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jfreechart example source code file (SunJPEGEncoderAdapter.java)

This example jfreechart source code file (SunJPEGEncoderAdapter.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

awt, bytearrayoutputstream, bytearrayoutputstream, illegalargumentexception, illegalargumentexception, image, imageencoder, imageio, imageoutputstream, imagewriter, io, ioexception, ioexception, iterator, null, outputstream, sunjpegencoderadapter, sunjpegencoderadapter, util

The jfreechart SunJPEGEncoderAdapter.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.]
 *
 * --------------------------
 * SunJPEGEncoderAdapter.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 : To remove the dependency on non-supported APIs, use ImageIO
 *               instead of com.sun.image.codec.jpeg.JPEGImageEncoder - this
 *               adapter will only be available on JDK 1.4 or later (DG);
 * ------------- JFREECHART 1.0.x ---------------------------------------------
 * 20-Jul-2006 : Pass quality setting to ImageIO. Also increased default
 *               value to 0.95 (DG);
 *
 */

package org.jfree.chart.encoders;

import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Iterator;

import javax.imageio.IIOImage;
import javax.imageio.ImageIO;
import javax.imageio.ImageWriteParam;
import javax.imageio.ImageWriter;
import javax.imageio.stream.ImageOutputStream;

/**
 * Adapter class for the Sun JPEG Encoder.  The {@link ImageEncoderFactory}
 * will only return a reference to this class by default if the library has
 * been compiled under a JDK 1.4+ and is being run using a JRE 1.4+.
 */
public class SunJPEGEncoderAdapter implements ImageEncoder {

    /** The quality setting (in the range 0.0f to 1.0f). */
    private float quality = 0.95f;

    /**
     * Creates a new <code>SunJPEGEncoderAdapter instance.
     */
    public SunJPEGEncoderAdapter() {
    }

    /**
     * Returns the quality of the image encoding, which is a number in the
     * range 0.0f to 1.0f (higher values give better quality output, but larger
     * file sizes).  The default value is 0.95f.
     *
     * @return A float representing the quality, in the range 0.0f to 1.0f.
     *
     * @see #setQuality(float)
     */
    public float getQuality() {
        return this.quality;
    }

    /**
     * Set the quality of the image encoding.
     *
     * @param quality  A float representing the quality (in the range 0.0f to
     *     1.0f).
     *
     * @see #getQuality()
     */
    public void setQuality(float quality) {
        if (quality < 0.0f || quality > 1.0f) {
            throw new IllegalArgumentException(
                    "The 'quality' must be in the range 0.0f to 1.0f");
        }
        this.quality = quality;
    }

    /**
     * Returns <code>false always, indicating that this encoder does not
     * encode alpha transparency.
     *
     * @return <code>false.
     */
    public boolean isEncodingAlpha() {
        return false;
    }

    /**
     * Set whether the encoder should encode alpha transparency (this is not
     * supported for JPEG, so this method does nothing).
     *
     * @param encodingAlpha  ignored.
     */
    public void setEncodingAlpha(boolean encodingAlpha) {
        //  No op
    }

    /**
     * Encodes an image in JPEG format.
     *
     * @param bufferedImage  the image to be encoded (<code>null not
     *     permitted).
     *
     * @return The byte[] that is the encoded image.
     *
     * @throws IOException if there is an I/O problem.
     * @throws NullPointerException if <code>bufferedImage is
     *     <code>null.
     */
    public byte[] encode(BufferedImage bufferedImage) throws IOException {
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        encode(bufferedImage, outputStream);
        return outputStream.toByteArray();
    }

    /**
     * Encodes an image in JPEG format and writes it to an output stream.
     *
     * @param bufferedImage  the image to be encoded (<code>null not
     *     permitted).
     * @param outputStream  the OutputStream to write the encoded image to
     *     (<code>null not permitted).
     *
     * @throws IOException if there is an I/O problem.
     * @throws NullPointerException if <code>bufferedImage is
     *     <code>null.
     */
    public void encode(BufferedImage bufferedImage, OutputStream outputStream)
            throws IOException {
        if (bufferedImage == null) {
            throw new IllegalArgumentException("Null 'image' argument.");
        }
        if (outputStream == null) {
            throw new IllegalArgumentException("Null 'outputStream' argument.");
        }
        Iterator iterator = ImageIO.getImageWritersByFormatName("jpeg");
        ImageWriter writer = (ImageWriter) iterator.next();
        ImageWriteParam p = writer.getDefaultWriteParam();
        p.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
        p.setCompressionQuality(this.quality);
        ImageOutputStream ios = ImageIO.createImageOutputStream(outputStream);
        writer.setOutput(ios);
        writer.write(null, new IIOImage(bufferedImage, null, null), p);
        ios.flush();
        writer.dispose();
        ios.close();
    }

}

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