org.pojava.datetime.Shift Maven / Gradle / Ivy
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POJava DateTime is a simple, light-weight Java-based API for parsing and manipulating dates.
It parses dates from most languages and formats out of the box without having to specify which
format is expected. Defaults such as time zones, and whether to interpret an internationally
ambiguous date like "03/06/2014" as DMY order or MDY order are inferred by system time zone
and locale and stored in a default config object that can be replaced or overridden. Multiple
languages for month names are supported without any additional configuration needed.
This is a forked version edited by Jianlin
package org.pojava.datetime;
/**
* Shift describes an offset in time in terms of CalendarUnit increments of various proportions.
* Compare this to the "Duration" class, which describes fixed units of time in a self-contained
* manner. A Shift, by contrast, may use a 23, 24 or 25 hour day depending on Daylight Saving
* Time, or a 28, 29, 30, or 31 day month. The amount of time described by a Shift is dependent
* on a start time and a time zone, both external to the Shift object itself.
*
* @author John Pile
*/
public class Shift {
/**
* Nanoseconds per second
*/
private static final long NPS = 1000000000;
/**
* Seconds per Minute
*/
private static final long SPM = 60;
/**
* Minutes per Hour
*/
private static final long MPH = 60;
private int year = 0;
private int month = 0;
private int week = 0;
private int day = 0;
private int hour = 0;
private int minute = 0;
private int second = 0;
private long nanosec = 0;
public Shift() {
// default constructor
}
/**
* Constructor parsing from a string.
*
* @param iso8601 String representation of a duration.
*/
public Shift(String iso8601) {
char[] chars = iso8601.toCharArray();
double accum = 0.0;
double dec = 1.0;
int sign = 1;
int time = 0;
for (char c : chars) {
if (c == '.') {
dec /= 10;
} else if (c == '-') {
sign = -1;
} else if (c >= '0' && c <= '9') {
if (dec >= 1.0) {
accum = accum * 10 + sign * dec * (c - '0');
} else {
accum += sign * dec * (c - '0');
dec /= 10;
}
} else if (c == 'T') {
time = 1;
} else if (c == 'Y') {
if (accum != 0) {
shiftYears(accum);
accum = 0;
dec = 1.0;
sign = 1;
}
} else if (c == 'W') {
if (accum != 0) {
shiftWeeks(accum);
accum = 0;
dec = 1.0;
sign = 1;
}
} else if (c == 'D') {
if (accum != 0) {
shiftDays(accum);
accum = 0;
dec = 1.0;
sign = 1;
}
} else if (c == 'H') {
if (accum != 0) {
shiftHours(accum);
accum = 0;
dec = 1.0;
sign = 1;
}
} else if (c == 'M') {
if (accum != 0) {
if (time == 0) {
shiftMonths(accum);
} else {
shiftMinutes(accum);
}
accum = 0;
dec = 1.0;
sign = 1;
}
} else if (c == 'S') {
if (accum != 0) {
shiftSeconds(accum);
accum = 0;
dec = 1.0;
sign = 1;
}
}
}
}
/**
* Shift by number of years
*
* @param accum accum
*/
public void shiftYears(double accum) {
if (accum >= 1.0 || accum <= -1.0) {
year += (long) accum;
accum -= (long) accum;
}
if (accum != 0) {
shiftMonths(accum * 12);
}
}
/**
* Shift by whole number of months
*
* @param accum accum
*/
public void shiftMonths(double accum) {
if (accum >= 1.0 || accum <= -1.0) {
month += (long) accum;
accum -= (long) accum;
}
if (accum != 0) {
shiftDays(accum * 30);
}
}
/**
* Shift by whole number of weeks
*
* @param accum accum
*/
public void shiftWeeks(double accum) {
if (accum >= 1.0 || accum <= -1.0) {
week += (long) accum;
accum -= (long) accum;
}
if (accum != 0) {
shiftDays(accum * 7);
} else {
settleContents();
}
}
/**
* @param accum accum
*/
public void shiftDays(double accum) {
if (accum >= 1.0 || accum <= -1.0) {
day += (long) accum;
accum -= (long) accum;
}
if (accum != 0) {
shiftHours(accum * 24);
} else {
settleContents();
}
}
public void shiftHours(double accum) {
if (accum >= 1.0 || accum <= -1.0) {
hour += (long) accum;
accum -= (long) accum;
}
if (accum != 0) {
shiftMinutes(accum * MPH);
} else {
settleContents();
}
}
public void shiftMinutes(double accum) {
if (accum >= 1.0 || accum <= -1.0) {
minute += (long) accum;
accum -= (long) accum;
}
if (accum != 0) {
shiftSeconds(accum * SPM);
} else {
settleContents();
}
}
public void shiftSeconds(double accum) {
if (accum >= 1.0 || accum <= -1.0) {
second += (long) accum;
accum -= (long) accum;
}
if (accum != 0) {
accum += (accum < 0 ? -0.0000000005 : 0.0000000005);
nanosec += (long) (accum * 1000000000);
}
settleContents();
}
private void settleContents() {
if (nanosec >= NPS || nanosec <= -NPS) {
long calcsec = nanosec / NPS;
second += calcsec;
nanosec -= calcsec * NPS;
}
if (second >= SPM || second <= -SPM) {
long calcmin = second / SPM;
minute += calcmin;
second -= calcmin * SPM;
}
if (minute >= MPH || minute <= -MPH) {
long calchour = minute / MPH;
hour += calchour;
minute -= calchour * MPH;
}
while (day < 0 && week > 0) {
week--;
day += 7;
}
while (minute < 0 && hour > 0) {
hour--;
minute += 60;
}
while (second < 0 && minute > 0) {
minute--;
second += 60;
}
while (nanosec < 0 && second > 0) {
second--;
nanosec += 1000000000;
}
}
public String toString() {
// See ISO 8601
settleContents();
StringBuilder sb = new StringBuilder();
sb.append('P');
if (year != 0) {
sb.append(year);
sb.append('Y');
}
if (month != 0) {
sb.append(month);
sb.append('M');
}
if (week != 0) {
sb.append(week);
sb.append('W');
}
if (day != 0) {
sb.append(day);
sb.append('D');
}
if (hour != 0 || minute != 0 || second != 0 || nanosec != 0) {
sb.append('T');
if (hour != 0) {
sb.append(hour);
sb.append('H');
}
if (minute != 0) {
sb.append(minute);
sb.append('M');
}
if (second != 0 || nanosec != 0) {
if (nanosec == 0) {
sb.append(second);
} else {
sb.append((double) (second + nanosec / 1000000000.0));
}
sb.append('S');
}
}
return sb.toString();
}
public int getYear() {
return year;
}
public void setYear(int year) {
this.year = year;
}
public int getMonth() {
return month;
}
public void setMonth(int month) {
this.month = month;
}
public int getWeek() {
return week;
}
public void setWeek(int week) {
this.week = week;
}
public int getDay() {
return day;
}
public void setDay(int day) {
this.day = day;
}
public int getHour() {
return hour;
}
public void setHour(int hour) {
this.hour = hour;
}
public int getMinute() {
return minute;
}
public void setMinute(int minute) {
this.minute = minute;
settleContents();
}
public int getSecond() {
return second;
}
public void setSecond(int second) {
this.second = second;
settleContents();
}
public int getNanosec() {
return (int) nanosec;
}
public void setNanosec(int nanosec) {
this.nanosec = nanosec;
settleContents();
}
public void setNanosec(long nanosec) {
this.nanosec = nanosec;
settleContents();
}
}