/*
* Copyright 2009-2011 Prime Technology.
*
* 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.primefaces.component.graphicimage;
import java.io.IOException;
import java.util.Map;
import java.util.UUID;
import javax.faces.application.Resource;
import javax.faces.component.UIComponent;
import javax.faces.component.UIParameter;
import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;
import org.primefaces.application.PrimeResourceHandler;
import org.primefaces.model.StreamedContent;
import org.primefaces.renderkit.CoreRenderer;
import org.primefaces.util.HTML;
public class GraphicImageRenderer extends CoreRenderer {
@Override
public void encodeEnd(FacesContext context, UIComponent component) throws IOException {
ResponseWriter writer = context.getResponseWriter();
GraphicImage image = (GraphicImage) component;
String clientId = image.getClientId(context);
String imageSrc = getImageSrc(context, image);
writer.startElement("img", image);
writer.writeAttribute("id", clientId, "id");
writer.writeAttribute("src", imageSrc, null);
if(image.getAlt() == null) writer.writeAttribute("alt", "", null);
if(image.getStyleClass() != null) writer.writeAttribute("class", image.getStyleClass(), "styleClass");
renderPassThruAttributes(context, image, HTML.IMG_ATTRS);
writer.endElement("img");
}
protected String getImageSrc(FacesContext context, GraphicImage image) {
String src = null;
Object value = image.getValue();
if(value == null) {
src = "";
}
else {
if(value instanceof StreamedContent) {
StreamedContent streamedContent = (StreamedContent) value;
Resource resource = context.getApplication().getResourceHandler().createResource("dynamiccontent", "primefaces", streamedContent.getContentType());
String resourcePath = resource.getRequestPath();
String rid = createUniqueContentId(context);
StringBuilder builder = new StringBuilder(resourcePath);
builder.append("&").append(PrimeResourceHandler.DYNAMIC_CONTENT_PARAM).append("=").append(rid);
for(UIComponent kid : image.getChildren()) {
if(kid instanceof UIParameter) {
UIParameter param = (UIParameter) kid;
builder.append("&").append(param.getName()).append("=").append(param.getValue());
}
}
src = builder.toString();
context.getExternalContext().getSessionMap().put(rid, image.getValueExpression("value").getExpressionString());
}
else {
src = getResourceURL(context, (String) value);
}
//Add caching if needed
if(!image.isCache()) {
src += src.contains("?") ? "&" : "?";
src = src + "primefaces_image=" + UUID.randomUUID().toString();
}
}
return src;
}
protected String createUniqueContentId(FacesContext context) {
Map<String,Object> session = context.getExternalContext().getSessionMap();
String key = generateKey();
while(session.containsKey(key)) {
key = generateKey();
}
return key;
}
protected String generateKey() {
StringBuilder builder = new StringBuilder();
return builder.append(PrimeResourceHandler.DYNAMIC_CONTENT_PARAM).append("_").append(UUID.randomUUID().toString()).toString();
}
}