org.apache.log4j.helpers.AbsoluteTimeDateFormat 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.DateFormat;
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 "HH:mm:ss,SSS" for example, "15:49:37,459".
*
* @since 0.7.5
*/
public class AbsoluteTimeDateFormat extends DateFormat {
private static final long serialVersionUID = -388856345976723342L;
/**
* String constant used to specify {@link org.apache.log4j.helpers.AbsoluteTimeDateFormat} in layouts. Current value is
* ABSOLUTE.
*/
public final static String ABS_TIME_DATE_FORMAT = "ABSOLUTE";
/**
* String constant used to specify {@link org.apache.log4j.helpers.DateTimeDateFormat} in layouts. Current value is
* DATE.
*/
public final static String DATE_AND_TIME_DATE_FORMAT = "DATE";
/**
* String constant used to specify {@link org.apache.log4j.helpers.ISO8601DateFormat} in layouts. Current value is
* ISO8601.
*/
public final static String ISO8601_DATE_FORMAT = "ISO8601";
private static long previousTime;
private static char[] previousTimeWithoutMillis = new char[9]; // "HH:mm:ss."
public AbsoluteTimeDateFormat() {
setCalendar(Calendar.getInstance());
}
public AbsoluteTimeDateFormat(final TimeZone timeZone) {
setCalendar(Calendar.getInstance(timeZone));
}
/**
* Appends to sbuf the time in the format "HH:mm:ss,SSS" for example, "15:49:37,459"
*
* @param date the date to format
* @param sbuf the string buffer to write to
* @param fieldPosition remains untouched
*/
@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) != previousTime || previousTimeWithoutMillis[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 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(), previousTimeWithoutMillis, 0);
previousTime = now - millis;
} else {
sbuf.append(previousTimeWithoutMillis);
}
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;
}
}