/* * Copyright (C) The Apache Software Foundation. All rights reserved. * * This software is published under the terms of the Apache Software License * version 1.1, a copy of which has been included  with this distribution in * the LICENSE.txt file. */package org.apache.log4j.helpers;import java.util.Calendar;import java.util.TimeZone;import java.util.Date;// Contributors: Arndt Schoenewald <arndt@ibm23093i821.mc.schoenewald.de>/**   Formats a {@link Date} in the format "YYYY-mm-dd HH:mm:ss,SSS" for example   "1999-11-27 15:49:37,459".   <p>Refer to the <a   href=http://www.cl.cam.ac.uk/~mgk25/iso-time.html>summary of the   International Standard Date and Time Notation</a> for more   information on this format.   @author Ceki G&uuml;lc&uuml;   @author Andrew Vajoczki      @since 0.7.5*///Modifiers:	Witmate [Nov,2004: Modified for log4j2me]public class ISO8601DateFormat extends AbsoluteTimeDateFormat {  public  ISO8601DateFormat() {  }  public  ISO8601DateFormat(TimeZone timeZone) {    super(timeZone);  }  static private long   lastTime;  static private char[] lastTimeString = new char[20];  /**     Appends a date in the format "YYYY-mm-dd HH:mm:ss,SSS"     to <code>sbuf</code>. For example: "1999-11-27 15:49:37,459".     @param sbuf the <code>StringBuffer</code> to write to  */  public  StringBuffer format(Date date, StringBuffer sbuf) { //FieldPosition fieldPosition    long now = date.getTime();    int millis = (int)(now % 1000);    if ((now - millis) != lastTime) {      // We reach this point at most once per second      // across all threads instead of each time format()      // is called. This saves considerable CPU time.      calendar.setTime(date);      int start = sbuf.length();      int year =  calendar.get(Calendar.YEAR);      sbuf.append(year);      String month;      switch(calendar.get(Calendar.MONTH)) {      case Calendar.JANUARY: month = "-01-"; break;      case Calendar.FEBRUARY: month = "-02-";  break;      case Calendar.MARCH: month = "-03-"; break;      case Calendar.APRIL: month = "-04-";  break;      case Calendar.MAY: month = "-05-"; break;      case Calendar.JUNE: month = "-06-";  break;      case Calendar.JULY: month = "-07-"; break;      case Calendar.AUGUST: month = "-08-";  break;      case Calendar.SEPTEMBER: month = "-09-"; break;      case Calendar.OCTOBER: month = "-10-"; break;      case Calendar.NOVEMBER: month = "-11-";  break;      case Calendar.DECEMBER: month = "-12-";  break;      default: month = "-NA-"; break;      }      sbuf.append(month);      int day = calendar.get(Calendar.DAY_OF_MONTH);      if(day < 10)	sbuf.append('0');      sbuf.append(day);      sbuf.append(' ');      int hour = calendar.get(Calendar.HOUR_OF_DAY);      if(hour < 10) {	sbuf.append('0');      }      sbuf.append(hour);      sbuf.append(':');      int mins = calendar.get(Calendar.MINUTE);      if(mins < 10) {	sbuf.append('0');      }      sbuf.append(mins);      sbuf.append(':');      int secs = calendar.get(Calendar.SECOND);      if(secs < 10) {	sbuf.append('0');      }      sbuf.append(secs);      sbuf.append(',');      // store the time string for next time to avoid recomputation      sbuf.getChars(start, sbuf.length(), lastTimeString, 0);      lastTime = now - millis;    }    else {      sbuf.append(lastTimeString);    }    if (millis < 100)      sbuf.append('0');    if (millis < 10)      sbuf.append('0');    sbuf.append(millis);    return sbuf;  }  /**    This method does not do anything but return <code>null</code>.   */  public  Date parse(java.lang.String s) {//, ParsePosition pos    return null;  }}