001 /* ===========================================================
002 * JFreeChart : a free chart library for the Java(tm) platform
003 * ===========================================================
004 *
005 * (C) Copyright 2000-2007, 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, 2007, by Richard Atkinson and Contributors.
031 *
032 * Original Author: Richard Atkinson;
033 * Contributor(s): -;
034 *
035 * $Id: SunPNGEncoderAdapter.java,v 1.3.2.4 2007/04/17 11:01:42 mungady Exp $
036 *
037 * Changes
038 * -------
039 * 01-Aug-2004 : Initial version (RA);
040 * 02-Feb-2007 : Removed author tags all over JFreeChart sources (DG);
041 *
042 */
043
044 package org.jfree.chart.encoders;
045
046 import java.awt.image.BufferedImage;
047 import java.io.ByteArrayOutputStream;
048 import java.io.IOException;
049 import java.io.OutputStream;
050
051 import javax.imageio.ImageIO;
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 */
058 public 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 public float getQuality() {
066 return 0.0f;
067 }
068
069 /**
070 * Set the quality of the image encoding (not supported in this
071 * ImageEncoder).
072 *
073 * @param quality A float representing the quality.
074 */
075 public void setQuality(float quality) {
076 // No op
077 }
078
079 /**
080 * Get whether the encoder should encode alpha transparency (always false).
081 *
082 * @return Whether the encoder is encoding alpha transparency.
083 */
084 public boolean isEncodingAlpha() {
085 return false;
086 }
087
088 /**
089 * Set whether the encoder should encode alpha transparency (not
090 * supported in this ImageEncoder).
091 *
092 * @param encodingAlpha Whether the encoder should encode alpha
093 * transparency.
094 */
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 public byte[] encode(BufferedImage bufferedImage) throws IOException {
109 ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
110 encode(bufferedImage, outputStream);
111 return outputStream.toByteArray();
112 }
113
114 /**
115 * Encodes an image in PNG format and writes it to an OutputStream.
116 *
117 * @param bufferedImage The image to be encoded.
118 * @param outputStream The OutputStream to write the encoded image to.
119 * @throws IOException
120 */
121 public void encode(BufferedImage bufferedImage, OutputStream outputStream)
122 throws IOException {
123 if (bufferedImage == null) {
124 throw new IllegalArgumentException("Null 'image' argument.");
125 }
126 if (outputStream == null) {
127 throw new IllegalArgumentException("Null 'outputStream' argument.");
128 }
129 ImageIO.write(bufferedImage, ImageFormat.PNG, outputStream);
130 }
131
132 }