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 * RenderingHintsHandler.java
029 * --------------------------
030 * (C)opyright 2003-2005, by Thomas Morgner and Contributors.
031 *
032 * Original Author:  Thomas Morgner;
033 * Contributor(s):   David Gilbert (for Object Refinery Limited);
034 *
035 * $Id: RenderingHintsWriteHandler.java,v 1.5 2005/10/18 13:35:21 mungady Exp $
036 *
037 * Changes 
038 * -------------------------
039 * 22.11.2003 : Initial version
040 *  
041 */
042
043package org.jfree.xml.writer.coretypes;
044
045import java.awt.RenderingHints;
046import java.io.IOException;
047import java.lang.reflect.Field;
048import java.lang.reflect.Modifier;
049import java.util.Iterator;
050
051import org.jfree.util.Log;
052import org.jfree.xml.writer.AbstractXmlWriteHandler;
053import org.jfree.xml.writer.AttributeList;
054import org.jfree.xml.writer.XMLWriter;
055import org.jfree.xml.writer.XMLWriterException;
056import org.jfree.xml.writer.XMLWriterSupport;
057
058/**
059 * A handler for writing a {@link RenderingHints} object.
060 */
061public class RenderingHintsWriteHandler extends AbstractXmlWriteHandler {
062
063    /**
064     * Default constructor.
065     */
066    public RenderingHintsWriteHandler() {
067        super();
068    }
069
070    /**
071     * Performs the writing of a single object.
072     *
073     * @param tagName  the tag name.
074     * @param object  the object.
075     * @param writer  the writer.
076     * @param mPlexAttribute  ??.
077     * @param mPlexValue  ??.
078     * 
079     * @throws IOException if there is an I/O error.
080     * @throws XMLWriterException if there is a writer problem.
081     */
082    public void write(final String tagName, final Object object, final XMLWriter writer,
083                      final String mPlexAttribute, final String mPlexValue)
084        throws IOException, XMLWriterException {
085
086        writer.writeTag(tagName, mPlexAttribute, mPlexValue, XMLWriterSupport.OPEN);
087        writer.allowLineBreak();
088        final RenderingHints hints = (RenderingHints) object;
089        final Iterator it = hints.keySet().iterator();
090        while (it.hasNext()) {
091            final RenderingHints.Key key = (RenderingHints.Key) it.next();
092            final String keyname = hintFieldToString(key);
093            final String value = hintFieldToString(hints.get(key));
094            final AttributeList attribs = new AttributeList();
095            attribs.setAttribute("key", keyname);
096            attribs.setAttribute("value", value);
097            writer.writeTag("entry", attribs, XMLWriterSupport.CLOSE);
098            writer.allowLineBreak();
099        }
100        writer.writeCloseTag(tagName);
101        writer.allowLineBreak();
102    }
103
104    private String hintFieldToString(final Object o) {
105        final Field[] fields = RenderingHints.class.getFields();
106        for (int i = 0; i < fields.length; i++) {
107            final Field f = fields[i];
108            if (Modifier.isFinal(f.getModifiers()) 
109                && Modifier.isPublic(f.getModifiers()) 
110                && Modifier.isStatic(f.getModifiers())) {
111                try {
112                    final Object value = f.get(null);
113                    if (o.equals(value)) {
114                        return f.getName();
115                    }
116                }
117                catch (Exception e) {
118                    Log.info ("Unable to write RenderingHint", e);
119                }
120            }
121        }
122        throw new IllegalArgumentException("Invalid value given");
123    }
124
125}