org.ajax4jsf.resource.AnimationResource.java Source code

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Here is the source code for org.ajax4jsf.resource.AnimationResource.java

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/**
 * 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);

}