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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) 1996-2010, International Business Machines Corporation and *
* others. All Rights Reserved. *
*******************************************************************************
*/
package com.ibm.icu.util;
import java.util.Date;
import java.util.Locale;
/**
* TaiwanCalendar is a subclass of GregorianCalendar
* that numbers years since 1912.
*
* The Taiwan calendar is identical to the Gregorian calendar in all respects
* except for the year and era. Years are numbered since 1912 AD (Gregorian).
*
* The Taiwan Calendar has one era: MINGUO.
*
* This class should not be subclassed.
*
* TaiwanCalendar usually should be instantiated using
* {@link com.ibm.icu.util.Calendar#getInstance(ULocale)} passing in a ULocale
* with the tag "@calendar=roc".
*
* @see com.ibm.icu.util.Calendar
* @see com.ibm.icu.util.GregorianCalendar
*
* @author Laura Werner
* @author Alan Liu
* @author Steven R. Loomis
* @stable ICU 3.8
*/
public class TaiwanCalendar extends GregorianCalendar {
// jdk1.4.2 serialver
private static final long serialVersionUID = 2583005278132380631L;
//-------------------------------------------------------------------------
// Constructors...
//-------------------------------------------------------------------------
/**
* Constant for the Taiwan Era for years before Minguo 1.
* Brefore Minuo 1 is Gregorian 1911, Before Minguo 2 is Gregorian 1910
* and so on.
*
* @see com.ibm.icu.util.Calendar#ERA
* @stable ICU 3.8
*/
public static final int BEFORE_MINGUO = 0;
/**
* Constant for the Taiwan Era for Minguo. Minguo 1 is 1912 in
* Gregorian calendar.
*
* @see com.ibm.icu.util.Calendar#ERA
* @stable ICU 3.8
*/
public static final int MINGUO = 1;
/**
* Constructs a TaiwanCalendar using the current time
* in the default time zone with the default locale.
* @stable ICU 3.8
*/
public TaiwanCalendar() {
super();
}
/**
* Constructs a TaiwanCalendar based on the current time
* in the given time zone with the default locale.
*
* @param zone the given time zone.
* @stable ICU 3.8
*/
public TaiwanCalendar(TimeZone zone) {
super(zone);
}
/**
* Constructs a TaiwanCalendar based on the current time
* in the default time zone with the given locale.
*
* @param aLocale the given locale.
* @stable ICU 3.8
*/
public TaiwanCalendar(Locale aLocale) {
super(aLocale);
}
/**
* Constructs a TaiwanCalendar based on the current time
* in the default time zone with the given locale.
*
* @param locale the given ulocale.
* @stable ICU 3.8
*/
public TaiwanCalendar(ULocale locale) {
super(locale);
}
/**
* Constructs a TaiwanCalendar based on the current time
* in the given time zone with the given locale.
*
* @param zone the given time zone.
*
* @stable ICU 3.8
*/
public TaiwanCalendar(TimeZone zone, Locale aLocale) {
super(zone, aLocale);
}
/**
* Constructs a TaiwanCalendar 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.
* @stable ICU 3.8
*/
public TaiwanCalendar(TimeZone zone, ULocale locale) {
super(zone, locale);
}
/**
* Constructs a TaiwanCalendar with the given date set
* in the default time zone with the default locale.
*
* @param date The date to which the new calendar is set.
* @stable ICU 3.8
*/
public TaiwanCalendar(Date date) {
this();
setTime(date);
}
/**
* Constructs a TaiwanCalendar with the given date set
* in the default time zone with the default locale.
*
* @param year The value used to set the calendar's {@link #YEAR YEAR} time field.
*
* @param month The value used to set the calendar's {@link #MONTH MONTH} time field.
* The value is 0-based. e.g., 0 for January.
*
* @param date The value used to set the calendar's {@link #DATE DATE} time field.
* @stable ICU 3.8
*/
public TaiwanCalendar(int year, int month, int date) {
super(year, month, date);
}
/**
* Constructs a TaiwanCalendar with the given date
* and time set for the default time zone with the default locale.
*
* @param year The value used to set the calendar's {@link #YEAR YEAR} time field.
*
* @param month The value used to set the calendar's {@link #MONTH MONTH} time field.
* The value is 0-based. e.g., 0 for January.
* @param date The value used to set the calendar's {@link #DATE DATE} time field.
* @param hour The value used to set the calendar's {@link #HOUR_OF_DAY HOUR_OF_DAY} time field.
* @param minute The value used to set the calendar's {@link #MINUTE MINUTE} time field.
* @param second The value used to set the calendar's {@link #SECOND SECOND} time field.
* @stable ICU 3.8
*/
public TaiwanCalendar(int year, int month, int date, int hour,
int minute, int second)
{
super(year, month, date, hour, minute, second);
}
//-------------------------------------------------------------------------
// The only practical difference from a Gregorian calendar is that years
// are numbered since 1912, inclusive. A couple of overrides will
// take care of that....
//-------------------------------------------------------------------------
private static final int Taiwan_ERA_START = 1911; // 0=1911, 1=1912
// Use 1970 as the default value of EXTENDED_YEAR
private static final int GREGORIAN_EPOCH = 1970;
/**
* {@inheritDoc}
* @stable ICU 3.8
*/
protected int handleGetExtendedYear() {
// EXTENDED_YEAR in TaiwanCalendar is a Gregorian year
// The default value of EXTENDED_YEAR is 1970 (Minguo 59)
int year = GREGORIAN_EPOCH;
if (newerField(EXTENDED_YEAR, YEAR) == EXTENDED_YEAR
&& newerField(EXTENDED_YEAR, ERA) == EXTENDED_YEAR) {
year = internalGet(EXTENDED_YEAR, GREGORIAN_EPOCH);
} else {
int era = internalGet(ERA, MINGUO);
if (era == MINGUO) {
year = internalGet(YEAR, 1) + Taiwan_ERA_START;
} else {
year = 1 - internalGet(YEAR, 1) + Taiwan_ERA_START;
}
}
return year;
}
/**
* {@inheritDoc}
* @stable ICU 3.8
*/
protected void handleComputeFields(int julianDay) {
super.handleComputeFields(julianDay);
int y = internalGet(EXTENDED_YEAR) - Taiwan_ERA_START;
if (y > 0) {
internalSet(ERA, MINGUO);
internalSet(YEAR, y);
} else {
internalSet(ERA, BEFORE_MINGUO);
internalSet(YEAR, 1- y);
}
}
/**
* Override GregorianCalendar. There is only one Taiwan ERA. We
* should really handle YEAR, YEAR_WOY, and EXTENDED_YEAR here too to
* implement the 1..5000000 range, but it's not critical.
* @stable ICU 3.8
*/
protected int handleGetLimit(int field, int limitType) {
if (field == ERA) {
if (limitType == MINIMUM || limitType == GREATEST_MINIMUM) {
return BEFORE_MINGUO;
} else {
return MINGUO;
}
}
return super.handleGetLimit(field, limitType);
}
/**
* {@inheritDoc}
* @stable ICU 3.8
*/
public String getType() {
return "roc";
}
}