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 * PNGEncoderAdapter.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 jahuwaldt.image.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.
053 */
054public class PNGEncoderAdapter implements ImageEncoder {
055
056    /**
057     * Get the quality of the image encoding (always 0.0).
058     *
059     * @return A float representing the quality.
060     */
061    @Override
062    public float getQuality() {
063        return 0.0f;
064    }
065
066    /**
067     * Set the quality of the image encoding (not supported in this
068     * ImageEncoder).
069     *
070     * @param quality  A float representing the quality.
071     */
072    @Override
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    @Override
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    @Override
095    public void setEncodingAlpha(boolean encodingAlpha) {
096        //  No op
097    }
098
099    /**
100     * Encodes an image in PNG format.
101     *
102     * @param bufferedImage  The image to be encoded.
103     *
104     * @return The byte[] that is the encoded image.
105     *
106     * @throws IOException
107     */
108    @Override
109    public byte[] encode(BufferedImage bufferedImage) throws IOException {
110        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
111        encode(bufferedImage, outputStream);
112        return outputStream.toByteArray();
113    }
114
115    /**
116     * Encodes an image in PNG format and writes it to an OutputStream.
117     *
118     * @param bufferedImage  The image to be encoded.
119     * @param outputStream  The OutputStream to write the encoded image to.
120     * @throws IOException
121     */
122    @Override
123    public void encode(BufferedImage bufferedImage, OutputStream outputStream)
124        throws IOException {
125        if (bufferedImage == null) {
126            throw new IllegalArgumentException("Null 'bufferedImage' argument.");
127        }
128        if (outputStream == null) {
129            throw new IllegalArgumentException("Null 'outputStream' argument.");
130        }
131        ImageIO.write(bufferedImage, "png", outputStream);
132    }
133
134}