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 1.3.2.3 2007/02/02 14:51:22 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 javax.imageio.ImageIO;
047 import java.awt.image.BufferedImage;
048 import java.io.OutputStream;
049 import java.io.ByteArrayOutputStream;
050 import java.io.IOException;
051
052 /**
053 * Adapter class for the Sun PNG Encoder. The ImageEncoderFactory will only
054 * return a reference to this class by default if the library has been compiled
055 * under a JDK 1.4+ and is being run using a JDK 1.4+.
056 */
057 public class SunPNGEncoderAdapter implements ImageEncoder {
058
059 /**
060 * Get the quality of the image encoding (always 0.0).
061 *
062 * @return A float representing the quality.
063 */
064 public float getQuality() {
065 return 0.0f;
066 }
067
068 /**
069 * Set the quality of the image encoding (not supported in this
070 * ImageEncoder).
071 *
072 * @param quality A float representing the quality.
073 */
074 public void setQuality(float quality) {
075 // No op
076 }
077
078 /**
079 * Get whether the encoder should encode alpha transparency (always false).
080 *
081 * @return Whether the encoder is encoding alpha transparency.
082 */
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 public void setEncodingAlpha(boolean encodingAlpha) {
095 // No op
096 }
097
098 /**
099 * Encodes an image in PNG format.
100 *
101 * @param bufferedImage The image to be encoded.
102 *
103 * @return The byte[] that is the encoded image.
104 *
105 * @throws IOException
106 */
107 public byte[] encode(BufferedImage bufferedImage) throws IOException {
108 ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
109 encode(bufferedImage, outputStream);
110 return outputStream.toByteArray();
111 }
112
113 /**
114 * Encodes an image in PNG format and writes it to an OutputStream.
115 *
116 * @param bufferedImage The image to be encoded.
117 * @param outputStream The OutputStream to write the encoded image to.
118 * @throws IOException
119 */
120 public void encode(BufferedImage bufferedImage, OutputStream outputStream)
121 throws IOException {
122 if (bufferedImage == null) {
123 throw new IllegalArgumentException("Null 'image' argument.");
124 }
125 if (outputStream == null) {
126 throw new IllegalArgumentException("Null 'outputStream' argument.");
127 }
128 ImageIO.write(bufferedImage, ImageFormat.PNG, outputStream);
129 }
130
131 }