/**
* Licensed under the Artistic License; you may not use this file
* except in compliance with the License.
* You may obtain a copy of the License at
*
* http://displaytag.sourceforge.net/license.html
*
* THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
package org.displaytag.decorator;
import java.text.MessageFormat;
import java.util.Locale;
import javax.servlet.jsp.PageContext;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.displaytag.Messages;
import org.displaytag.properties.MediaTypeEnum;
/**
* A decorator that simply formats input Objects using a <code>java.text.messageFormat</code>. By design, this
* implementations handle MessageFormat errors by returning the unformatted value and logging the exception.
* @author Fabrizio Giustina
* @version $Id$
*/
public class MessageFormatColumnDecorator implements DisplaytagColumnDecorator
{
/**
* Logger.
*/
private static Log log = LogFactory.getLog(MessageFormatColumnDecorator.class);
/**
* Pre-compiled messageFormat.
*/
private MessageFormat format;
/**
* Instantiates a new MessageFormatColumnDecorator with a given pattern and locale.
* @param pattern see <code>java.text.messageFormat</code>
* @param locale current locale
* @see java.text.messageFormat
*/
public MessageFormatColumnDecorator(String pattern, Locale locale)
{
this.format = new MessageFormat(pattern, locale);
}
/**
* @see org.displaytag.decorator.DisplaytagColumnDecorator#decorate(Object, PageContext, MediaTypeEnum)
*/
public Object decorate(Object columnValue, PageContext pageContext, MediaTypeEnum media)
{
try
{
return this.format.format(new Object[]{columnValue});
}
catch (IllegalArgumentException e)
{
log.error(Messages.getString("MessageFormatColumnDecorator.invalidArgument", new Object[]{ //$NON-NLS-1$
this.format.toPattern(), columnValue != null ? columnValue.getClass().getName() : "null"})); //$NON-NLS-1$
return columnValue;
}
}
}