DurationFormatUtils.java
/*
* 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.commons.lang3.time;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.Objects;
import java.util.TimeZone;
import java.util.stream.Stream;
import org.apache.commons.lang3.StringUtils;
import org.apache.commons.lang3.Validate;
/**
* Duration formatting utilities and constants. The following table describes the tokens
* used in the pattern language for formatting.
* <table border="1">
* <caption>Pattern Tokens</caption>
* <tr><th>character</th><th>duration element</th></tr>
* <tr><td>y</td><td>years</td></tr>
* <tr><td>M</td><td>months</td></tr>
* <tr><td>d</td><td>days</td></tr>
* <tr><td>H</td><td>hours</td></tr>
* <tr><td>m</td><td>minutes</td></tr>
* <tr><td>s</td><td>seconds</td></tr>
* <tr><td>S</td><td>milliseconds</td></tr>
* <tr><td>'text'</td><td>arbitrary text content</td></tr>
* </table>
*
* <b>Note: It's not currently possible to include a single-quote in a format.</b>
* <br>
* Token values are printed using decimal digits.
* A token character can be repeated to ensure that the field occupies a certain minimum
* size. Values will be left-padded with 0 unless padding is disabled in the method invocation.
* <br>
* Tokens can be marked as optional by surrounding them with brackets [ ]. These tokens will
* only be printed if the token value is non-zero. Literals within optional blocks will only be
* printed if the preceding non-literal token is non-zero. Leading optional literals will only
* be printed if the following non-literal is non-zero.
* Multiple optional blocks can be used to group literals with the desired token.
* <p>
* Notes on Optional Tokens:<br>
* <b>Multiple optional tokens without literals can result in impossible to understand output.</b><br>
* <b>Patterns where all tokens are optional can produce empty strings.</b><br>
* (See examples below)
* </p>
* <br>
* <table border="1">
* <caption>Example Output</caption>
* <tr><th>pattern</th><th>Duration.ofDays(1)</th><th>Duration.ofHours(1)</th><th>Duration.ofMinutes(1)</th><th>Duration.ZERO</th></tr>
* <tr><td>d'd'H'h'm'm's's'</td><td>1d0h0m0s</td><td>0d1h0m0s</td><td>0d0h1m0s</td><td>0d0h0m0s</td></tr>
* <tr><td>d'd'[H'h'm'm']s's'</td><td>1d0s</td><td>0d1h0s</td><td>0d1m0s</td><td>0d0s</td></tr>
* <tr><td>[d'd'H'h'm'm']s's'</td><td>1d0s</td><td>1h0s</td><td>1m0s</td><td>0s</td></tr>
* <tr><td>[d'd'H'h'm'm's's']</td><td>1d</td><td>1h</td><td>1m</td><td></td></tr>
* <tr><td>['{'d'}']HH':'mm</td><td>{1}00:00</td><td>01:00</td><td>00:01</td><td>00:00</td></tr>
* <tr><td>['{'dd'}']['<'HH'>']['('mm')']</td><td>{01}</td><td><01></td><td>(00)</td><td></td></tr>
* <tr><td>[dHms]</td><td>1</td><td>1</td><td>1</td><td></td></tr>
* </table>
* <b>Note: Optional blocks cannot be nested.</b>
*
* @since 2.1
*/
public class DurationFormatUtils {
/**
* Element that is parsed from the format pattern.
*/
static class Token {
/** Empty array. */
private static final Token[] EMPTY_ARRAY = {};
/**
* Helper method to determine if a set of tokens contain a value
*
* @param tokens set to look in
* @param value to look for
* @return boolean {@code true} if contained
*/
static boolean containsTokenWithValue(final Token[] tokens, final Object value) {
return Stream.of(tokens).anyMatch(token -> token.getValue() == value);
}
private final CharSequence value;
private int count;
private int optionalIndex = -1;
/**
* Wraps a token around a value. A value would be something like a 'Y'.
*
* @param value value to wrap, non-null.
* @param optional whether the token is optional
* @param optionalIndex the index of the optional token within the pattern
*/
Token(final CharSequence value, final boolean optional, final int optionalIndex) {
this.value = Objects.requireNonNull(value, "value");
this.count = 1;
if (optional) {
this.optionalIndex = optionalIndex;
}
}
/**
* Supports equality of this Token to another Token.
*
* @param obj2 Object to consider equality of
* @return boolean {@code true} if equal
*/
@Override
public boolean equals(final Object obj2) {
if (obj2 instanceof Token) {
final Token tok2 = (Token) obj2;
if (this.value.getClass() != tok2.value.getClass()) {
return false;
}
if (this.count != tok2.count) {
return false;
}
if (this.value instanceof StringBuilder) {
return this.value.toString().equals(tok2.value.toString());
}
if (this.value instanceof Number) {
return this.value.equals(tok2.value);
}
return this.value == tok2.value;
}
return false;
}
/**
* Gets the current number of values represented
*
* @return int number of values represented
*/
int getCount() {
return count;
}
/**
* Gets the particular value this token represents.
*
* @return Object value, non-null.
*/
Object getValue() {
return value;
}
/**
* Returns a hash code for the token equal to the
* hash code for the token's value. Thus 'TT' and 'TTTT'
* will have the same hash code.
*
* @return The hash code for the token
*/
@Override
public int hashCode() {
return this.value.hashCode();
}
/**
* Adds another one of the value
*/
void increment() {
count++;
}
/**
* Represents this token as a String.
*
* @return String representation of the token
*/
@Override
public String toString() {
return StringUtils.repeat(this.value.toString(), this.count);
}
}
private static final int MINUTES_PER_HOUR = 60;
private static final int SECONDS_PER_MINUTES = 60;
private static final int HOURS_PER_DAY = 24;
/**
* Pattern used with {@link FastDateFormat} and {@link SimpleDateFormat}
* for the ISO 8601 period format used in durations.
*
* @see org.apache.commons.lang3.time.FastDateFormat
* @see java.text.SimpleDateFormat
*/
public static final String ISO_EXTENDED_FORMAT_PATTERN = "'P'yyyy'Y'M'M'd'DT'H'H'm'M's.SSS'S'";
static final String y = "y";
static final String M = "M";
static final String d = "d";
static final String H = "H";
static final String m = "m";
static final String s = "s";
static final String S = "S";
/**
* The internal method to do the formatting.
*
* @param tokens the tokens
* @param years the number of years
* @param months the number of months
* @param days the number of days
* @param hours the number of hours
* @param minutes the number of minutes
* @param seconds the number of seconds
* @param milliseconds the number of millis
* @param padWithZeros whether to pad
* @return the formatted string
*/
static String format(final Token[] tokens, final long years, final long months, final long days, final long hours, final long minutes,
final long seconds,
final long milliseconds, final boolean padWithZeros) {
final StringBuilder buffer = new StringBuilder();
boolean lastOutputSeconds = false;
boolean lastOutputZero = false;
int optionalStart = -1;
boolean firstOptionalNonLiteral = false;
int optionalIndex = -1;
boolean inOptional = false;
for (final Token token : tokens) {
final Object value = token.getValue();
final boolean isLiteral = value instanceof StringBuilder;
final int count = token.getCount();
if (optionalIndex != token.optionalIndex) {
optionalIndex = token.optionalIndex;
if (optionalIndex > -1) {
//entering new optional block
optionalStart = buffer.length();
lastOutputZero = false;
inOptional = true;
firstOptionalNonLiteral = false;
} else {
//leaving optional block
inOptional = false;
}
}
if (isLiteral) {
if (!inOptional || !lastOutputZero) {
buffer.append(value.toString());
}
} else if (value.equals(y)) {
lastOutputSeconds = false;
lastOutputZero = years == 0;
if (!inOptional || !lastOutputZero) {
buffer.append(paddedValue(years, padWithZeros, count));
}
} else if (value.equals(M)) {
lastOutputSeconds = false;
lastOutputZero = months == 0;
if (!inOptional || !lastOutputZero) {
buffer.append(paddedValue(months, padWithZeros, count));
}
} else if (value.equals(d)) {
lastOutputSeconds = false;
lastOutputZero = days == 0;
if (!inOptional || !lastOutputZero) {
buffer.append(paddedValue(days, padWithZeros, count));
}
} else if (value.equals(H)) {
lastOutputSeconds = false;
lastOutputZero = hours == 0;
if (!inOptional || !lastOutputZero) {
buffer.append(paddedValue(hours, padWithZeros, count));
}
} else if (value.equals(m)) {
lastOutputSeconds = false;
lastOutputZero = minutes == 0;
if (!inOptional || !lastOutputZero) {
buffer.append(paddedValue(minutes, padWithZeros, count));
}
} else if (value.equals(s)) {
lastOutputSeconds = true;
lastOutputZero = seconds == 0;
if (!inOptional || !lastOutputZero) {
buffer.append(paddedValue(seconds, padWithZeros, count));
}
} else if (value.equals(S)) {
lastOutputZero = milliseconds == 0;
if (!inOptional || !lastOutputZero) {
if (lastOutputSeconds) {
// ensure at least 3 digits are displayed even if padding is not selected
final int width = padWithZeros ? Math.max(3, count) : 3;
buffer.append(paddedValue(milliseconds, true, width));
} else {
buffer.append(paddedValue(milliseconds, padWithZeros, count));
}
}
lastOutputSeconds = false;
}
//as soon as we hit first nonliteral in optional, check for literal prefix
if (inOptional && !isLiteral && !firstOptionalNonLiteral) {
firstOptionalNonLiteral = true;
if (lastOutputZero) {
buffer.delete(optionalStart, buffer.length());
}
}
}
return buffer.toString();
}
/**
* Formats the time gap as a string, using the specified format, and padding with zeros.
*
* <p>This method formats durations using the days and lower fields of the
* format pattern. Months and larger are not used.</p>
*
* @param durationMillis the duration to format
* @param format the way in which to format the duration, not null
* @return the formatted duration, not null
* @throws IllegalArgumentException if durationMillis is negative
*/
public static String formatDuration(final long durationMillis, final String format) {
return formatDuration(durationMillis, format, true);
}
/**
* Formats the time gap as a string, using the specified format.
* Padding the left-hand side side of numbers with zeroes is optional.
*
* <p>This method formats durations using the days and lower fields of the
* format pattern. Months and larger are not used.</p>
*
* @param durationMillis the duration to format
* @param format the way in which to format the duration, not null
* @param padWithZeros whether to pad the left-hand side side of numbers with 0's
* @return the formatted duration, not null
* @throws IllegalArgumentException if durationMillis is negative
*/
public static String formatDuration(final long durationMillis, final String format, final boolean padWithZeros) {
Validate.inclusiveBetween(0, Long.MAX_VALUE, durationMillis, "durationMillis must not be negative");
final Token[] tokens = lexx(format);
long days = 0;
long hours = 0;
long minutes = 0;
long seconds = 0;
long milliseconds = durationMillis;
if (Token.containsTokenWithValue(tokens, d)) {
days = milliseconds / DateUtils.MILLIS_PER_DAY;
milliseconds -= days * DateUtils.MILLIS_PER_DAY;
}
if (Token.containsTokenWithValue(tokens, H)) {
hours = milliseconds / DateUtils.MILLIS_PER_HOUR;
milliseconds -= hours * DateUtils.MILLIS_PER_HOUR;
}
if (Token.containsTokenWithValue(tokens, m)) {
minutes = milliseconds / DateUtils.MILLIS_PER_MINUTE;
milliseconds -= minutes * DateUtils.MILLIS_PER_MINUTE;
}
if (Token.containsTokenWithValue(tokens, s)) {
seconds = milliseconds / DateUtils.MILLIS_PER_SECOND;
milliseconds -= seconds * DateUtils.MILLIS_PER_SECOND;
}
return format(tokens, 0, 0, days, hours, minutes, seconds, milliseconds, padWithZeros);
}
/**
* Formats the time gap as a string.
*
* <p>The format used is ISO 8601-like: {@code HH:mm:ss.SSS}.</p>
*
* @param durationMillis the duration to format
* @return the formatted duration, not null
* @throws IllegalArgumentException if durationMillis is negative
*/
public static String formatDurationHMS(final long durationMillis) {
return formatDuration(durationMillis, "HH:mm:ss.SSS");
}
/**
* Formats the time gap as a string.
*
* <p>The format used is the ISO 8601 period format.</p>
*
* <p>This method formats durations using the days and lower fields of the
* ISO format pattern, such as P7D6TH5M4.321S.</p>
*
* @param durationMillis the duration to format
* @return the formatted duration, not null
* @throws IllegalArgumentException if durationMillis is negative
*/
public static String formatDurationISO(final long durationMillis) {
return formatDuration(durationMillis, ISO_EXTENDED_FORMAT_PATTERN, false);
}
/**
* Formats an elapsed time into a pluralization correct string.
*
* <p>This method formats durations using the days and lower fields of the
* format pattern. Months and larger are not used.</p>
*
* @param durationMillis the elapsed time to report in milliseconds
* @param suppressLeadingZeroElements suppresses leading 0 elements
* @param suppressTrailingZeroElements suppresses trailing 0 elements
* @return the formatted text in days/hours/minutes/seconds, not null
* @throws IllegalArgumentException if durationMillis is negative
*/
public static String formatDurationWords(
final long durationMillis,
final boolean suppressLeadingZeroElements,
final boolean suppressTrailingZeroElements) {
// This method is generally replaceable by the format method, but
// there are a series of tweaks and special cases that require
// trickery to replicate.
String duration = formatDuration(durationMillis, "d' days 'H' hours 'm' minutes 's' seconds'");
if (suppressLeadingZeroElements) {
// this is a temporary marker on the front. Like ^ in regexp.
duration = " " + duration;
String tmp = StringUtils.replaceOnce(duration, " 0 days", StringUtils.EMPTY);
if (tmp.length() != duration.length()) {
duration = tmp;
tmp = StringUtils.replaceOnce(duration, " 0 hours", StringUtils.EMPTY);
if (tmp.length() != duration.length()) {
duration = tmp;
tmp = StringUtils.replaceOnce(duration, " 0 minutes", StringUtils.EMPTY);
duration = tmp;
}
}
if (!duration.isEmpty()) {
// strip the space off again
duration = duration.substring(1);
}
}
if (suppressTrailingZeroElements) {
String tmp = StringUtils.replaceOnce(duration, " 0 seconds", StringUtils.EMPTY);
if (tmp.length() != duration.length()) {
duration = tmp;
tmp = StringUtils.replaceOnce(duration, " 0 minutes", StringUtils.EMPTY);
if (tmp.length() != duration.length()) {
duration = tmp;
tmp = StringUtils.replaceOnce(duration, " 0 hours", StringUtils.EMPTY);
if (tmp.length() != duration.length()) {
duration = StringUtils.replaceOnce(tmp, " 0 days", StringUtils.EMPTY);
}
}
}
}
// handle plurals
duration = " " + duration;
duration = StringUtils.replaceOnce(duration, " 1 seconds", " 1 second");
duration = StringUtils.replaceOnce(duration, " 1 minutes", " 1 minute");
duration = StringUtils.replaceOnce(duration, " 1 hours", " 1 hour");
duration = StringUtils.replaceOnce(duration, " 1 days", " 1 day");
return duration.trim();
}
/**
* Formats the time gap as a string, using the specified format.
* Padding the left-hand side side of numbers with zeroes is optional.
*
* @param startMillis the start of the duration
* @param endMillis the end of the duration
* @param format the way in which to format the duration, not null
* @return the formatted duration, not null
* @throws IllegalArgumentException if startMillis is greater than endMillis
*/
public static String formatPeriod(final long startMillis, final long endMillis, final String format) {
return formatPeriod(startMillis, endMillis, format, true, TimeZone.getDefault());
}
/**
* <p>Formats the time gap as a string, using the specified format.
* Padding the left-hand side side of numbers with zeroes is optional and
* the time zone may be specified.
*
* <p>When calculating the difference between months/days, it chooses to
* calculate months first. So when working out the number of months and
* days between January 15th and March 10th, it choose 1 month and
* 23 days gained by choosing January->February = 1 month and then
* calculating days forwards, and not the 1 month and 26 days gained by
* choosing March -> February = 1 month and then calculating days
* backwards.</p>
*
* <p>For more control, the <a href="https://www.joda.org/joda-time/">Joda-Time</a>
* library is recommended.</p>
*
* @param startMillis the start of the duration
* @param endMillis the end of the duration
* @param format the way in which to format the duration, not null
* @param padWithZeros whether to pad the left-hand side side of numbers with 0's
* @param timezone the millis are defined in
* @return the formatted duration, not null
* @throws IllegalArgumentException if startMillis is greater than endMillis
*/
public static String formatPeriod(final long startMillis, final long endMillis, final String format, final boolean padWithZeros,
final TimeZone timezone) {
Validate.isTrue(startMillis <= endMillis, "startMillis must not be greater than endMillis");
// Used to optimize for differences under 28 days and
// called formatDuration(millis, format); however this did not work
// over leap years.
// TODO: Compare performance to see if anything was lost by
// losing this optimization.
final Token[] tokens = lexx(format);
// time zones get funky around 0, so normalizing everything to GMT
// stops the hours being off
final Calendar start = Calendar.getInstance(timezone);
start.setTime(new Date(startMillis));
final Calendar end = Calendar.getInstance(timezone);
end.setTime(new Date(endMillis));
// initial estimates
long milliseconds = end.get(Calendar.MILLISECOND) - start.get(Calendar.MILLISECOND);
int seconds = end.get(Calendar.SECOND) - start.get(Calendar.SECOND);
int minutes = end.get(Calendar.MINUTE) - start.get(Calendar.MINUTE);
int hours = end.get(Calendar.HOUR_OF_DAY) - start.get(Calendar.HOUR_OF_DAY);
int days = end.get(Calendar.DAY_OF_MONTH) - start.get(Calendar.DAY_OF_MONTH);
int months = end.get(Calendar.MONTH) - start.get(Calendar.MONTH);
int years = end.get(Calendar.YEAR) - start.get(Calendar.YEAR);
// each initial estimate is adjusted in case it is under 0
while (milliseconds < 0) {
milliseconds += DateUtils.MILLIS_PER_SECOND;
seconds -= 1;
}
while (seconds < 0) {
seconds += SECONDS_PER_MINUTES;
minutes -= 1;
}
while (minutes < 0) {
minutes += MINUTES_PER_HOUR;
hours -= 1;
}
while (hours < 0) {
hours += HOURS_PER_DAY;
days -= 1;
}
if (Token.containsTokenWithValue(tokens, M)) {
while (days < 0) {
days += start.getActualMaximum(Calendar.DAY_OF_MONTH);
months -= 1;
start.add(Calendar.MONTH, 1);
}
while (months < 0) {
months += 12;
years -= 1;
}
if (!Token.containsTokenWithValue(tokens, y) && years != 0) {
while (years != 0) {
months += 12 * years;
years = 0;
}
}
} else {
// there are no M's in the format string
if (!Token.containsTokenWithValue(tokens, y)) {
int target = end.get(Calendar.YEAR);
if (months < 0) {
// target is end-year -1
target -= 1;
}
while (start.get(Calendar.YEAR) != target) {
days += start.getActualMaximum(Calendar.DAY_OF_YEAR) - start.get(Calendar.DAY_OF_YEAR);
// Not sure I grok why this is needed, but the brutal tests show it is
if (start instanceof GregorianCalendar &&
start.get(Calendar.MONTH) == Calendar.FEBRUARY &&
start.get(Calendar.DAY_OF_MONTH) == 29) {
days += 1;
}
start.add(Calendar.YEAR, 1);
days += start.get(Calendar.DAY_OF_YEAR);
}
years = 0;
}
while (start.get(Calendar.MONTH) != end.get(Calendar.MONTH)) {
days += start.getActualMaximum(Calendar.DAY_OF_MONTH);
start.add(Calendar.MONTH, 1);
}
months = 0;
while (days < 0) {
days += start.getActualMaximum(Calendar.DAY_OF_MONTH);
months -= 1;
start.add(Calendar.MONTH, 1);
}
}
// The rest of this code adds in values that
// aren't requested. This allows the user to ask for the
// number of months and get the real count and not just 0->11.
if (!Token.containsTokenWithValue(tokens, d)) {
hours += HOURS_PER_DAY * days;
days = 0;
}
if (!Token.containsTokenWithValue(tokens, H)) {
minutes += MINUTES_PER_HOUR * hours;
hours = 0;
}
if (!Token.containsTokenWithValue(tokens, m)) {
seconds += SECONDS_PER_MINUTES * minutes;
minutes = 0;
}
if (!Token.containsTokenWithValue(tokens, s)) {
milliseconds += DateUtils.MILLIS_PER_SECOND * seconds;
seconds = 0;
}
return format(tokens, years, months, days, hours, minutes, seconds, milliseconds, padWithZeros);
}
/**
* Formats the time gap as a string.
*
* <p>The format used is the ISO 8601 period format.</p>
*
* @param startMillis the start of the duration to format
* @param endMillis the end of the duration to format
* @return the formatted duration, not null
* @throws IllegalArgumentException if startMillis is greater than endMillis
*/
public static String formatPeriodISO(final long startMillis, final long endMillis) {
return formatPeriod(startMillis, endMillis, ISO_EXTENDED_FORMAT_PATTERN, false, TimeZone.getDefault());
}
/**
* Parses a classic date format string into Tokens
*
* @param format the format to parse, not null
* @return array of Token[]
*/
static Token[] lexx(final String format) {
final ArrayList<Token> list = new ArrayList<>(format.length());
boolean inLiteral = false;
// Although the buffer is stored in a Token, the Tokens are only
// used internally, so cannot be accessed by other threads
StringBuilder buffer = null;
Token previous = null;
boolean inOptional = false;
int optionalIndex = -1;
for (int i = 0; i < format.length(); i++) {
final char ch = format.charAt(i);
if (inLiteral && ch != '\'') {
buffer.append(ch); // buffer can't be null if inLiteral is true
continue;
}
String value = null;
switch (ch) {
// TODO: Need to handle escaping of '
case '[':
if (inOptional) {
throw new IllegalArgumentException("Nested optional block at index: " + i);
}
optionalIndex++;
inOptional = true;
break;
case ']':
if (!inOptional) {
throw new IllegalArgumentException("Attempting to close unopened optional block at index: " + i);
}
inOptional = false;
break;
case '\'':
if (inLiteral) {
buffer = null;
inLiteral = false;
} else {
buffer = new StringBuilder();
list.add(new Token(buffer, inOptional, optionalIndex));
inLiteral = true;
}
break;
case 'y':
value = y;
break;
case 'M':
value = M;
break;
case 'd':
value = d;
break;
case 'H':
value = H;
break;
case 'm':
value = m;
break;
case 's':
value = s;
break;
case 'S':
value = S;
break;
default:
if (buffer == null) {
buffer = new StringBuilder();
list.add(new Token(buffer, inOptional, optionalIndex));
}
buffer.append(ch);
}
if (value != null) {
if (previous != null && previous.getValue().equals(value)) {
previous.increment();
} else {
final Token token = new Token(value, inOptional, optionalIndex);
list.add(token);
previous = token;
}
buffer = null;
}
}
if (inLiteral) { // i.e. we have not found the end of the literal
throw new IllegalArgumentException("Unmatched quote in format: " + format);
}
if (inOptional) { // i.e. we have not found the end of the literal
throw new IllegalArgumentException("Unmatched optional in format: " + format);
}
return list.toArray(Token.EMPTY_ARRAY);
}
/**
* Converts a {@code long} to a {@link String} with optional
* zero padding.
*
* @param value the value to convert
* @param padWithZeros whether to pad with zeroes
* @param count the size to pad to (ignored if {@code padWithZeros} is false)
* @return the string result
*/
private static String paddedValue(final long value, final boolean padWithZeros, final int count) {
final String longString = Long.toString(value);
return padWithZeros ? StringUtils.leftPad(longString, count, '0') : longString;
}
/**
* DurationFormatUtils instances should NOT be constructed in standard programming.
*
* <p>This constructor is public to permit tools that require a JavaBean instance
* to operate.</p>
*
* @deprecated TODO Make private in 4.0.
*/
@Deprecated
public DurationFormatUtils() {
// empty
}
}