001    /* ===========================================================
002     * JFreeChart : a free chart library for the Java(tm) platform
003     * ===========================================================
004     *
005     * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
006     *
007     * Project Info:  http://www.jfree.org/jfreechart/index.html
008     *
009     * This library is free software; you can redistribute it and/or modify it 
010     * under the terms of the GNU Lesser General Public License as published by 
011     * the Free Software Foundation; either version 2.1 of the License, or 
012     * (at your option) any later version.
013     *
014     * This library is distributed in the hope that it will be useful, but 
015     * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 
016     * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 
017     * License for more details.
018     *
019     * You should have received a copy of the GNU Lesser General Public
020     * License along with this library; if not, write to the Free Software
021     * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, 
022     * USA.  
023     *
024     * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
025     * in the United States and other countries.]
026     *
027     * --------------------------
028     * SunJPEGEncoderAdapter.java
029     * --------------------------
030     * (C) Copyright 2004, 2005, by Richard Atkinson and Contributors.
031     *
032     * Original Author:  Richard Atkinson;
033     * Contributor(s):   David Gilbert (for Object Refinery Limited);
034     *
035     * $Id: SunJPEGEncoderAdapter.java,v 1.3.2.2 2005/11/01 16:37:01 mungady Exp $
036     *
037     * Changes
038     * -------
039     * 01-Aug-2004 : Initial version (RA);
040     * 01-Nov-2005 : To remove the dependency on non-supported APIs, use ImageIO 
041     *               instead of com.sun.image.codec.jpeg.JPEGImageEncoder - this 
042     *               adapter will only be available on JDK 1.4 or later (DG);
043     *
044     */
045    
046    package org.jfree.chart.encoders;
047    
048    import java.awt.image.BufferedImage;
049    import java.io.ByteArrayOutputStream;
050    import java.io.IOException;
051    import java.io.OutputStream;
052    
053    import javax.imageio.ImageIO;
054    
055    /**
056     * Adapter class for the Sun JPEG Encoder.  The ImageEncoderFactory will only 
057     * return a reference to this class by default if the library has been compiled 
058     * under a JDK 1.4+ and is being run using a JDK 1.4+.
059     *
060     * @author Richard Atkinson
061     */
062    public class SunJPEGEncoderAdapter implements ImageEncoder {
063        
064        private float quality = 0.75f;
065    
066        /**
067         * Default constructor.
068         */
069        public SunJPEGEncoderAdapter() {
070        }
071    
072        /**
073         * Get the quality of the image encoding.
074         *
075         * @return A float representing the quality.
076         */
077        public float getQuality() {
078            return this.quality;
079        }
080    
081        /**
082         * Set the quality of the image encoding (ignored).
083         *
084         * @param quality  A float representing the quality.
085         */
086        public void setQuality(float quality) {
087            this.quality = quality;
088        }
089    
090        /**
091         * Get whether the encoder encodes alpha transparency (always false).
092         *
093         * @return Whether the encoder is encoding alpha transparency.
094         */
095        public boolean isEncodingAlpha() {
096            return false;
097        }
098    
099        /**
100         * Set whether the encoder should encode alpha transparency (not supported 
101         * for JPEG).
102         *
103         * @param encodingAlpha  Whether the encoder should encode alpha 
104         *                       transparency.
105         */
106        public void setEncodingAlpha(boolean encodingAlpha) {
107            //  No op
108        }
109    
110        /**
111         * Encodes an image in JPEG format.
112         *
113         * @param bufferedImage  The image to be encoded.
114         * 
115         * @return The byte[] that is the encoded image.
116         * 
117         * @throws IOException
118         */
119        public byte[] encode(BufferedImage bufferedImage) throws IOException {
120            ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
121            encode(bufferedImage, outputStream);
122            return outputStream.toByteArray();
123        }
124    
125        /**
126         * Encodes an image in JPEG format and writes it to an OutputStream.
127         *
128         * @param bufferedImage  The image to be encoded.
129         * @param outputStream  The OutputStream to write the encoded image to.
130         * @throws IOException
131         */
132        public void encode(BufferedImage bufferedImage, OutputStream outputStream) 
133            throws IOException {
134            if (bufferedImage == null) {
135                throw new IllegalArgumentException("Null 'image' argument.");
136            }
137            if (outputStream == null) {
138                throw new IllegalArgumentException("Null 'outputStream' argument.");
139            }
140            ImageIO.write(bufferedImage, ImageFormat.JPEG, outputStream);
141        }
142    
143    }