001 /* ========================================================================
002 * JCommon : a free general purpose class library for the Java(tm) platform
003 * ========================================================================
004 *
005 * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
006 *
007 * Project Info: http://www.jfree.org/jcommon/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 * ColorWriteHandler.java
029 * ----------------------
030 * (C) Copyright 2003-2005, by Object Refinery Limited and Contributors.
031 *
032 * Original Author: Thomas Morgner;
033 * Contributor(s): David Gilbert (for Object Refinery Limited);
034 *
035 * $Id: ColorWriteHandler.java,v 1.3 2005/10/18 13:35:21 mungady Exp $
036 *
037 * Changes (from 23-Dec-2003)
038 * --------------------------
039 * 23-Dec-2003 : Added standard header and Javadocs (DG);
040 *
041 */
042
043 package org.jfree.xml.writer.coretypes;
044
045 import java.awt.Color;
046 import java.io.IOException;
047
048 import org.jfree.xml.writer.AbstractXmlWriteHandler;
049 import org.jfree.xml.writer.AttributeList;
050 import org.jfree.xml.writer.XMLWriter;
051 import org.jfree.xml.writer.XMLWriterException;
052
053 /**
054 * A handler for writing a {@link Color} object.
055 */
056 public class ColorWriteHandler extends AbstractXmlWriteHandler {
057
058 /**
059 * Default constructor.
060 */
061 public ColorWriteHandler() {
062 super();
063 }
064
065 /**
066 * Performs the writing of a {@link Color} object.
067 *
068 * @param tagName the tag name.
069 * @param object the {@link Color} object.
070 * @param writer the writer.
071 * @param mPlexAttribute ??.
072 * @param mPlexValue ??.
073 *
074 * @throws IOException if there is an I/O error.
075 * @throws XMLWriterException if there is a writer error.
076 */
077 public void write(final String tagName, final Object object, final XMLWriter writer,
078 final String mPlexAttribute, final String mPlexValue)
079 throws IOException, XMLWriterException {
080 final Color color = (Color) object;
081 final AttributeList attribs = new AttributeList();
082 if (mPlexAttribute != null) {
083 attribs.setAttribute(mPlexAttribute, mPlexValue);
084 }
085 attribs.setAttribute("value", encodeColor(color));
086 if (color.getAlpha() != 255) {
087 attribs.setAttribute("alpha", String.valueOf(color.getAlpha()));
088 }
089 writer.writeTag(tagName, attribs, true);
090 }
091
092 private String encodeColor(final Color color) {
093 return "#" + encodeInt(color.getRed())
094 + encodeInt(color.getGreen()) + encodeInt(color.getBlue());
095 }
096
097 private String encodeInt(final int i) {
098 final String retVal = Integer.toHexString(i);
099 if (retVal.length() == 1) {
100 return "0" + retVal;
101 }
102 else {
103 return retVal;
104 }
105 }
106 }