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 * RenderingHintValueReadHandler.java
029 * ----------------------------------
030 * (C)opyright 2003, by Thomas Morgner and Contributors.
031 *
032 * Original Author:  Thomas Morgner;
033 * Contributor(s):   David Gilbert (for Object Refinery Limited);
034 *
035 * $Id: RenderingHintValueReadHandler.java,v 1.3 2005/10/18 13:33:32 mungady Exp $
036 *
037 * Changes 
038 * -------
039 * 03-Dec-2003 : Initial version
040 * 11-Feb-2004 : Added missing Javadocs (DG);
041 * 
042 */
043
044package org.jfree.xml.parser.coretypes;
045
046import java.awt.RenderingHints;
047import java.lang.reflect.Field;
048import java.lang.reflect.Modifier;
049
050import org.jfree.util.Log;
051import org.jfree.xml.parser.AbstractXmlReadHandler;
052import org.jfree.xml.parser.XmlReaderException;
053import org.xml.sax.Attributes;
054import org.xml.sax.SAXException;
055
056/**
057 * A read handler for a rendering hint value.
058 */
059public class RenderingHintValueReadHandler extends AbstractXmlReadHandler {
060
061    /** The key under construction. */
062    private Object key;
063    
064    /** The value under construction. */
065    private Object value;
066
067    /**
068     * Creates a new read handler.
069     */
070    public RenderingHintValueReadHandler() {
071        super();
072    }
073
074    /**
075     * Starts parsing.
076     *
077     * @param attrs  the attributes.
078     *
079     * @throws SAXException if there is a parsing error.
080     */
081    protected void startParsing(final Attributes attrs) throws SAXException {
082        final String keyText = attrs.getValue("key");
083        final String valueText = attrs.getValue("value");
084        this.key = stringToHintField(keyText);
085        this.value = stringToHintField(valueText);
086    }
087
088    private Object stringToHintField (final String name) {
089        final Field[] fields = RenderingHints.class.getFields();
090        for (int i = 0; i < fields.length; i++) {
091            final Field f = fields[i];
092            if (Modifier.isFinal(f.getModifiers()) 
093                && Modifier.isPublic(f.getModifiers()) 
094                && Modifier.isStatic(f.getModifiers())) {
095                try {
096                    final String fieldName = f.getName();
097                    if (fieldName.equals(name)) {
098                        return f.get(null);
099                    }
100                }
101                catch (Exception e) {
102                    Log.info ("Unable to write RenderingHint", e);
103                }
104            }
105        }
106        throw new IllegalArgumentException("Invalid value given");
107    }
108
109    /**
110     * Returns the object for this element.
111     *
112     * @return the object.
113     *
114     * @throws XmlReaderException if there is a parsing error.
115     */
116    public Object getObject() throws XmlReaderException {
117        return new Object[] {this.key, this.value};
118    }
119
120    /**
121     * Returns the key.
122     * 
123     * @return the key.
124     */
125    public Object getKey() {
126        return this.key;
127    }
128
129    /**
130     * Returns the value.
131     * 
132     * @return the value.
133     */
134    public Object getValue() {
135        return this.value;
136    }
137    
138}