1 /**
2 * Licensed under the Artistic License; you may not use this file
3 * except in compliance with the License.
4 * You may obtain a copy of the License at
5 *
6 * http://displaytag.sourceforge.net/license.html
7 *
8 * THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR
9 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
10 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
11 */
12 package org.displaytag.decorator;
13
14 import java.text.MessageFormat;
15 import java.util.Locale;
16
17 import javax.servlet.jsp.PageContext;
18
19 import org.apache.commons.logging.Log;
20 import org.apache.commons.logging.LogFactory;
21 import org.displaytag.Messages;
22 import org.displaytag.properties.MediaTypeEnum;
23
24
25 /**
26 * A decorator that simply formats input Objects using a <code>java.text.messageFormat</code>. By design, this
27 * implementations handle MessageFormat errors by returning the unformatted value and logging the exception.
28 * @author Fabrizio Giustina
29 * @version $Id$
30 */
31 public class MessageFormatColumnDecorator implements DisplaytagColumnDecorator
32 {
33
34 /**
35 * Logger.
36 */
37 private static Log log = LogFactory.getLog(MessageFormatColumnDecorator.class);
38
39 /**
40 * Pre-compiled messageFormat.
41 */
42 private MessageFormat format;
43
44 /**
45 * Instantiates a new MessageFormatColumnDecorator with a given pattern and locale.
46 * @param pattern see <code>java.text.messageFormat</code>
47 * @param locale current locale
48 * @see java.text.messageFormat
49 */
50 public MessageFormatColumnDecorator(String pattern, Locale locale)
51 {
52 this.format = new MessageFormat(pattern, locale);
53 }
54
55 /**
56 * @see org.displaytag.decorator.DisplaytagColumnDecorator#decorate(Object, PageContext, MediaTypeEnum)
57 */
58 public Object decorate(Object columnValue, PageContext pageContext, MediaTypeEnum media)
59 {
60 try
61 {
62 return this.format.format(new Object[]{columnValue});
63 }
64 catch (IllegalArgumentException e)
65 {
66 log.error(Messages.getString("MessageFormatColumnDecorator.invalidArgument", new Object[]{ //$NON-NLS-1$
67 this.format.toPattern(), columnValue != null ? columnValue.getClass().getName() : "null"})); //$NON-NLS-1$
68
69 return columnValue;
70 }
71 }
72 }
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