/*
* Copyright 2009 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.application;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.font.FontRenderContext;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.el.ELContext;
import javax.el.ValueExpression;
import javax.faces.context.FacesContext;
import javax.faces.event.PhaseEvent;
import javax.faces.event.PhaseId;
import javax.faces.event.PhaseListener;
import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletResponse;
import org.primefaces.component.graphictext.GraphicTextRenderer;
import org.primefaces.model.StreamedContent;
public class DynamicContentStreamer implements PhaseListener {
public static final String DYNAMIC_CONTENT_PARAM = "primefacesDynamicContent";
public static final String CONTENT_TYPE_PARAM = "contentType";
public static final String GRAPHIC_TEXT_PARAM = "primefacesGraphicText";
private Logger logger = Logger.getLogger(DynamicContentStreamer.class.getName());
public void beforePhase(PhaseEvent phaseEvent) {
FacesContext facesContext = phaseEvent.getFacesContext();
Map<String,String> params = facesContext.getExternalContext().getRequestParameterMap();
if(params.containsKey(DYNAMIC_CONTENT_PARAM))
streamDynamicContent(facesContext, params.get(DYNAMIC_CONTENT_PARAM));
else if(params.containsKey(GRAPHIC_TEXT_PARAM))
streamGraphicText(facesContext, params);
}
private void streamDynamicContent(FacesContext facesContext, String expression) {
HttpServletResponse response = (HttpServletResponse) facesContext.getExternalContext().getResponse();
ELContext elContext = facesContext.getELContext();
ValueExpression ve = facesContext.getApplication().getExpressionFactory().createValueExpression(elContext, "#{" + expression + "}", StreamedContent.class);
StreamedContent content = (StreamedContent) ve.getValue(elContext);
if(content != null) {
if(logger.isLoggable(Level.FINE))
logger.log(Level.FINE, "Streaming image: {0}", ve.getExpressionString());
try {
response.setContentType(content.getContentType());
byte[] buffer = new byte[2048];
int length;
while ((length = (content.getStream().read(buffer))) >= 0) {
response.getOutputStream().write(buffer, 0, length);
}
finalizeResponse(facesContext);
}
catch (IOException e) {
logger.log(Level.WARNING, "Exception in streaming image {0}", ve.getExpressionString());
}
}
}
private void streamGraphicText(FacesContext facesContext, Map<String,String> params) {
try {
HttpServletResponse response = (HttpServletResponse) facesContext.getExternalContext().getResponse();
String fontNameVal = params.get(GraphicTextRenderer.KEY_FONTNAME);
String fontStyleVal = params.get(GraphicTextRenderer.KEY_FONTSTYLE);
String fontSizeVal = params.get(GraphicTextRenderer.KEY_FONTSIZE);
String graphicTextVal = params.get(GraphicTextRenderer.KEY_GRAPHICTEXT);
BufferedImage bufferedImg = createBufferedImage(fontNameVal, fontStyleVal, fontSizeVal, graphicTextVal);
OutputStream outputStream = response.getOutputStream();
ImageIO.write(bufferedImg, "jpg", outputStream);
finalizeResponse(facesContext);
}
catch (IOException e) {
logger.log(Level.SEVERE, "IOException in streaming graphic text image");
}
}
private BufferedImage createBufferedImage(String fontNameVal, String fontStyleVal, String fontSizeVal, String graphicTextVal) {
BufferedImage bufferedImg = new BufferedImage(1,1,BufferedImage.TYPE_INT_RGB);
Graphics2D g2 = bufferedImg.createGraphics();
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
int fontStyle = Font.PLAIN;
if ("bold".equals(fontStyleVal))
fontStyle = Font.BOLD;
if ("italic".equals(fontStyleVal))
fontStyle = Font.ITALIC;
Font font = new Font(fontNameVal, fontStyle, Integer.parseInt(fontSizeVal));
FontRenderContext fc = g2.getFontRenderContext();
Rectangle2D bounds = font.getStringBounds(graphicTextVal,fc);
// calculate the size of the text
int width = (int) bounds.getWidth();
int height = (int) bounds.getHeight();
bufferedImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
g2 = bufferedImg.createGraphics();
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2.setFont(font);
g2.setColor(Color.WHITE);
g2.fillRect(0,0,width,height);
g2.setColor(Color.BLACK);
g2.drawString(graphicTextVal, 0, (int)-bounds.getY());
return bufferedImg;
}
private void finalizeResponse(FacesContext facesContext) throws IOException {
HttpServletResponse response = (HttpServletResponse) facesContext.getExternalContext().getResponse();
response.setStatus(200);
response.getOutputStream().flush();
facesContext.responseComplete();
}
public void afterPhase(PhaseEvent phaseEvent) {
//Nothing to do here
}
public PhaseId getPhaseId() {
return PhaseId.RESTORE_VIEW;
}
}