/*
* 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;
import java.text.FieldPosition;
import java.text.ParsePosition;
// Contributors: Arndt Schoenewald <[email protected]>
/**
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 Gülcü
@author Andrew Vajoczki
@since 0.7.5
*/
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;
}
}
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