001    /* ===========================================================
002     * JFreeChart : a free chart library for the Java(tm) platform
003     * ===========================================================
004     *
005     * (C) Copyright 2000-2007, 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     * SunPNGEncoderAdapter.java
029     * -------------------------
030     * (C) Copyright 2004, 2007, by Richard Atkinson and Contributors.
031     *
032     * Original Author:  Richard Atkinson;
033     * Contributor(s):   -;
034     *
035     * $Id: SunPNGEncoderAdapter.java,v 1.3.2.3 2007/02/02 14:51:22 mungady Exp $
036     *
037     * Changes
038     * -------
039     * 01-Aug-2004 : Initial version (RA);
040     * 02-Feb-2007 : Removed author tags all over JFreeChart sources (DG);
041     *
042     */
043    
044    package org.jfree.chart.encoders;
045    
046    import javax.imageio.ImageIO;
047    import java.awt.image.BufferedImage;
048    import java.io.OutputStream;
049    import java.io.ByteArrayOutputStream;
050    import java.io.IOException;
051    
052    /**
053     * Adapter class for the Sun PNG Encoder.  The ImageEncoderFactory will only 
054     * return a reference to this class by default if the library has been compiled 
055     * under a JDK 1.4+ and is being run using a JDK 1.4+.
056     */
057    public class SunPNGEncoderAdapter implements ImageEncoder {
058    
059        /**
060         * Get the quality of the image encoding (always 0.0).
061         *
062         * @return A float representing the quality.
063         */
064        public float getQuality() {
065            return 0.0f;
066        }
067    
068        /**
069         * Set the quality of the image encoding (not supported in this 
070         * ImageEncoder).
071         *
072         * @param quality  A float representing the quality.
073         */
074        public void setQuality(float quality) {
075            //  No op
076        }
077    
078        /**
079         * Get whether the encoder should encode alpha transparency (always false).
080         *
081         * @return Whether the encoder is encoding alpha transparency.
082         */
083        public boolean isEncodingAlpha() {
084            return false;
085        }
086    
087        /**
088         * Set whether the encoder should encode alpha transparency (not 
089         * supported in this ImageEncoder).
090         *
091         * @param encodingAlpha  Whether the encoder should encode alpha 
092         *                       transparency.
093         */
094        public void setEncodingAlpha(boolean encodingAlpha) {
095            //  No op
096        }
097    
098        /**
099         * Encodes an image in PNG format.
100         *
101         * @param bufferedImage  The image to be encoded.
102         * 
103         * @return The byte[] that is the encoded image.
104         * 
105         * @throws IOException
106         */
107        public byte[] encode(BufferedImage bufferedImage) throws IOException {
108            ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
109            encode(bufferedImage, outputStream);
110            return outputStream.toByteArray();
111        }
112    
113        /**
114         * Encodes an image in PNG format and writes it to an OutputStream.
115         *
116         * @param bufferedImage  The image to be encoded.
117         * @param outputStream  The OutputStream to write the encoded image to.
118         * @throws IOException
119         */
120        public void encode(BufferedImage bufferedImage, OutputStream outputStream) 
121            throws IOException {
122            if (bufferedImage == null) {
123                throw new IllegalArgumentException("Null 'image' argument.");
124            }
125            if (outputStream == null) {
126                throw new IllegalArgumentException("Null 'outputStream' argument.");
127            }
128            ImageIO.write(bufferedImage, ImageFormat.PNG, outputStream);
129        }
130    
131    }