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The MyFaces Commons Subproject provides base classes for usage in both the MyFaces implementation and the MyFaces Tomahawk components. This is also a general set of utility classes for usage in your JSF projects independent of the implementation you might be deciding upon.

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/*
 * Copyright 2004 The Apache Software Foundation.
 *
 * Licensed 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.UIGraphic;
import javax.faces.component.html.HtmlGraphicImage;
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.renderkit.JSFAttr;
import org.apache.myfaces.renderkit.RendererUtils;


/**
 * @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
	    {
	        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);
	        }

	        if ((url != null) && (url.length() > 0))
	        {
	            writer.startElement(HTML.IMG_ELEM, uiComponent);
	            
	            HtmlRendererUtils.writeIdIfNecessary(writer, uiComponent, facesContext);

	            String src = facesContext.getApplication()
	                            .getViewHandler().getResourceURL(facesContext, url);
	            writer.writeURIAttribute(HTML.SRC_ATTR,
	                                     facesContext.getExternalContext().encodeResourceURL(src),
	                                     null);

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

	            writer.endElement(HTML.IMG_ELEM);
	        }
	        else
	        {
	            if (log.isWarnEnabled()) log.warn("Graphic with id " + uiComponent.getClientId(facesContext) + " has no value (url).");
	        }
	    }

}