src/java/org/apache/log4j/pattern/DatePatternConverter.java

/*
 * ============================================================================
 *                   The Apache Software License, Version 1.1
 * ============================================================================
 *
 *    Copyright (C) 1999 The Apache Software Foundation. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modifica-
 * tion, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of  source code must  retain the above copyright  notice,
 *    this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * 3. The end-user documentation included with the redistribution, if any, must
 *    include  the following  acknowledgment:  "This product includes  software
 *    developed  by the  Apache Software Foundation  (http://www.apache.org/)."
 *    Alternately, this  acknowledgment may  appear in the software itself,  if
 *    and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "log4j" and  "Apache Software Foundation"  must not be used to
 *    endorse  or promote  products derived  from this  software without  prior
 *    written permission. For written permission, please contact
 *    apache@apache.org.
 *
 * 5. Products  derived from this software may not  be called "Apache", nor may
 *    "Apache" appear  in their name,  without prior written permission  of the
 *    Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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 * APACHE SOFTWARE  FOUNDATION  OR ITS CONTRIBUTORS  BE LIABLE FOR  ANY DIRECT,
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 * (INCLUDING  NEGLIGENCE OR  OTHERWISE) ARISING IN  ANY WAY OUT OF THE  USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * This software  consists of voluntary contributions made  by many individuals
 * on  behalf of the Apache Software  Foundation.  For more  information on the
 * Apache Software Foundation, please see <http://www.apache.org/>.
 *
 */

package org.apache.log4j.pattern;

import org.apache.log4j.Logger;
import org.apache.log4j.spi.LoggingEvent;

import java.text.DateFormat;
import java.text.FieldPosition;
import java.text.SimpleDateFormat;

import java.util.Date;


/**
 * Return the events thread (usually the current thread) in a StringBuffer.
 * This buffer is recycled!
 *
 * @author Ceki G&uuml;lc&uuml;
 */
public class DatePatternConverter extends PatternConverter {
  // We assume that each PatternConveter instance is unique within a layout, 
  // which is unique within an appender. We further assume that callas to the 
  // appender method are serialized (per appender).
  StringBuffer buf;
  Logger logger = Logger.getLogger(DatePatternConverter.class);
  private DateFormat df;
  private Date date;
  protected FieldPosition pos = new FieldPosition(0);

  public DatePatternConverter(FormattingInfo formattingInfo) {
    super(formattingInfo);
    this.buf = new StringBuffer(32);
    date = new Date();
  }

  public void setOption(String option) {
    super.setOption(option);

    try {
      df = new SimpleDateFormat(option);
      System.out.println("======="+df);
    } catch (IllegalArgumentException e) {
      logger.error("Could not instantiate SimpleDateFormat with " + option, e);

      // detault for the IDO8601 format
      df = new SimpleDateFormat("yyyy-mm-dd HH:mm:ss,SSS");
    }
  }

  public StringBuffer convert(LoggingEvent event) {
    buf.setLength(0);

    date.setTime(event.timeStamp);

    String converted = null;

    try {
      df.format(date, buf, pos);
    } catch (Exception ex) {
      logger.error("Error occured while converting date.", ex);
    }

    return buf;
  }
}