icuSources/i18n/ethpccal.cpp

   1 /*
   2 *******************************************************************************
   3 * Copyright (C) 2003 - 2008, International Business Machines Corporation and  *
   4 * others. All Rights Reserved.                                                *
   5 *******************************************************************************
   6 */
   7
   8 #include "unicode/utypes.h"
   9
  10 #if !UCONFIG_NO_FORMATTING
  11
  12 #include "umutex.h"
  13 #include "ethpccal.h"
  14 #include "cecal.h"
  15 #include <float.h>
  16
  17 U_NAMESPACE_BEGIN
  18
  19 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(EthiopicCalendar)
  20
  21 //static const int32_t JD_EPOCH_OFFSET_AMETE_ALEM = -285019;
  22 static const int32_t JD_EPOCH_OFFSET_AMETE_MIHRET = 1723856;
  23 static const int32_t AMETE_MIHRET_DELTA = 5500; // 5501 - 1 (Amete Alem 5501 = Amete Mihret 1)
  24
  25 //-------------------------------------------------------------------------
  26 // Constructors...
  27 //-------------------------------------------------------------------------
  28
  29 EthiopicCalendar::EthiopicCalendar(const Locale& aLocale,
  30                                    UErrorCode& success,
  31                                    EEraType type /*= AMETE_MIHRET_ERA*/)
  32 :   CECalendar(aLocale, success),
  33     eraType(type)
  34 {
  35 }
  36
  37 EthiopicCalendar::EthiopicCalendar(const EthiopicCalendar& other)
  38 :   CECalendar(other),
  39     eraType(other.eraType)
  40 {
  41 }
  42
  43 EthiopicCalendar::~EthiopicCalendar()
  44 {
  45 }
  46
  47 Calendar*
  48 EthiopicCalendar::clone() const
  49 {
  50     return new EthiopicCalendar(*this);
  51 }
  52
  53 const char *
  54 EthiopicCalendar::getType() const
  55 {
  56     if (isAmeteAlemEra()) {
  57         return "ethiopic-amete-alem";
  58     }
  59     return "ethiopic";
  60 }
  61
  62 void
  63 EthiopicCalendar::setAmeteAlemEra(UBool onOff)
  64 {
  65     eraType = onOff ? AMETE_ALEM_ERA : AMETE_MIHRET_ERA;
  66 }
  67
  68 UBool
  69 EthiopicCalendar::isAmeteAlemEra() const
  70 {
  71     return (eraType == AMETE_ALEM_ERA);
  72 }
  73
  74 //-------------------------------------------------------------------------
  75 // Calendar framework
  76 //-------------------------------------------------------------------------
  77
  78 int32_t
  79 EthiopicCalendar::handleGetExtendedYear()
  80 {
  81     // Ethiopic calendar uses EXTENDED_YEAR aligned to
  82     // Amelete Hihret year always.
  83     int32_t eyear;
  84     if (newerField(UCAL_EXTENDED_YEAR, UCAL_YEAR) == UCAL_EXTENDED_YEAR) {
  85         eyear = internalGet(UCAL_EXTENDED_YEAR, 1); // Default to year 1
  86     } else if (isAmeteAlemEra()) {
  87         eyear = internalGet(UCAL_YEAR, 1 + AMETE_MIHRET_DELTA)
  88             - AMETE_MIHRET_DELTA; // Default to year 1 of Amelete Mihret
  89     } else {
  90         // The year defaults to the epoch start, the era to AMETE_MIHRET
  91         int32_t era = internalGet(UCAL_ERA, AMETE_MIHRET);
  92         if (era == AMETE_MIHRET) {
  93             eyear = internalGet(UCAL_YEAR, 1); // Default to year 1
  94         } else {
  95             eyear = internalGet(UCAL_YEAR, 1) - AMETE_MIHRET_DELTA;
  96         }
  97     }
  98     return eyear;
  99 }
 100
 101 void
 102 EthiopicCalendar::handleComputeFields(int32_t julianDay, UErrorCode &status)
 103 {
 104     int32_t eyear, month, day, era, year;
 105     jdToCE(julianDay, getJDEpochOffset(), eyear, month, day);
 106
 107     if (isAmeteAlemEra()) {
 108         era = AMETE_ALEM;
 109         year = eyear + AMETE_MIHRET_DELTA;
 110     } else {
 111         if (eyear > 0) {
 112             era = AMETE_MIHRET;
 113             year = eyear;
 114         } else {
 115             era = AMETE_ALEM;
 116             year = eyear + AMETE_MIHRET_DELTA;
 117         }
 118     }
 119
 120     internalSet(UCAL_EXTENDED_YEAR, eyear);
 121     internalSet(UCAL_ERA, era);
 122     internalSet(UCAL_YEAR, year);
 123     internalSet(UCAL_MONTH, month);
 124     internalSet(UCAL_DATE, day);
 125     internalSet(UCAL_DAY_OF_YEAR, (30 * month) + day);
 126 }
 127
 128 int32_t
 129 EthiopicCalendar::handleGetLimit(UCalendarDateFields field, ELimitType limitType) const
 130 {
 131     if (isAmeteAlemEra() && field == UCAL_ERA) {
 132         return 0; // Only one era in this mode, era is always 0
 133     }
 134     return CECalendar::handleGetLimit(field, limitType);
 135 }
 136
 137 const UDate     EthiopicCalendar::fgSystemDefaultCentury        = DBL_MIN;
 138 const int32_t   EthiopicCalendar::fgSystemDefaultCenturyYear    = -1;
 139
 140 UDate           EthiopicCalendar::fgSystemDefaultCenturyStart       = DBL_MIN;
 141 int32_t         EthiopicCalendar::fgSystemDefaultCenturyStartYear   = -1;
 142
 143 UDate
 144 EthiopicCalendar::defaultCenturyStart() const
 145 {
 146     initializeSystemDefaultCentury();
 147     return fgSystemDefaultCenturyStart;
 148 }
 149
 150 int32_t
 151 EthiopicCalendar::defaultCenturyStartYear() const
 152 {
 153     initializeSystemDefaultCentury();
 154     if (isAmeteAlemEra()) {
 155         return fgSystemDefaultCenturyStartYear + AMETE_MIHRET_DELTA;
 156     }
 157     return fgSystemDefaultCenturyStartYear;
 158 }
 159
 160 void
 161 EthiopicCalendar::initializeSystemDefaultCentury()
 162 {
 163     // lazy-evaluate systemDefaultCenturyStart
 164     UBool needsUpdate;
 165     UMTX_CHECK(NULL, (fgSystemDefaultCenturyStart == fgSystemDefaultCentury), needsUpdate);
 166
 167     if (!needsUpdate) {
 168         return;
 169     }
 170
 171     UErrorCode status = U_ZERO_ERROR;
 172
 173     EthiopicCalendar calendar(Locale("@calendar=ethiopic"), status);
 174     if (U_SUCCESS(status)) {
 175         calendar.setTime(Calendar::getNow(), status);
 176         calendar.add(UCAL_YEAR, -80, status);
 177         UDate    newStart = calendar.getTime(status);
 178         int32_t  newYear  = calendar.get(UCAL_YEAR, status);
 179         {
 180             umtx_lock(NULL);
 181             fgSystemDefaultCenturyStart = newStart;
 182             fgSystemDefaultCenturyStartYear = newYear;
 183             umtx_unlock(NULL);
 184         }
 185     }
 186     // We have no recourse upon failure unless we want to propagate the failure
 187     // out.
 188 }
 189
 190 int32_t
 191 EthiopicCalendar::getJDEpochOffset() const
 192 {
 193     return JD_EPOCH_OFFSET_AMETE_MIHRET;
 194 }
 195
 196
 197 #if 0
 198 // We do not want to introduce this API in ICU4C.
 199 // It was accidentally introduced in ICU4J as a public API.
 200
 201 //-------------------------------------------------------------------------
 202 // Calendar system Conversion methods...
 203 //-------------------------------------------------------------------------
 204
 205 int32_t
 206 EthiopicCalendar::ethiopicToJD(int32_t year, int32_t month, int32_t date)
 207 {
 208     return ceToJD(year, month, date, JD_EPOCH_OFFSET_AMETE_MIHRET);
 209 }
 210 #endif
 211
 212 U_NAMESPACE_END
 213
 214 #endif