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With inspiration from other libraries
// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html#License
/*
*******************************************************************************
* Copyright (C) 1996-2014, International Business Machines Corporation and *
* others. All Rights Reserved. *
*******************************************************************************
*/
package com.ibm.icu.util;
import java.util.Date;
import java.util.Locale;
import com.ibm.icu.util.ULocale.Category;
/**
* PersianCalendar is a subclass of Calendar that
* that implements the Persian calendar. It is used as the main civil
* calendar in Iran and Afghanistan, and by Iranians and Afghans worldwide.
*
* The Persian calendar is solar, and is similar to the Gregorian calendar
* in various ways, except its leap year rule, which is determined
* astronomically. The Persian year starts around the March equinox.
*
* The modern Persian calendar (used in Iran since 1925 CE and in
* Afghanistan since 1957 CE), has the lengths of the months fixed. The
* first six months are 31 days each, the next five months are 30 days each,
* and the final month is 29 days in non-leap years and 30 days in leap
* ones. Historically, the lengths of the month differed in different
* years, but they were finally fixed at the times mentioned above. Partial
* information is available about the historical lengths.
*
* The official rule for determination of the beginning of the Persian year
* is locale dependent, but at the same time, it has not specified a locale.
* Iranians around the world traditionally follow the calendar authorities
* of Iran, which haven't officially specified the locale. Some
* calendarists use some point in Tehran as the locale, while others have
* tried the more neutral 52.5 degrees east meridian. It is not clear which
* locale should be used for the Persian calendar of Afghanistan, but it is
* expected that for about one year in every twenty-four years, the Afghan
* calendar may become different from the Iranian one.
*
* The exact locale to be used for the Iranian calendar starts to make a
* difference at around 2090 CE. The specific arithmetic method implemented
* here, commonly known as the 33-year cycle rule, matches the astronomical
* calendar at least for the whole period that the calendar has been both
* well-defined and official, from 1925 to around 2090 CE. The other
* commonly known algorithm, the 2820-year cycle, has been incorrectly
* designed to follow the tropical year instead of the spring equinoctial
* year, and fails to match the astronomical one as early as 2025 CE.
*
* This class should not be subclassed.
*
* PersianCalendar usually should be instantiated using
* {@link com.ibm.icu.util.Calendar#getInstance(ULocale)} passing in a
* ULocale with the tag "@calendar=persian".
*
* @see com.ibm.icu.util.GregorianCalendar
* @see com.ibm.icu.util.Calendar
*
* @author Roozbeh Pournader
*
* @internal
* @deprecated This API is ICU internal only.
*/
@Deprecated
public class PersianCalendar extends Calendar {
private static final long serialVersionUID = -6727306982975111643L;
//-------------------------------------------------------------------------
// Constants...
//-------------------------------------------------------------------------
private static final int[][] MONTH_COUNT = {
//len len2 st
{ 31, 31, 0 }, // Farvardin
{ 31, 31, 31 }, // Ordibehesht
{ 31, 31, 62 }, // Khordad
{ 31, 31, 93 }, // Tir
{ 31, 31, 124 }, // Mordad
{ 31, 31, 155 }, // Shahrivar
{ 30, 30, 186 }, // Mehr
{ 30, 30, 216 }, // Aban
{ 30, 30, 246 }, // Azar
{ 30, 30, 276 }, // Dey
{ 30, 30, 306 }, // Bahman
{ 29, 30, 336 } // Esfand
// len length of month
// len2 length of month in a leap year
// st days in year before start of month
};
private static final int PERSIAN_EPOCH = 1948320;
//-------------------------------------------------------------------------
// Constructors...
//-------------------------------------------------------------------------
/**
* Constructs a default PersianCalendar using the current time
* in the default time zone with the default FORMAT locale.
* @see Category#FORMAT
*
* @internal
* @deprecated This API is ICU internal only.
*/
@Deprecated
public PersianCalendar()
{
this(TimeZone.getDefault(), ULocale.getDefault(Category.FORMAT));
}
/**
* Constructs a PersianCalendar based on the current time
* in the given time zone with the default FORMAT locale.
* @param zone the given time zone.
* @see Category#FORMAT
*
* @internal
* @deprecated This API is ICU internal only.
*/
@Deprecated
public PersianCalendar(TimeZone zone)
{
this(zone, ULocale.getDefault(Category.FORMAT));
}
/**
* Constructs a PersianCalendar based on the current time
* in the default time zone with the given locale.
*
* @param aLocale the given locale.
*
* @internal
* @deprecated This API is ICU internal only.
*/
@Deprecated
public PersianCalendar(Locale aLocale)
{
this(TimeZone.getDefault(), aLocale);
}
/**
* Constructs a PersianCalendar based on the current time
* in the default time zone with the given locale.
*
* @param locale the given ulocale.
*
* @internal
* @deprecated This API is ICU internal only.
*/
@Deprecated
public PersianCalendar(ULocale locale)
{
this(TimeZone.getDefault(), locale);
}
/**
* Constructs a PersianCalendar based on the current time
* in the given time zone with the given locale.
*
* @param zone the given time zone.
* @param aLocale the given locale.
*
* @internal
* @deprecated This API is ICU internal only.
*/
@Deprecated
public PersianCalendar(TimeZone zone, Locale aLocale)
{
super(zone, aLocale);
setTimeInMillis(System.currentTimeMillis());
}
/**
* Constructs a PersianCalendar based on the current time
* in the given time zone with the given locale.
*
* @param zone the given time zone.
* @param locale the given ulocale.
*
* @internal
* @deprecated This API is ICU internal only.
*/
@Deprecated
public PersianCalendar(TimeZone zone, ULocale locale)
{
super(zone, locale);
setTimeInMillis(System.currentTimeMillis());
}
/**
* Constructs a PersianCalendar with the given date set
* in the default time zone with the default FORMAT locale.
*
* @param date The date to which the new calendar is set.
* @see Category#FORMAT
*
* @internal
* @deprecated This API is ICU internal only.
*/
@Deprecated
public PersianCalendar(Date date) {
super(TimeZone.getDefault(), ULocale.getDefault(Category.FORMAT));
this.setTime(date);
}
/**
* Constructs a PersianCalendar with the given date set
* in the default time zone with the default FORMAT locale.
*
* @param year the value used to set the {@link #YEAR YEAR} time field in the calendar.
* @param month the value used to set the {@link #MONTH MONTH} time field in the calendar.
* Note that the month value is 0-based. e.g., 0 for Farvardin.
* @param date the value used to set the {@link #DATE DATE} time field in the calendar.
* @see Category#FORMAT
*
* @internal
* @deprecated This API is ICU internal only.
*/
@Deprecated
public PersianCalendar(int year, int month, int date)
{
super(TimeZone.getDefault(), ULocale.getDefault(Category.FORMAT));
this.set(Calendar.YEAR, year);
this.set(Calendar.MONTH, month);
this.set(Calendar.DATE, date);
}
/**
* Constructs a PersianCalendar with the given date
* and time set for the default time zone with the default FORMAT locale.
*
* @param year the value used to set the {@link #YEAR YEAR} time field in the calendar.
* @param month the value used to set the {@link #MONTH MONTH} time field in the calendar.
* Note that the month value is 0-based. e.g., 0 for Farvardin.
* @param date the value used to set the {@link #DATE DATE} time field in the calendar.
* @param hour the value used to set the {@link #HOUR_OF_DAY HOUR_OF_DAY} time field
* in the calendar.
* @param minute the value used to set the {@link #MINUTE MINUTE} time field
* in the calendar.
* @param second the value used to set the {@link #SECOND SECOND} time field
* in the calendar.
* @see Category#FORMAT
*
* @internal
* @deprecated This API is ICU internal only.
*/
@Deprecated
public PersianCalendar(int year, int month, int date, int hour,
int minute, int second)
{
super(TimeZone.getDefault(), ULocale.getDefault(Category.FORMAT));
this.set(Calendar.YEAR, year);
this.set(Calendar.MONTH, month);
this.set(Calendar.DATE, date);
this.set(Calendar.HOUR_OF_DAY, hour);
this.set(Calendar.MINUTE, minute);
this.set(Calendar.SECOND, second);
}
//-------------------------------------------------------------------------
// Minimum / Maximum access functions
//-------------------------------------------------------------------------
private static final int LIMITS[][] = {
// Minimum Greatest Least Maximum
// Minimum Maximum
{ 0, 0, 0, 0}, // ERA
{ -5000000, -5000000, 5000000, 5000000}, // YEAR
{ 0, 0, 11, 11}, // MONTH
{ 1, 1, 52, 53}, // WEEK_OF_YEAR
{/* */}, // WEEK_OF_MONTH
{ 1, 1, 29, 31}, // DAY_OF_MONTH
{ 1, 1, 365, 366}, // DAY_OF_YEAR
{/* */}, // DAY_OF_WEEK
{ -1, -1, 5, 5}, // DAY_OF_WEEK_IN_MONTH
{/* */}, // AM_PM
{/* */}, // HOUR
{/* */}, // HOUR_OF_DAY
{/* */}, // MINUTE
{/* */}, // SECOND
{/* */}, // MILLISECOND
{/* */}, // ZONE_OFFSET
{/* */}, // DST_OFFSET
{ -5000000, -5000000, 5000000, 5000000}, // YEAR_WOY
{/* */}, // DOW_LOCAL
{ -5000000, -5000000, 5000000, 5000000}, // EXTENDED_YEAR
{/* */}, // JULIAN_DAY
{/* */}, // MILLISECONDS_IN_DAY
};
/**
* @internal
* @deprecated This API is ICU internal only.
*/
@Deprecated
protected int handleGetLimit(int field, int limitType) {
return LIMITS[field][limitType];
}
//-------------------------------------------------------------------------
// Assorted calculation utilities
//
/**
* Determine whether a year is a leap year in the Persian calendar
*/
private final static boolean isLeapYear(int year)
{
int[] remainder = new int[1];
floorDivide(25 * year + 11, 33, remainder);
return remainder[0] < 8;
}
//----------------------------------------------------------------------
// Calendar framework
//----------------------------------------------------------------------
/**
* Return the length (in days) of the given month.
*
* @param extendedYear The Persian year
* @param month The Persian month, 0-based
*
* @internal
* @deprecated This API is ICU internal only.
*/
@Deprecated
protected int handleGetMonthLength(int extendedYear, int month) {
// If the month is out of range, adjust it into range, and
// modify the extended year value accordingly.
if (month < 0 || month > 11) {
int[] rem = new int[1];
extendedYear += floorDivide(month, 12, rem);
month = rem[0];
}
return MONTH_COUNT[month][isLeapYear(extendedYear)?1:0];
}
/**
* Return the number of days in the given Persian year
*
* @internal
* @deprecated This API is ICU internal only.
*/
@Deprecated
protected int handleGetYearLength(int extendedYear) {
return isLeapYear(extendedYear) ? 366 : 365;
}
//-------------------------------------------------------------------------
// Functions for converting from field values to milliseconds....
//-------------------------------------------------------------------------
/**
* Return JD of start of given month/year
*
* @internal
* @deprecated This API is ICU internal only.
*/
@Deprecated
protected int handleComputeMonthStart(int eyear, int month, boolean useMonth) {
// If the month is out of range, adjust it into range, and
// modify the extended year value accordingly.
if (month < 0 || month > 11) {
int[] rem = new int[1];
eyear += floorDivide(month, 12, rem);
month = rem[0];
}
int julianDay = PERSIAN_EPOCH - 1 + 365 * (eyear - 1) + floorDivide(8 * eyear + 21, 33);
if (month != 0) {
julianDay += MONTH_COUNT[month][2];
}
return julianDay;
}
//-------------------------------------------------------------------------
// Functions for converting from milliseconds to field values
//-------------------------------------------------------------------------
/**
* @internal
* @deprecated This API is ICU internal only.
*/
@Deprecated
protected int handleGetExtendedYear() {
int year;
if (newerField(EXTENDED_YEAR, YEAR) == EXTENDED_YEAR) {
year = internalGet(EXTENDED_YEAR, 1); // Default to year 1
} else {
year = internalGet(YEAR, 1); // Default to year 1
}
return year;
}
/**
* Override Calendar to compute several fields specific to the Persian
* calendar system. These are:
*
* - ERA
*
- YEAR
*
- MONTH
*
- DAY_OF_MONTH
*
- DAY_OF_YEAR
*
- EXTENDED_YEAR
*
* The DAY_OF_WEEK and DOW_LOCAL fields are already set when this
* method is called.
*
* @internal
* @deprecated This API is ICU internal only.
*/
@Deprecated
protected void handleComputeFields(int julianDay) {
int year, month, dayOfMonth, dayOfYear;
long daysSinceEpoch = julianDay - PERSIAN_EPOCH;
year = 1 + (int) floorDivide(33 * daysSinceEpoch + 3, 12053);
long farvardin1 = 365L * (year - 1L) + floorDivide(8L * year + 21, 33L);
dayOfYear = (int)(daysSinceEpoch - farvardin1); // 0-based
if (dayOfYear < 216) { // Compute 0-based month
month = dayOfYear / 31;
} else {
month = (dayOfYear - 6) / 30;
}
dayOfMonth = dayOfYear - MONTH_COUNT[month][2] + 1;
++dayOfYear; // Make it 1-based now
internalSet(ERA, 0);
internalSet(YEAR, year);
internalSet(EXTENDED_YEAR, year);
internalSet(MONTH, month);
internalSet(DAY_OF_MONTH, dayOfMonth);
internalSet(DAY_OF_YEAR, dayOfYear);
}
/**
* {@inheritDoc}
*
* @internal
* @deprecated This API is ICU internal only.
*/
@Deprecated
public String getType() {
return "persian";
}
}