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Ajax4jsf is an open source extension to the JavaServer Faces standard that adds AJAX capability to JSF applications without requiring the writing of any JavaScript.
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/**
* Licensed under the Common Development and Distribution License,
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.sun.com/cddl/
*
* 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.ajax4jsf.framework.resource;
import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;
import javax.faces.FacesException;
import javax.faces.FactoryFinder;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;
import javax.faces.render.RenderKit;
import javax.faces.render.RenderKitFactory;
import org.ajax4jsf.framework.renderer.RendererBase;
import org.ajax4jsf.framework.renderer.compiler.HtmlCompiler;
import org.ajax4jsf.framework.renderer.compiler.PreparedTemplate;
import org.ajax4jsf.framework.renderer.compiler.TemplateContext;
import org.ajax4jsf.framework.skin.SkinFactory;
/**
* @author shura
*
*/
public class TemplateCSSRenderer extends StyleRenderer {
private static final String COMPILED_TEMPLATE_PROPERTY = "compiled-template";
private RendererBase renderer = new RendererBase() {
protected Class getComponentClass() {
// TODO Auto-generated method stub
return UIComponent.class;
}
};
/* (non-Javadoc)
* @see org.ajax4jsf.framework.resource.BaseResourceRenderer#send(org.ajax4jsf.framework.resource.InternetResource, org.ajax4jsf.framework.resource.ResourceContext)
*/
public int send(InternetResource base, ResourceContext context) throws IOException {
PreparedTemplate template = null;
template = getTemplate(base, context);
FacesContext facesContext = FacesContext.getCurrentInstance();
if(null != facesContext) {
// Create responseWriter.
String defaultRenderKitId = facesContext.getApplication().getDefaultRenderKitId();
if (null == defaultRenderKitId) {
defaultRenderKitId = RenderKitFactory.HTML_BASIC_RENDER_KIT;
}
RenderKitFactory renderKitFactory = (RenderKitFactory) FactoryFinder.getFactory(FactoryFinder.RENDER_KIT_FACTORY);
RenderKit renderKit = renderKitFactory.getRenderKit(facesContext,defaultRenderKitId);
// TODO - handle response encoding
ResponseWriter responseWriter = renderKit.createResponseWriter(context.getWriter(),null,"UTF-8");
facesContext.setResponseWriter(responseWriter);
responseWriter.startDocument();
// TODO - parameters and mock renderer/component ?
// for first time, this template only allow skin or faces variables interaction
template.encode(renderer,facesContext,null);
responseWriter.endDocument();
responseWriter.flush();
responseWriter.close();
} else {
throw new FacesException("FacesContext for resource from template "+base.getKey()+" is null");
}
return 0;
}
/**
* @param base
* @param context
* @return
* @throws IOException
*/
public PreparedTemplate getTemplate(InternetResource base, ResourceContext context) throws IOException {
PreparedTemplate template;
// if(base.isCacheable()){
template = (PreparedTemplate) base.getProperty(COMPILED_TEMPLATE_PROPERTY);
// }
if(null == template){
HtmlCompiler compiler = new HtmlCompiler();
InputStream resourceAsStream = base.getResourceAsStream(context);
template = compiler.compile(resourceAsStream, base.getKey());
base.setProperty(COMPILED_TEMPLATE_PROPERTY, template);
resourceAsStream.close();
}
return template;
}
/* (non-Javadoc)
* @see org.ajax4jsf.framework.resource.BaseResourceRenderer#requireFacesContext()
*/
public boolean requireFacesContext() {
return true;
}
public Object getData(InternetResource base, FacesContext context, Object data) {
ResourceContext resourceContext = new FacesResourceContext(context);
PreparedTemplate template;
try {
template = getTemplate(base, resourceContext);
} catch (IOException e) {
return null;
}
UIComponent component = (UIComponent) (data instanceof UIComponent ? data:null);
TemplateContext templateContext = new TemplateContext(null,context,component);
Object value = template.getValue(templateContext);
if(null == value){
int hashCode = SkinFactory.getInstance().getSkin(context).hashCode(context);
value = ByteBuffer.allocate(4).putInt(hashCode).array();
}
return value;
}
}