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Java > Open Source Codes > org > jfree > xml > writer > coretypes > ColorWriteHandler


1 /* ========================================================================
2  * JCommon : a free general purpose class library for the Java(tm) platform
3  * ========================================================================
4  *
5  * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
6  *
7  * Project Info: http://www.jfree.org/jcommon/index.html
8  *
9  * This library is free software; you can redistribute it and/or modify it
10  * under the terms of the GNU Lesser General Public License as published by
11  * the Free Software Foundation; either version 2.1 of the License, or
12  * (at your option) any later version.
13  *
14  * This library is distributed in the hope that it will be useful, but
15  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
16  * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
17  * License for more details.
18  *
19  * You should have received a copy of the GNU Lesser General Public
20  * License along with this library; if not, write to the Free Software
21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
22  * USA.
23  *
24  * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
25  * in the United States and other countries.]
26  *
27  * ----------------------
28  * ColorWriteHandler.java
29  * ----------------------
30  * (C) Copyright 2003-2005, by Object Refinery Limited and Contributors.
31  *
32  * Original Author: Thomas Morgner;
33  * Contributor(s): David Gilbert (for Object Refinery Limited);
34  *
35  * $Id: ColorWriteHandler.java,v 1.3 2005/10/18 13:35:21 mungady Exp $
36  *
37  * Changes (from 23-Dec-2003)
38  * --------------------------
39  * 23-Dec-2003 : Added standard header and Javadocs (DG);
40  *
41  */
42
43 package org.jfree.xml.writer.coretypes;
44
45 import java.awt.Color JavaDoc;
46 import java.io.IOException JavaDoc;
47
48 import org.jfree.xml.writer.AbstractXmlWriteHandler;
49 import org.jfree.xml.writer.AttributeList;
50 import org.jfree.xml.writer.XMLWriter;
51 import org.jfree.xml.writer.XMLWriterException;
52
53 /**
54  * A handler for writing a {@link Color} object.
55  */
56 public class ColorWriteHandler extends AbstractXmlWriteHandler {
57
58     /**
59      * Default constructor.
60      */
61     public ColorWriteHandler() {
62         super();
63     }
64
65     /**
66      * Performs the writing of a {@link Color} object.
67      *
68      * @param tagName the tag name.
69      * @param object the {@link Color} object.
70      * @param writer the writer.
71      * @param mPlexAttribute ??.
72      * @param mPlexValue ??.
73      *
74      * @throws IOException if there is an I/O error.
75      * @throws XMLWriterException if there is a writer error.
76      */
77     public void write(final String JavaDoc tagName, final Object JavaDoc object, final XMLWriter writer,
78                       final String JavaDoc mPlexAttribute, final String JavaDoc mPlexValue)
79         throws IOException JavaDoc, XMLWriterException {
80         final Color JavaDoc color = (Color JavaDoc) object;
81         final AttributeList attribs = new AttributeList();
82         if (mPlexAttribute != null) {
83             attribs.setAttribute(mPlexAttribute, mPlexValue);
84         }
85         attribs.setAttribute("value", encodeColor(color));
86         if (color.getAlpha() != 255) {
87             attribs.setAttribute("alpha", String.valueOf(color.getAlpha()));
88         }
89         writer.writeTag(tagName, attribs, true);
90     }
91
92     private String JavaDoc encodeColor(final Color JavaDoc color) {
93         return "#" + encodeInt(color.getRed())
94             + encodeInt(color.getGreen()) + encodeInt(color.getBlue());
95     }
96
97     private String JavaDoc encodeInt(final int i) {
98         final String JavaDoc retVal = Integer.toHexString(i);
99         if (retVal.length() == 1) {
100             return "0" + retVal;
101         }
102         else {
103             return retVal;
104         }
105     }
106 }
107
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