KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > org > swixml > converters > ColorConverter


1 /*--
2  $Id: ColorConverter.java,v 1.1 2004/03/01 07:55:58 wolfpaulus Exp $
3
4  Copyright (C) 2003-2004 Wolf Paulus.
5  All rights reserved.
6
7  Redistribution and use in source and binary forms, with or without
8  modification, are permitted provided that the following conditions
9  are met:
10
11  1. Redistributions of source code must retain the above copyright
12  notice, this list of conditions, and the following disclaimer.
13
14  2. Redistributions in binary form must reproduce the above copyright
15  notice, this list of conditions, and the disclaimer that follows
16  these conditions in the documentation and/or other materials provided
17  with the distribution.
18
19  3. The end-user documentation included with the redistribution,
20  if any, must include the following acknowledgment:
21         "This product includes software developed by the
22          SWIXML Project (http://www.swixml.org/)."
23  Alternately, this acknowledgment may appear in the software itself,
24  if and wherever such third-party acknowledgments normally appear.
25
26  4. The name "Swixml" must not be used to endorse or promote products
27  derived from this software without prior written permission. For
28  written permission, please contact <info_AT_swixml_DOT_org>
29
30  5. Products derived from this software may not be called "Swixml",
31  nor may "Swixml" appear in their name, without prior written
32  permission from the Swixml Project Management.
33
34  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
35  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
36  OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
37  DISCLAIMED. IN NO EVENT SHALL THE SWIXML PROJECT OR ITS
38  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
39  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
40  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
41  USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
42  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
43  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
44  OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
45  SUCH DAMAGE.
46  ====================================================================
47
48  This software consists of voluntary contributions made by many
49  individuals on behalf of the Swixml Project and was originally
50  created by Wolf Paulus <wolf_AT_swixml_DOT_org>. For more information
51  on the Swixml Project, please see <http://www.swixml.org/>.
52 */
53
54 package org.swixml.converters;
55
56 import org.jdom.Attribute;
57 import org.swixml.Converter;
58 import org.swixml.Localizer;
59 import org.swixml.SwingEngine;
60
61 import java.awt.*;
62 import java.lang.reflect.Field JavaDoc;
63 import java.lang.reflect.Modifier JavaDoc;
64 import java.util.StringTokenizer JavaDoc;
65
66 /**
67  * The ColorConverter class defines a Converter that turns the Strings into a Color object
68  *
69  * @author <a HREF="mailto:wolf@paulus.com">Wolf Paulus</a>
70  * @version $Revision: 1.1 $
71  *
72  * @see java.awt.Color
73
74  *
75  * <h3>Examples for Valid XML attribute notations:</h3>
76  * <pre><b>The following example show valid xml attributes to create Color objects:</b><br>
77  * <ul>
78  * <li>background="3399CC"</li>
79  * <li>background="red"</li>
80  * <li>foreground="991144"</li>
81  * </ul>
82  * </pre>
83  */
84 public class ColorConverter implements Converter {
85   /** converter's return type */
86   public static final Class JavaDoc TEMPLATE = Color.class;
87
88   /**
89     * Returns a <code>java.awt.Color</code> runtime object
90     * @param type <code>Class</code> not used
91     * @param attr <code>Attribute</code> value needs to provide a String
92     * @return runtime type is subclass of <code>java.awt.Color</code>
93     */
94   public Object JavaDoc convert( final Class JavaDoc type, final Attribute attr, Localizer localizer ) {
95     return ColorConverter.conv(type,attr);
96   }
97   /**
98    * Returns a <code>java.awt.Color</code> runtime object
99    * @param type <code>Class</code> not used
100    * @param attr <code>Attribute</code> value needs to provide a String
101    * @return runtime type is subclass of <code>java.awt.Color</code>
102    */
103   public static Object JavaDoc conv( final Class JavaDoc type, final Attribute attr ) {
104     if (attr != null) {
105       try {
106         Field JavaDoc field = Color.class.getField( attr.getValue() );
107         if (Color.class.equals( field.getType() ) && Modifier.isStatic( field.getModifiers() ))
108           return field.get( Color.class );
109       } catch (NoSuchFieldException JavaDoc e) {
110       } catch (SecurityException JavaDoc e) {
111       } catch (IllegalAccessException JavaDoc e) {
112       }
113       StringTokenizer JavaDoc st = new StringTokenizer JavaDoc( attr.getValue(), "," );
114       if (1 == st.countTokens()) {
115         try {
116           return new Color( Integer.parseInt( st.nextToken().trim(), 16 ) );
117         } catch (NumberFormatException JavaDoc e) {
118            if (SwingEngine.DEBUG_MODE) System.err.println( e );
119           return null;
120         }
121       }
122       int[] para = Util.ia( st );
123       if (4 <= para.length)
124         return new Color( para[0], para[1], para[2], para[3] );
125       if (3 <= para.length)
126         return new Color( para[0], para[1], para[2] );
127       if (1 <= para.length)
128         return new Color( para[0] );
129     }
130     return null;
131   }
132
133
134   /**
135    * A <code>Converters</code> conversTo method informs about the Class type the converter
136    * is returning when its <code>convert</code> method is called
137    * @return <code>Class</code> - the Class the converter is returning when its convert method is called
138    */
139   public Class JavaDoc convertsTo() {
140     return TEMPLATE;
141   }
142
143 }
144
Popular Tags