001/* ===========================================================
002 * JFreeChart : a free chart library for the Java(tm) platform
003 * ===========================================================
004 *
005 * (C) Copyright 2000-2014, 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 2004-2014, 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 * 02-Jul-2013 : Use ParamChecks (DG);
040 *
041 */
042
043package org.jfree.chart.encoders;
044
045import java.awt.image.BufferedImage;
046import java.io.ByteArrayOutputStream;
047import java.io.IOException;
048import java.io.OutputStream;
049
050import javax.imageio.ImageIO;
051import org.jfree.chart.util.ParamChecks;
052
053/**
054 * Adapter class for the Sun PNG Encoder.  The ImageEncoderFactory will only
055 * return a reference to this class by default if the library has been compiled
056 * under a JDK 1.4+ and is being run using a JDK 1.4+.
057 */
058public class SunPNGEncoderAdapter implements ImageEncoder {
059
060    /**
061     * Get the quality of the image encoding (always 0.0).
062     *
063     * @return A float representing the quality.
064     */
065    @Override
066    public float getQuality() {
067        return 0.0f;
068    }
069
070    /**
071     * Set the quality of the image encoding (not supported in this
072     * ImageEncoder).
073     *
074     * @param quality  A float representing the quality.
075     */
076    @Override
077    public void setQuality(float quality) {
078        //  No op
079    }
080
081    /**
082     * Get whether the encoder should encode alpha transparency (always false).
083     *
084     * @return Whether the encoder is encoding alpha transparency.
085     */
086    @Override
087    public boolean isEncodingAlpha() {
088        return false;
089    }
090
091    /**
092     * Set whether the encoder should encode alpha transparency (not
093     * supported in this ImageEncoder).
094     *
095     * @param encodingAlpha  Whether the encoder should encode alpha
096     *                       transparency.
097     */
098    @Override
099    public void setEncodingAlpha(boolean encodingAlpha) {
100        //  No op
101    }
102
103    /**
104     * Encodes an image in PNG format.
105     *
106     * @param bufferedImage  The image to be encoded.
107     *
108     * @return The byte[] that is the encoded image.
109     *
110     * @throws IOException if there is an IO problem.
111     */
112    @Override
113    public byte[] encode(BufferedImage bufferedImage) throws IOException {
114        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
115        encode(bufferedImage, outputStream);
116        return outputStream.toByteArray();
117    }
118
119    /**
120     * Encodes an image in PNG format and writes it to an OutputStream.
121     *
122     * @param bufferedImage  The image to be encoded.
123     * @param outputStream  The OutputStream to write the encoded image to.
124     * @throws IOException if there is an IO problem.
125     */
126    @Override
127    public void encode(BufferedImage bufferedImage, OutputStream outputStream)
128            throws IOException {
129        ParamChecks.nullNotPermitted(bufferedImage, "bufferedImage");
130        ParamChecks.nullNotPermitted(outputStream, "outputStream");
131        ImageIO.write(bufferedImage, ImageFormat.PNG, outputStream);
132    }
133
134}