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jfreechart example source code file (ImageEncoderFactory.java)

This example jfreechart source code file (ImageEncoderFactory.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - jfreechart tags/keywords

class, classnotfoundexception, exception, hashtable, hashtable, illegalargumentexception, imageencoder, imageencoder, imageencoderfactory, string, string, unsupported, unsupported, util

The jfreechart ImageEncoderFactory.java source code

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2008, by Object Refinery Limited and Contributors.
 *
 * Project Info:  http://www.jfree.org/jfreechart/index.html
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or
 * (at your option) any later version.
 *
 * 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.
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
 * in the United States and other countries.]
 *
 * ------------------------
 * ImageEncoderFactory.java
 * ------------------------
 * (C) Copyright 2004-2008, by Richard Atkinson and Contributors.
 *
 * Original Author:  Richard Atkinson;
 * Contributor(s):   David Gilbert (for Object Refinery Limited);
 *
 * Changes
 * -------
 * 01-Aug-2004 : Initial version (RA);
 * 01-Nov-2005 : Now using ImageIO for JPEG encoding, so we no longer have a
 *               dependency on com.sun.* which isn't available on all
 *               implementations (DG);
 * 02-Feb-2007 : Removed author tags all over JFreeChart sources (DG);
 *
 */

package org.jfree.chart.encoders;

import java.util.Hashtable;

/**
 * Factory class for returning {@link ImageEncoder}s for different
 * {@link ImageFormat}s.
 */
public class ImageEncoderFactory {

    /** Storage for the encoders. */
    private static Hashtable encoders = null;

    static {
        init();
    }

    /**
     * Sets up default encoders (uses Sun PNG Encoder if JDK 1.4+ and the
     * SunPNGEncoderAdapter class is available).
     */
    private static void init() {
        encoders = new Hashtable();
        encoders.put("jpeg", "org.jfree.chart.encoders.SunJPEGEncoderAdapter");
        try {
            //  Test for being run under JDK 1.4+
            Class.forName("javax.imageio.ImageIO");
            //  Test for JFreeChart being compiled under JDK 1.4+
            Class.forName("org.jfree.chart.encoders.SunPNGEncoderAdapter");
            encoders.put("png",
                    "org.jfree.chart.encoders.SunPNGEncoderAdapter");
            encoders.put("jpeg",
                    "org.jfree.chart.encoders.SunJPEGEncoderAdapter");
        }
        catch (ClassNotFoundException e) {
            encoders.put("png",
                    "org.jfree.chart.encoders.KeypointPNGEncoderAdapter");
        }
    }

    /**
     * Used to set additional encoders or replace default ones.
     *
     * @param format  The image format name.
     * @param imageEncoderClassName  The name of the ImageEncoder class.
     */
    public static void setImageEncoder(String format,
                                       String imageEncoderClassName) {
        encoders.put(format, imageEncoderClassName);
    }

    /**
     * Used to retrieve an ImageEncoder for a specific image format.
     *
     * @param format  The image format required.
     *
     * @return The ImageEncoder or <code>null if none available.
     */
    public static ImageEncoder newInstance(String format) {
        ImageEncoder imageEncoder = null;
        String className = (String) encoders.get(format);
        if (className == null) {
            throw new IllegalArgumentException("Unsupported image format - "
                    + format);
        }
        try {
            Class imageEncoderClass = Class.forName(className);
            imageEncoder = (ImageEncoder) imageEncoderClass.newInstance();
        }
        catch (Exception e) {
            throw new IllegalArgumentException(e.toString());
        }
        return imageEncoder;
    }

    /**
     * Used to retrieve an ImageEncoder for a specific image format.
     *
     * @param format  The image format required.
     * @param quality  The quality to be set before returning.
     *
     * @return The ImageEncoder or <code>null if none available.
     */
    public static ImageEncoder newInstance(String format, float quality) {
        ImageEncoder imageEncoder = newInstance(format);
        imageEncoder.setQuality(quality);
        return imageEncoder;
    }

    /**
     * Used to retrieve an ImageEncoder for a specific image format.
     *
     * @param format  The image format required.
     * @param encodingAlpha  Sets whether alpha transparency should be encoded.
     *
     * @return The ImageEncoder or <code>null if none available.
     */
    public static ImageEncoder newInstance(String format,
                                           boolean encodingAlpha) {
        ImageEncoder imageEncoder = newInstance(format);
        imageEncoder.setEncodingAlpha(encodingAlpha);
        return imageEncoder;
    }

    /**
     * Used to retrieve an ImageEncoder for a specific image format.
     *
     * @param format  The image format required.
     * @param quality  The quality to be set before returning.
     * @param encodingAlpha  Sets whether alpha transparency should be encoded.
     *
     * @return The ImageEncoder or <code>null if none available.
     */
    public static ImageEncoder newInstance(String format, float quality,
                                           boolean encodingAlpha) {
        ImageEncoder imageEncoder = newInstance(format);
        imageEncoder.setQuality(quality);
        imageEncoder.setEncodingAlpha(encodingAlpha);
        return imageEncoder;
    }

}

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