    001/* ===========================================================
    002 * JFreeChart : a free chart library for the Java(tm) platform
    003 * ===========================================================
    004 *
    005 * (C) Copyright 2000-2011, 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 * [Oracle and Java are registered trademarks of Oracle and/or its affiliates.
    025 * Other names may be trademarks of their respective owners.]
    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}