org.apache.log4j.helpers.ISO8601DateFormat Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.log4j.helpers;
import java.text.FieldPosition;
import java.text.ParsePosition;
import java.util.Calendar;
import java.util.Date;
import java.util.TimeZone;
/**
* Formats a {@link Date} in the format "yyyy-MM-dd HH:mm:ss,SSS" for example "1999-11-27 15:49:37,459".
*
*
* Refer to the summary of the International Standard Date and Time
* Notation for more information on this format.
*
*
* @since 0.7.5
*/
public class ISO8601DateFormat extends AbsoluteTimeDateFormat {
private static final long serialVersionUID = -759840745298755296L;
static private long lastTime;
static private char[] lastTimeString = new char[20];
public ISO8601DateFormat() {
}
public ISO8601DateFormat(final TimeZone timeZone) {
super(timeZone);
}
/**
* Appends a date in the format "YYYY-mm-dd HH:mm:ss,SSS" to sbuf. For example: "1999-11-27 15:49:37,459".
*
* @param sbuf the StringBuffer to write to
*/
@Override
public StringBuffer format(final Date date, final StringBuffer sbuf, final FieldPosition fieldPosition) {
final long now = date.getTime();
final int millis = (int) (now % 1000);
if ((now - millis) != lastTime || lastTimeString[0] == 0) {
// 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);
final int start = sbuf.length();
final 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);
final int day = calendar.get(Calendar.DAY_OF_MONTH);
if (day < 10) {
sbuf.append('0');
}
sbuf.append(day);
sbuf.append(' ');
final int hour = calendar.get(Calendar.HOUR_OF_DAY);
if (hour < 10) {
sbuf.append('0');
}
sbuf.append(hour);
sbuf.append(':');
final int mins = calendar.get(Calendar.MINUTE);
if (mins < 10) {
sbuf.append('0');
}
sbuf.append(mins);
sbuf.append(':');
final 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;
}
/**
* Always returns null.
*/
@Override
public Date parse(final String s, final ParsePosition pos) {
return null;
}
}