/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2008, by Object Refinery Limited and Contributors. 
 *
 * Project Info:  http://www.jfree.org/jfreechart/index.html
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or
 * (at your option) any later version. 
 *
 * This library is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
 * License for more details. 
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
 * USA. 
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
 * in the United States and other countries.] 
 *
 * -------------------------
 * SunPNGEncoderAdapter.java
 * -------------------------
 * (C) Copyright 2004-2008, by Richard Atkinson and Contributors. 
 *
 * Original Author:  Richard Atkinson;
 * Contributor(s):   -;
 *
 * Changes
 * -------
 * 01-Aug-2004 : Initial version (RA);
 * 02-Feb-2007 : Removed author tags all over JFreeChart sources (DG);
 *
 */

package org.jfree.chart.encoders;

import java.awt.image. BufferedImage;
import java.io. ByteArrayOutputStream;
import java.io. IOException;
import java.io. OutputStream;

import javax.imageio. ImageIO;

/**
 * Adapter class for the Sun PNG Encoder.   The ImageEncoderFactory will only
 * return a reference to this class by default if the library has been compiled
 * under a JDK 1.4+ and is being run using a JDK 1.4+. 
 */
public class SunPNGEncoderAdapter implements ImageEncoder {

    /**
     * Get the quality of the image encoding (always 0.0). 
     *
     * @return A float representing the quality. 
     */
    public float getQuality() {
        return 0.0f;
    }

    /**
     * Set the quality of the image encoding (not supported in this
     * ImageEncoder). 
     *
     * @param quality  A float representing the quality. 
     */
    public void setQuality(float quality) {
        //  No op
    }

    /**
     * Get whether the encoder should encode alpha transparency (always false). 
     *
     * @return Whether the encoder is encoding alpha transparency. 
     */
    public boolean isEncodingAlpha() {
        return false;
    }

    /**
     * Set whether the encoder should encode alpha transparency (not
     * supported in this ImageEncoder). 
     *
     * @param encodingAlpha  Whether the encoder should encode alpha
     *                       transparency. 
     */
    public void setEncodingAlpha(boolean encodingAlpha) {
        //  No op
    }

    /**
     * Encodes an image in PNG format. 
     *
     * @param bufferedImage  The image to be encoded. 
     *
     * @return The byte[] that is the encoded image. 
     *
     * @throws IOException
     */
    public byte[] encode(BufferedImage bufferedImage) throws IOException {
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        encode(bufferedImage, outputStream);
        return outputStream.toByteArray();
    }

    /**
     * Encodes an image in PNG format and writes it to an OutputStream. 
     *
     * @param bufferedImage  The image to be encoded. 
     * @param outputStream  The OutputStream to write the encoded image to. 
     * @throws IOException
     */
    public void encode(BufferedImage bufferedImage, OutputStream outputStream)
        throws IOException {
        if (bufferedImage == null) {
            throw new IllegalArgumentException("Null 'image' argument."); 
        }
        if (outputStream == null) {
            throw new IllegalArgumentException("Null 'outputStream' argument."); 
        }
        ImageIO.write(bufferedImage, ImageFormat. PNG, outputStream);
    }

}
