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 * SunPNGEncoderAdapter.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
042 package org.jfree.chart.encoders;
043
044 import java.awt.image.BufferedImage;
045 import java.io.ByteArrayOutputStream;
046 import java.io.IOException;
047 import java.io.OutputStream;
048
049 import javax.imageio.ImageIO;
050
051 /**
052 * Adapter class for the Sun PNG Encoder. The ImageEncoderFactory will only
053 * return a reference to this class by default if the library has been compiled
054 * under a JDK 1.4+ and is being run using a JDK 1.4+.
055 */
056 public class SunPNGEncoderAdapter implements ImageEncoder {
057
058 /**
059 * Get the quality of the image encoding (always 0.0).
060 *
061 * @return A float representing the quality.
062 */
063 public float getQuality() {
064 return 0.0f;
065 }
066
067 /**
068 * Set the quality of the image encoding (not supported in this
069 * ImageEncoder).
070 *
071 * @param quality A float representing the quality.
072 */
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 public boolean isEncodingAlpha() {
083 return false;
084 }
085
086 /**
087 * Set whether the encoder should encode alpha transparency (not
088 * supported in this ImageEncoder).
089 *
090 * @param encodingAlpha Whether the encoder should encode alpha
091 * transparency.
092 */
093 public void setEncodingAlpha(boolean encodingAlpha) {
094 // No op
095 }
096
097 /**
098 * Encodes an image in PNG format.
099 *
100 * @param bufferedImage The image to be encoded.
101 *
102 * @return The byte[] that is the encoded image.
103 *
104 * @throws IOException
105 */
106 public byte[] encode(BufferedImage bufferedImage) throws IOException {
107 ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
108 encode(bufferedImage, outputStream);
109 return outputStream.toByteArray();
110 }
111
112 /**
113 * Encodes an image in PNG format and writes it to an OutputStream.
114 *
115 * @param bufferedImage The image to be encoded.
116 * @param outputStream The OutputStream to write the encoded image to.
117 * @throws IOException
118 */
119 public void encode(BufferedImage bufferedImage, OutputStream outputStream)
120 throws IOException {
121 if (bufferedImage == null) {
122 throw new IllegalArgumentException("Null 'image' argument.");
123 }
124 if (outputStream == null) {
125 throw new IllegalArgumentException("Null 'outputStream' argument.");
126 }
127 ImageIO.write(bufferedImage, ImageFormat.PNG, outputStream);
128 }
129
130 }