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Apache Commons Lang, a package of Java utility classes for the
classes that are in java.lang's hierarchy, or are considered to be so
standard as to justify existence in java.lang.
This is a port for GWT, which enables program, to use Apache Commons Lang
also in the frontend compiled by the gwt compiler to java-script.
The code is tested using the latest revision of the JDK for supported
LTS releases: 8, 11, 17 and 21 currently.
See https://github.com/apache/commons-lang/blob/master/.github/workflows/maven.yml
Please ensure your build environment is up-to-date and kindly report any build issues.
/**
* This class gets copy-and-pasted between the eu.future.earth.gwt.emul.java.util (used for
* development and testing) and com.google.gwt.emul.java.util packages (used for gwt
* compilation). Change the comments on the package declaration appropriately.
*/
//package eu.future.earth.gwt.emul.java.util;
package java.util;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import sun.util.calendar.BaseCalendar;
public class GregorianCalendar extends Calendar implements Cloneable {
private Date cached = null;
private int year = 0;
private int month = 0;
private int day = 0;
private int hour = 0;
private int minute = 0;
private int second = 0;
/**
* Value of the {@link #ERA} field indicating
* the period before the common era, the same value as {@link #BC}.
*
* @see #CE
*/
static final int BCE = 0;
/**
* Value of the {@link #ERA} field indicating
* the common era, the same value as {@link #AD}.
*
* @see #BCE
*/
static final int CE = 1;
private static final int EPOCH_OFFSET = 719163; // Fixed date of January 1, 1970 (Gregorian)
private static final int EPOCH_YEAR = 1970;
static final int MONTH_LENGTH[]
= {31,28,31,30,31,30,31,31,30,31,30,31}; // 0-based
static final int LEAP_MONTH_LENGTH[]
= {31,29,31,30,31,30,31,31,30,31,30,31}; // 0-based
// Useful millisecond constants. Although ONE_DAY and ONE_WEEK can fit
// into ints, they must be longs in order to prevent arithmetic overflow
// when performing (bug 4173516).
private static final int ONE_SECOND = 1000;
private static final int ONE_MINUTE = 60*ONE_SECOND;
private static final int ONE_HOUR = 60*ONE_MINUTE;
private static final long ONE_DAY = 24*ONE_HOUR;
private static final long ONE_WEEK = 7*ONE_DAY;
/*
*
* Greatest Least
* Field name Minimum Minimum Maximum Maximum
* ---------- ------- ------- ------- -------
* ERA 0 0 1 1
* YEAR 1 1 292269054 292278994
* MONTH 0 0 11 11
* WEEK_OF_YEAR 1 1 52* 53
* WEEK_OF_MONTH 0 0 4* 6
* DAY_OF_MONTH 1 1 28* 31
* DAY_OF_YEAR 1 1 365* 366
* DAY_OF_WEEK 1 1 7 7
* DAY_OF_WEEK_IN_MONTH -1 -1 4* 6
* AM_PM 0 0 1 1
* HOUR 0 0 11 11
* HOUR_OF_DAY 0 0 23 23
* MINUTE 0 0 59 59
* SECOND 0 0 59 59
* MILLISECOND 0 0 999 999
* ZONE_OFFSET -13:00 -13:00 14:00 14:00
* DST_OFFSET 0:00 0:00 0:20 2:00
*
* *: depends on the Gregorian change date
*/
static final int MIN_VALUES[] = {
BCE, // ERA
1, // YEAR
JANUARY, // MONTH
1, // WEEK_OF_YEAR
0, // WEEK_OF_MONTH
1, // DAY_OF_MONTH
1, // DAY_OF_YEAR
SUNDAY, // DAY_OF_WEEK
1, // DAY_OF_WEEK_IN_MONTH
AM, // AM_PM
0, // HOUR
0, // HOUR_OF_DAY
0, // MINUTE
0, // SECOND
0, // MILLISECOND
-13*ONE_HOUR, // ZONE_OFFSET (UNIX compatibility)
0 // DST_OFFSET
};
static final int LEAST_MAX_VALUES[] = {
CE, // ERA
292269054, // YEAR
DECEMBER, // MONTH
52, // WEEK_OF_YEAR
4, // WEEK_OF_MONTH
28, // DAY_OF_MONTH
365, // DAY_OF_YEAR
SATURDAY, // DAY_OF_WEEK
4, // DAY_OF_WEEK_IN
PM, // AM_PM
11, // HOUR
23, // HOUR_OF_DAY
59, // MINUTE
59, // SECOND
999, // MILLISECOND
14*ONE_HOUR, // ZONE_OFFSET
20*ONE_MINUTE // DST_OFFSET (historical least maximum)
};
static final int MAX_VALUES[] = {
CE, // ERA
292278994, // YEAR
DECEMBER, // MONTH
53, // WEEK_OF_YEAR
6, // WEEK_OF_MONTH
31, // DAY_OF_MONTH
366, // DAY_OF_YEAR
SATURDAY, // DAY_OF_WEEK
6, // DAY_OF_WEEK_IN
PM, // AM_PM
11, // HOUR
23, // HOUR_OF_DAY
59, // MINUTE
59, // SECOND
999, // MILLISECOND
14*ONE_HOUR, // ZONE_OFFSET
2*ONE_HOUR // DST_OFFSET (double summer time)
};
public GregorianCalendar() {
super();
setTime(new Date());
}
public Object clone() {
final GregorianCalendar clone = new GregorianCalendar();
clone.setFirstDayOfWeek(getFirstDayOfWeek());
clone.setMinimalDaysInFirstWeek(getMinimalDaysInFirstWeek());
clone.setTime(getTime());
return clone;
}
@SuppressWarnings("deprecation")
public void clear() {
cached = new Date(1970 - 1900, 0, 1, 0, 0, 0);
computeFields();
}
@SuppressWarnings("deprecation")
public void computeFields() {
year = cached.getYear() + 1900;
month = cached.getMonth();
day = cached.getDate();
hour = cached.getHours();
minute = cached.getMinutes();
second = cached.getSeconds();
}
@SuppressWarnings("deprecation")
public void computeTime() {
cached = new Date(year - 1900, month, day, hour, minute, second);
computeFields(); // recompute the fields because they may have been rolled
}
public Date getTime() {
computeTime();
return new Date(cached.getTime());
}
public void setTime(Date date) {
cached = new Date(date.getTime());
computeFields();
}
public void setTimeInMillis(long millis) {
cached = new Date(millis);
computeFields();
}
public long getTimeInMillis() {
computeTime();
return cached.getTime();
}
@SuppressWarnings("deprecation")
public int get(int field) {
computeTime();
switch (field) {
case YEAR: {
return year;
}
case MONTH: {
return month;
}
case DAY_OF_MONTH: {
return day;
}
case HOUR: {
return (hour > 11) ? hour - 12 : hour;
}
case AM_PM: {
if (hour < 12) return AM;
else return PM;
}
case HOUR_OF_DAY: {
return hour;
}
case MINUTE: {
return minute;
}
case SECOND: {
return second;
}
case DAY_OF_WEEK: {
return cached.getDay() + 1;
}
case DAY_OF_YEAR: {
return (compareDate(new Date(cached.getYear(), 0, 1), cached) + 1);
}
case WEEK_OF_YEAR: {
Date weekOne = getWeekOne(cached.getYear());
if (weekOne.after(cached)) {
weekOne = getWeekOne(cached.getYear() - 1);
}
int days = compareDate(weekOne, cached);
int week = ((days / 7) + 1);
if (week < 1) {
return 1;
} else if (week < 53) {
return week;
} else {
Date weekOneNextYear = getWeekOne(cached.getYear() + 1);
if (cached.before(weekOneNextYear)) {
return 53;
} else {
return 1;
}
}
}
}
return 0;
}
public void set(int field, int value) {
switch (field) {
case YEAR: {
year = value;
break;
}
case MONTH: {
month = value;
break;
}
case DAY_OF_MONTH: {
day = value;
break;
}
case HOUR: {
hour = (hour < 12) ? value : (value + 12);
break;
}
case HOUR_OF_DAY: {
hour = value;
break;
}
case AM_PM: {
if ((value == AM) && (hour > 11)) hour -= 12;
else if ((value == PM) && (hour < 12)) hour += 12;
break;
}
case MINUTE: {
minute = value;
break;
}
case SECOND: {
second = value;
break;
}
case DAY_OF_WEEK: {
computeTime();
if (value < getFirstDayOfWeek()) value += 7;
int dayOfWeek = get(DAY_OF_WEEK);
if (dayOfWeek < getFirstDayOfWeek()) dayOfWeek += 7;
day += (value - dayOfWeek);
computeTime();
break;
}
case DAY_OF_YEAR: {
computeTime();
int dayOfYear = get(DAY_OF_YEAR);
day += (value - dayOfYear);
computeTime();
break;
}
case WEEK_OF_YEAR: {
computeTime();
int currentWeekOfYear = get(WEEK_OF_YEAR);
add(WEEK_OF_YEAR, (value - currentWeekOfYear));
computeTime();
break;
}
}
}
public void add(int field, int value) {
switch (field) {
case YEAR: {
year += value;
break;
}
case MONTH: {
month += value;
break;
}
case DAY_OF_MONTH: {
day += value;
break;
}
case HOUR:
case HOUR_OF_DAY: {
hour += value;
break;
}
case MINUTE: {
minute += value;
break;
}
case SECOND: {
second += value;
break;
}
case DAY_OF_WEEK: {
day += value;
break;
}
case DAY_OF_YEAR: {
day += value;
break;
}
case WEEK_OF_YEAR: {
day += (value * 7);
break;
}
}
}
/**
* Calculate the number of days between two dates
*
* @param a Date
* @param b Date
* @return the difference in days between b and a (b - a)
*/
private int compareDate(Date a, Date b) {
final Date ta = new Date(a.getTime());
final Date tb = new Date(b.getTime());
final long d1 = setHourToZero(ta).getTime();
final long d2 = setHourToZero(tb).getTime();
return (int) Math.round((d2 - d1) / 1000.0 / 60.0 / 60.0 / 24.0);
}
/**
* Set hour, minutes, second and milliseconds to zero.
*
* @param d Date
* @return Modified date
*/
@SuppressWarnings("deprecation")
private Date setHourToZero(Date in) {
final Date d = new Date(in.getTime());
d.setHours(0);
d.setMinutes(0);
d.setSeconds(0);
// a trick to set milliseconds to zero
long t = d.getTime() / 1000;
t = t * 1000;
return new Date(t);
}
/**
* Gets the date of the first week for the specified year.
* @param year This is year - 1900 as returned by Date.getYear()
* @return
*/
@SuppressWarnings("deprecation")
private Date getWeekOne(int year) {
GregorianCalendar weekOne = new GregorianCalendar();
weekOne.setFirstDayOfWeek(getFirstDayOfWeek());
weekOne.setMinimalDaysInFirstWeek(getMinimalDaysInFirstWeek());
weekOne.setTime(new Date(year, 0, 1));
// can we use the week of 1/1/year as week one?
int dow = weekOne.get(DAY_OF_WEEK);
if (dow < weekOne.getFirstDayOfWeek()) dow += 7;
int eow = weekOne.getFirstDayOfWeek() + 7;
if ((eow - dow) < weekOne.getMinimalDaysInFirstWeek()) {
// nope, week one is the following week
weekOne.add(DATE, 7);
}
weekOne.set(DAY_OF_WEEK, weekOne.getFirstDayOfWeek());
return weekOne.getTime();
}
}
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