1 /* 2 ******************************************************************************* 3 * Copyright (C) 1996-2010, International Business Machines Corporation and * 4 * others. All Rights Reserved. * 5 ******************************************************************************* 6 */ 7 8 package com.ibm.icu.util; 9 10 import java.util.Date; 11 import java.util.Locale; 12 13 /** 14 * <code>TaiwanCalendar</code> is a subclass of <code>GregorianCalendar</code> 15 * that numbers years since 1912. 16 * <p> 17 * The Taiwan calendar is identical to the Gregorian calendar in all respects 18 * except for the year and era. Years are numbered since 1912 AD (Gregorian). 19 * <p> 20 * The Taiwan Calendar has one era: <code>MINGUO</code>. 21 * <p> 22 * This class should not be subclassed.</p> 23 * <p> 24 * TaiwanCalendar usually should be instantiated using 25 * {@link com.ibm.icu.util.Calendar#getInstance(ULocale)} passing in a <code>ULocale</code> 26 * with the tag <code>"@calendar=roc"</code>.</p> 27 * 28 * @see com.ibm.icu.util.Calendar 29 * @see com.ibm.icu.util.GregorianCalendar 30 * 31 * @author Laura Werner 32 * @author Alan Liu 33 * @author Steven R. Loomis 34 * @stable ICU 3.8 35 */ 36 public class TaiwanCalendar extends GregorianCalendar { 37 // jdk1.4.2 serialver 38 private static final long serialVersionUID = 2583005278132380631L; 39 40 //------------------------------------------------------------------------- 41 // Constructors... 42 //------------------------------------------------------------------------- 43 44 /** 45 * Constant for the Taiwan Era for years before Minguo 1. 46 * Brefore Minuo 1 is Gregorian 1911, Before Minguo 2 is Gregorian 1910 47 * and so on. 48 * 49 * @see com.ibm.icu.util.Calendar#ERA 50 * @stable ICU 3.8 51 */ 52 public static final int BEFORE_MINGUO = 0; 53 54 /** 55 * Constant for the Taiwan Era for Minguo. Minguo 1 is 1912 in 56 * Gregorian calendar. 57 * 58 * @see com.ibm.icu.util.Calendar#ERA 59 * @stable ICU 3.8 60 */ 61 public static final int MINGUO = 1; 62 63 /** 64 * Constructs a <code>TaiwanCalendar</code> using the current time 65 * in the default time zone with the default locale. 66 * @stable ICU 3.8 67 */ 68 public TaiwanCalendar() { 69 super(); 70 } 71 72 /** 73 * Constructs a <code>TaiwanCalendar</code> based on the current time 74 * in the given time zone with the default locale. 75 * 76 * @param zone the given time zone. 77 * @stable ICU 3.8 78 */ 79 public TaiwanCalendar(TimeZone zone) { 80 super(zone); 81 } 82 83 /** 84 * Constructs a <code>TaiwanCalendar</code> based on the current time 85 * in the default time zone with the given locale. 86 * 87 * @param aLocale the given locale. 88 * @stable ICU 3.8 89 */ 90 public TaiwanCalendar(Locale aLocale) { 91 super(aLocale); 92 } 93 94 /** 95 * Constructs a <code>TaiwanCalendar</code> based on the current time 96 * in the default time zone with the given locale. 97 * 98 * @param locale the given ulocale. 99 * @stable ICU 3.8 100 */ 101 public TaiwanCalendar(ULocale locale) { 102 super(locale); 103 } 104 105 /** 106 * Constructs a <code>TaiwanCalendar</code> based on the current time 107 * in the given time zone with the given locale. 108 * 109 * @param zone the given time zone. 110 * 111 * @stable ICU 3.8 112 */ 113 public TaiwanCalendar(TimeZone zone, Locale aLocale) { 114 super(zone, aLocale); 115 } 116 117 /** 118 * Constructs a <code>TaiwanCalendar</code> based on the current time 119 * in the given time zone with the given locale. 120 * 121 * @param zone the given time zone. 122 * @param locale the given ulocale. 123 * @stable ICU 3.8 124 */ 125 public TaiwanCalendar(TimeZone zone, ULocale locale) { 126 super(zone, locale); 127 } 128 129 /** 130 * Constructs a <code>TaiwanCalendar</code> with the given date set 131 * in the default time zone with the default locale. 132 * 133 * @param date The date to which the new calendar is set. 134 * @stable ICU 3.8 135 */ 136 public TaiwanCalendar(Date date) { 137 this(); 138 setTime(date); 139 } 140 141 /** 142 * Constructs a <code>TaiwanCalendar</code> with the given date set 143 * in the default time zone with the default locale. 144 * 145 * @param year The value used to set the calendar's {@link #YEAR YEAR} time field. 146 * 147 * @param month The value used to set the calendar's {@link #MONTH MONTH} time field. 148 * The value is 0-based. e.g., 0 for January. 149 * 150 * @param date The value used to set the calendar's {@link #DATE DATE} time field. 151 * @stable ICU 3.8 152 */ 153 public TaiwanCalendar(int year, int month, int date) { 154 super(year, month, date); 155 } 156 157 /** 158 * Constructs a TaiwanCalendar with the given date 159 * and time set for the default time zone with the default locale. 160 * 161 * @param year The value used to set the calendar's {@link #YEAR YEAR} time field. 162 * 163 * @param month The value used to set the calendar's {@link #MONTH MONTH} time field. 164 * The value is 0-based. e.g., 0 for January. 165 * @param date The value used to set the calendar's {@link #DATE DATE} time field. 166 * @param hour The value used to set the calendar's {@link #HOUR_OF_DAY HOUR_OF_DAY} time field. 167 * @param minute The value used to set the calendar's {@link #MINUTE MINUTE} time field. 168 * @param second The value used to set the calendar's {@link #SECOND SECOND} time field. 169 * @stable ICU 3.8 170 */ 171 public TaiwanCalendar(int year, int month, int date, int hour, 172 int minute, int second) 173 { 174 super(year, month, date, hour, minute, second); 175 } 176 177 178 //------------------------------------------------------------------------- 179 // The only practical difference from a Gregorian calendar is that years 180 // are numbered since 1912, inclusive. A couple of overrides will 181 // take care of that.... 182 //------------------------------------------------------------------------- 183 184 private static final int Taiwan_ERA_START = 1911; // 0=1911, 1=1912 185 186 // Use 1970 as the default value of EXTENDED_YEAR 187 private static final int GREGORIAN_EPOCH = 1970; 188 189 190 /** 191 * {@inheritDoc} 192 * @stable ICU 3.8 193 */ 194 protected int handleGetExtendedYear() { 195 // EXTENDED_YEAR in TaiwanCalendar is a Gregorian year 196 // The default value of EXTENDED_YEAR is 1970 (Minguo 59) 197 int year = GREGORIAN_EPOCH; 198 if (newerField(EXTENDED_YEAR, YEAR) == EXTENDED_YEAR 199 && newerField(EXTENDED_YEAR, ERA) == EXTENDED_YEAR) { 200 year = internalGet(EXTENDED_YEAR, GREGORIAN_EPOCH); 201 } else { 202 int era = internalGet(ERA, MINGUO); 203 if (era == MINGUO) { 204 year = internalGet(YEAR, 1) + Taiwan_ERA_START; 205 } else { 206 year = 1 - internalGet(YEAR, 1) + Taiwan_ERA_START; 207 } 208 } 209 return year; 210 } 211 212 /** 213 * {@inheritDoc} 214 * @stable ICU 3.8 215 */ 216 protected void handleComputeFields(int julianDay) { 217 super.handleComputeFields(julianDay); 218 int y = internalGet(EXTENDED_YEAR) - Taiwan_ERA_START; 219 if (y > 0) { 220 internalSet(ERA, MINGUO); 221 internalSet(YEAR, y); 222 } else { 223 internalSet(ERA, BEFORE_MINGUO); 224 internalSet(YEAR, 1- y); 225 } 226 } 227 228 /** 229 * Override GregorianCalendar. There is only one Taiwan ERA. We 230 * should really handle YEAR, YEAR_WOY, and EXTENDED_YEAR here too to 231 * implement the 1..5000000 range, but it's not critical. 232 * @stable ICU 3.8 233 */ 234 protected int handleGetLimit(int field, int limitType) { 235 if (field == ERA) { 236 if (limitType == MINIMUM || limitType == GREATEST_MINIMUM) { 237 return BEFORE_MINGUO; 238 } else { 239 return MINGUO; 240 } 241 } 242 return super.handleGetLimit(field, limitType); 243 } 244 245 /** 246 * {@inheritDoc} 247 * @stable ICU 3.8 248 */ 249 public String getType() { 250 return "roc"; 251 } 252 } 253
