org.ajax4jsf.resource.Java2Dresource.java Source code

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Here is the source code for org.ajax4jsf.resource.Java2Dresource.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.awt.image.RenderedImage;
import java.io.IOException;
import java.io.InputStream;

import javax.faces.FacesException;
import javax.faces.context.FacesContext;

import org.ajax4jsf.Messages;
import org.ajax4jsf.resource.ResourceContext;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * @author shura (latest modification by $Author: alexsmirnov $)
 * @version $Revision: 1.1.2.3 $ $Date: 2007/02/01 15:31:57 $
 * 
 */
public class Java2Dresource extends InternetResourceBase {
    private static final Log log = LogFactory.getLog(Java2Dresource.class);

    /**
     * Primary calculation of image dimensions - used when HTML code is
     * generated to render IMG's width and height Subclasses should override
     * this method to provide correct sizes of rendered images
     * 
     * @param facesContext
     * @return dimensions of the image to be displayed on page
     */
    public Dimension getDimensions(FacesContext facesContext, Object data) {
        return new Dimension(1, 1);
    }

    /**
     * Secondary calculation is used basically by {@link getImage} method
     * 
     * @param resourceContext
     * @return
     */
    protected Dimension getDimensions(ResourceContext resourceContext) {
        return new Dimension(1, 1);
    }

    /*
     * (non-Javadoc)
     * 
     * @see org.ajax4jsf.resource.InternetResourceBase#getResourceAsStream(javax.faces.context.FacesContext,
     *      java.lang.Object)
     */
    public InputStream getResourceAsStream(ResourceContext context) {
        // TODO Auto-generated method stub
        return super.getResourceAsStream(context);
    }

    /*
     * (non-Javadoc)
     * 
     * @see org.ajax4jsf.resource.InternetResourceBase#send(javax.faces.context.FacesContext,
     *      java.lang.Object)
     */
    public void send(ResourceContext context) throws IOException {
        ImageRenderer renderer = (ImageRenderer) getRenderer(null);
        try {
            RenderedImage image = getImage(context);
            if (null != image) {
                renderer.sendImage(context, image);

            }
        } catch (Exception e) {
            throw new FacesException(Messages.getMessage(Messages.SEND_IMAGE_ERROR_2), e);
        }
    }

    /**
     * Create {@link RenderedImage} for send to client. can be used as Java2d or
     * Java Advanced Imaging.
     * 
     * @param context
     * @return image to send.
     */
    protected RenderedImage getImage(ResourceContext context) {
        ImageRenderer renderer = (ImageRenderer) getRenderer(null);
        Dimension imageDimensions = getDimensions(context);
        BufferedImage image = null;
        if (imageDimensions.getHeight() > 0.0 && imageDimensions.getWidth() > 0.0) {
            image = renderer.createImage(imageDimensions.width, imageDimensions.height);
            Graphics2D graphics = image.createGraphics();
            paint(context, graphics);
            graphics.dispose();

        }
        return image;
    }

    /**
     * Template method for create image as Applet-like paint.
     * 
     * @param context -
     *            current resource context.
     * @param graphics2D -
     *            graphics to paint.
     */
    protected void paint(ResourceContext context, Graphics2D graphics2D) {
        // TODO Auto-generated method stub

    }
}