001 /**
002 * ========================================
003 * JFreeReport : a free Java report library
004 * ========================================
005 *
006 * Project Info: http://reporting.pentaho.org/
007 *
008 * (C) Copyright 2000-2007, by Object Refinery Limited, Pentaho Corporation and Contributors.
009 *
010 * This library is free software; you can redistribute it and/or modify it under the terms
011 * of the GNU Lesser General Public License as published by the Free Software Foundation;
012 * either version 2.1 of the License, or (at your option) any later version.
013 *
014 * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
015 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
016 * See the GNU Lesser General Public License for more details.
017 *
018 * You should have received a copy of the GNU Lesser General Public License along with this
019 * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
020 * Boston, MA 02111-1307, USA.
021 *
022 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
023 * in the United States and other countries.]
024 *
025 * ------------
026 * $Id: ColorValueConverter.java,v 1.7 2007/04/01 18:49:34 taqua Exp $
027 * ------------
028 * (C) Copyright 2000-2005, by Object Refinery Limited.
029 * (C) Copyright 2005-2007, by Pentaho Corporation.
030 */
031 package org.jfree.report.util.beans;
032
033 import java.awt.Color;
034 import java.lang.reflect.Field;
035 import java.lang.reflect.Modifier;
036
037 /**
038 * A class that handles the conversion of {@link Integer} attributes to and from their
039 * {@link String} representation.
040 *
041 * @author Thomas Morgner
042 */
043 public class ColorValueConverter implements ValueConverter
044 {
045
046 /**
047 * Creates a new value converter.
048 */
049 public ColorValueConverter ()
050 {
051 super();
052 }
053
054 /**
055 * Converts the attribute to a string.
056 *
057 * @param o the attribute ({@link Integer} expected).
058 * @return A string representing the {@link Integer} value.
059 */
060 public String toAttributeValue (final Object o)
061 {
062 if (!(o instanceof Color))
063 {
064 throw new ClassCastException("Is no instance of java.awt.Color");
065 }
066 final Color c = (Color) o;
067
068 try
069 {
070 final Field[] fields = Color.class.getFields();
071 for (int i = 0; i < fields.length; i++)
072 {
073 final Field f = fields[i];
074 if (Modifier.isPublic(f.getModifiers())
075 && Modifier.isFinal(f.getModifiers())
076 && Modifier.isStatic(f.getModifiers()))
077 {
078 final String name = f.getName();
079 final Object oColor = f.get(null);
080 if (oColor instanceof Color)
081 {
082 if (c.equals(oColor))
083 {
084 return name;
085 }
086 }
087 }
088 }
089 }
090 catch (Exception e)
091 {
092 //
093 }
094
095 // no defined constant color, so this must be a user defined color
096 final String color = Integer.toHexString(c.getRGB() & 0x00ffffff);
097 final StringBuffer retval = new StringBuffer(7);
098 retval.append("#");
099
100 final int fillUp = 6 - color.length();
101 for (int i = 0; i < fillUp; i++)
102 {
103 retval.append("0");
104 }
105
106 retval.append(color);
107 return retval.toString();
108 }
109
110 /**
111 * Converts a string to a {@link Integer}.
112 *
113 * @param value the string.
114 * @return a {@link Integer}.
115 */
116 public Object toPropertyValue (final String value)
117 {
118 if (value == null)
119 {
120 return Color.black;
121 }
122 try
123 {
124 // get color by hex or octal value
125 return Color.decode(value);
126 }
127 catch (NumberFormatException nfe)
128 {
129 // if we can't decode lets try to get it by name
130 try
131 {
132 // try to get a color by name using reflection
133 final Field f = Color.class.getField(value);
134
135 return (Color) f.get(null);
136 }
137 catch (Exception ce)
138 {
139 throw new IllegalArgumentException
140 ("The color string '" + value + "' is not recognized.");
141 }
142 }
143 }
144 }