/**
* License Agreement.
*
* Rich Faces - Natural Ajax for Java Server Faces (JSF)
*
* Copyright (C) 2007 Exadel, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1 as published by the Free Software Foundation.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
package org.ajax4jsf.resource;
import java.awt.Dimension;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.DataOutputStream;
import java.io.IOException;
import java.util.Arrays;
import java.util.Date;
import org.ajax4jsf.resource.image.animatedgif.AnimatedGifEncoder;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
public abstract class AnimationResource extends InternetResourceBase {
private static final Log log = LogFactory.getLog(AnimationResource.class);
protected abstract Dimension getFrameSize(ResourceContext resourceContext);
public AnimationResource() {
setRenderer(new GifRenderer());
setLastModified(new Date(InternetResourceBuilder.getInstance().getStartTime()));
}
protected abstract int getNumberOfFrames();
protected int getRepeat() {
return -1;
}
private int[] delays;
protected int[] getFrameDelays() {
if (delays == null) {
delays = new int[getNumberOfFrames()];
Arrays.fill(delays, 0);
}
return delays;
}
private int currFrameIndex = 0;
public void send(ResourceContext context) throws IOException {
try {
DataOutputStream output = new DataOutputStream(context.getOutputStream());
Dimension frameSize = getFrameSize(context);
int numberOfFrames = getNumberOfFrames();
BufferedImage frame = null;
currFrameIndex = 0;
if (frameSize.getHeight() > 0.0 && frameSize.getWidth() > 0.0
&& numberOfFrames > 0) {
AnimatedGifEncoder encoder = new AnimatedGifEncoder();
encoder.start(output);
encoder.setRepeat(getRepeat());
int[] delays = getFrameDelays();
ImageRenderer renderer = (ImageRenderer) getRenderer(null);
while (currFrameIndex < numberOfFrames) {
frame = renderer.createImage(frameSize.width,
frameSize.height);
Graphics2D graphics = frame.createGraphics();
paint(context, graphics, currFrameIndex++);
graphics.dispose();
encoder.addFrame(frame);
if (delays != null && delays.length > currFrameIndex) {
encoder.setDelay(delays[currFrameIndex]);
}
}
encoder.finish();
}
output.flush();
output.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
protected abstract void paint(ResourceContext context, Graphics2D graphics2D, int frameIndex);
}