htmlimagerenderer.java

一个使用struts+hibernate+spring开发的完的网站源代码。

/*
 * 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 org.apache.myfaces.renderkit.JSFAttr;
import org.apache.myfaces.renderkit.RendererUtils;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

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 Thomas Spiegl (latest modification by $Author: matze $)
 * @author Anton Koinov
 * @version $Revision: 1.11 $ $Date: 2004/10/13 11:51:00 $
 * $Log: HtmlImageRenderer.java,v $
 * Revision 1.11  2004/10/13 11:51:00  matze
 * renamed packages to org.apache
 *
 * Revision 1.10  2004/07/01 22:05:07  mwessendorf
 * ASF switch
 *
 * Revision 1.9  2004/05/18 11:59:13  manolito
 * id attribute is rendered now
 *
 */
public class HtmlImageRenderer
extends HtmlRenderer
{
    private static final Log log = LogFactory.getLog(HtmlImageRenderer.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);

            writer.writeAttribute(HTML.ID_ATTR, uiComponent.getClientId(facesContext), null);

            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).");
        }
    }
}