com.ibm.icu.util.PersianCalendar Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of icu4j Show documentation
Show all versions of icu4j Show documentation
International Component for Unicode for Java (ICU4J) is a mature, widely used Java library
providing Unicode and Globalization support
/*
*******************************************************************************
* 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 = 365 * (year - 1) + floorDivide(8 * year + 21, 33);
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";
}
}