License.
    18   */
    19  package org.apache.myfaces.shared_orchestra.renderkit.html;
    20
    21  import java.io.IOException;
    22
    23  import javax.faces.component.UIComponent;
    24  import javax.faces.component.UIGraphic;
    25  import javax.faces.component.html.HtmlGraphicImage;
    26  import javax.faces.context.FacesContext;
    27  import javax.faces.context.ResponseWriter;
    28
    29  import org.apache.commons.logging.Log;
    30  import org.apache.commons.logging.LogFactory;
    31  import org.apache.myfaces.shared_orchestra.renderkit.JSFAttr;
    32  import org.apache.myfaces.shared_orchestra.renderkit.html.HTML;
    33
    34
    35  /**
    36   * @author Manfred Geiler (latest modification by $Author: grantsmith $)
    37   * @author Thomas Spiegl
    38   * @author Anton Koinov
    39   * @version $Revision$ $Date: 2005-05-11 18:45:06 +0200 (Wed, 11 May 2005) $
    40   */
    41  public class HtmlImageRendererBase
    42          extends HtmlRenderer
    43  {
    44       private static final Log log = LogFactory.getLog(HtmlImageRendererBase.class);
    45
    46          public void encodeEnd(FacesContext facesContext, UIComponent uiComponent)
    47                  throws IOException
    48          {
    49              org.apache.myfaces.shared_orchestra.renderkit.RendererUtils.checkParamValidity(facesContext, uiComponent, UIGraphic.class);
    50
    51              ResponseWriter writer = facesContext.getResponseWriter();
    52
    53              String url;
    54              if (uiComponent instanceof HtmlGraphicImage)
    55              {
    56                  url = ((HtmlGraphicImage)uiComponent).getUrl();
    57              }
    58              else
    59              {
    60                  url = (String)uiComponent.getAttributes().get(JSFAttr.URL_ATTR);
    61              }
    62
    63              writer.startElement(HTML.IMG_ELEM, uiComponent);
    64
    65              HtmlRendererUtils.writeIdIfNecessary(writer, uiComponent, facesContext);
    66
    67              if ((url != null) && (url.length() > 0))
    68              {
    69
    70                  String src = facesContext.getApplication()
    71                                  .getViewHandler().getResourceURL(facesContext, url);
    72                  writer.writeURIAttribute(HTML.SRC_ATTR,
    73                                           facesContext.getExternalContext().encodeResourceURL(src),
    74                                           null);
    75              }
    76              else
    77              {
    78                  if (log.isWarnEnabled()) log.warn("Graphic with id " + uiComponent.getClientId(facesContext) + " has no value (url).");
    79              }
    80
    81              /*
    82               * Warn the user if the ALT attribute is missing.
    83               */
    84              if (uiComponent.getAttributes().get(HTML.ALT_ATTR) == null)
    85              {
    86                  log.warn("ALT attribute is missing for : " + uiComponent.getId());
    87              }
    88
    89              HtmlRendererUtils.renderHTMLAttributes(writer, uiComponent, HTML.IMG_PASSTHROUGH_ATTRIBUTES);
    90
    91              writer.endElement(org.apache.myfaces.shared_orchestra.renderkit.html.HTML.IMG_ELEM);
    92          }
    93
    94  }