001/* ===========================================================
002 * JFreeChart : a free chart library for the Java(tm) platform
003 * ===========================================================
004 *
005 * (C) Copyright 2000-2008, 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 2004-2008, by Richard Atkinson and Contributors.
031 *
032 * Original Author:  Richard Atkinson;
033 * Contributor(s):   -;
034 *
035 * Changes
036 * -------
037 * 01-Aug-2004 : Initial version (RA);
038 * 02-Feb-2007 : Removed author tags all over JFreeChart sources (DG);
039 *
040 */
041
042package org.jfree.chart.encoders;
043
044import java.awt.image.BufferedImage;
045import java.io.ByteArrayOutputStream;
046import java.io.IOException;
047import java.io.OutputStream;
048
049import javax.imageio.ImageIO;
050
051/**
052 * Adapter class for the Sun PNG Encoder.  The ImageEncoderFactory will only
053 * return a reference to this class by default if the library has been compiled
054 * under a JDK 1.4+ and is being run using a JDK 1.4+.
055 */
056public class SunPNGEncoderAdapter implements ImageEncoder {
057
058    /**
059     * Get the quality of the image encoding (always 0.0).
060     *
061     * @return A float representing the quality.
062     */
063    public float getQuality() {
064        return 0.0f;
065    }
066
067    /**
068     * Set the quality of the image encoding (not supported in this
069     * ImageEncoder).
070     *
071     * @param quality  A float representing the quality.
072     */
073    public void setQuality(float quality) {
074        //  No op
075    }
076
077    /**
078     * Get whether the encoder should encode alpha transparency (always false).
079     *
080     * @return Whether the encoder is encoding alpha transparency.
081     */
082    public boolean isEncodingAlpha() {
083        return false;
084    }
085
086    /**
087     * Set whether the encoder should encode alpha transparency (not
088     * supported in this ImageEncoder).
089     *
090     * @param encodingAlpha  Whether the encoder should encode alpha
091     *                       transparency.
092     */
093    public void setEncodingAlpha(boolean encodingAlpha) {
094        //  No op
095    }
096
097    /**
098     * Encodes an image in PNG format.
099     *
100     * @param bufferedImage  The image to be encoded.
101     *
102     * @return The byte[] that is the encoded image.
103     *
104     * @throws IOException
105     */
106    public byte[] encode(BufferedImage bufferedImage) throws IOException {
107        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
108        encode(bufferedImage, outputStream);
109        return outputStream.toByteArray();
110    }
111
112    /**
113     * Encodes an image in PNG format and writes it to an OutputStream.
114     *
115     * @param bufferedImage  The image to be encoded.
116     * @param outputStream  The OutputStream to write the encoded image to.
117     * @throws IOException
118     */
119    public void encode(BufferedImage bufferedImage, OutputStream outputStream)
120        throws IOException {
121        if (bufferedImage == null) {
122            throw new IllegalArgumentException("Null 'image' argument.");
123        }
124        if (outputStream == null) {
125            throw new IllegalArgumentException("Null 'outputStream' argument.");
126        }
127        ImageIO.write(bufferedImage, ImageFormat.PNG, outputStream);
128    }
129
130}