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)
109: throws IOException {
110: ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
111: encode(bufferedImage, outputStream);
112: return outputStream.toByteArray();
113: }
114:
115: /**
116: * Encodes an image in PNG format and writes it to an OutputStream.
117: *
118: * @param bufferedImage The image to be encoded.
119: * @param outputStream The OutputStream to write the encoded image to.
120: * @throws IOException
121: */
122: public void encode(BufferedImage bufferedImage,
123: OutputStream outputStream) throws IOException {
124: if (bufferedImage == null) {
125: throw new IllegalArgumentException("Null 'image' argument.");
126: }
127: if (outputStream == null) {
128: throw new IllegalArgumentException(
129: "Null 'outputStream' argument.");
130: }
131: ImageIO.write(bufferedImage, ImageFormat.PNG, outputStream);
132: }
133:
134: }
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