icuSources/i18n/taiwncal.cpp

   1 // © 2016 and later: Unicode, Inc. and others.
   2 // License & terms of use: http://www.unicode.org/copyright.html
   3 /*
   4  *******************************************************************************
   5  * Copyright (C) 2003-2013, International Business Machines Corporation and
   6  * others. All Rights Reserved.
   7  *******************************************************************************
   8  *
   9  * File TAIWNCAL.CPP
  10  *
  11  * Modification History:
  12  *  05/13/2003    srl     copied from gregocal.cpp
  13  *  06/29/2007    srl     copied from buddhcal.cpp
  14  *  05/12/2008    jce     modified to use calendar=roc per CLDR
  15  *
  16  */
  17
  18 #include "unicode/utypes.h"
  19
  20 #if !UCONFIG_NO_FORMATTING
  21
  22 #include "taiwncal.h"
  23 #include "unicode/gregocal.h"
  24 #include "umutex.h"
  25 #include <float.h>
  26
  27 U_NAMESPACE_BEGIN
  28
  29 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(TaiwanCalendar)
  30
  31 static const int32_t kTaiwanEraStart = 1911;  // 1911 (Gregorian)
  32
  33 static const int32_t kGregorianEpoch = 1970;
  34
  35 TaiwanCalendar::TaiwanCalendar(const Locale& aLocale, UErrorCode& success)
  36 :   GregorianCalendar(aLocale, success)
  37 {
  38     setTimeInMillis(getNow(), success); // Call this again now that the vtable is set up properly.
  39 }
  40
  41 TaiwanCalendar::~TaiwanCalendar()
  42 {
  43 }
  44
  45 TaiwanCalendar::TaiwanCalendar(const TaiwanCalendar& source)
  46 : GregorianCalendar(source)
  47 {
  48 }
  49
  50 TaiwanCalendar& TaiwanCalendar::operator= ( const TaiwanCalendar& right)
  51 {
  52     GregorianCalendar::operator=(right);
  53     return *this;
  54 }
  55
  56 Calendar* TaiwanCalendar::clone(void) const
  57 {
  58     return new TaiwanCalendar(*this);
  59 }
  60
  61 const char *TaiwanCalendar::getType() const
  62 {
  63     return "roc";
  64 }
  65
  66 int32_t TaiwanCalendar::handleGetExtendedYear()
  67 {
  68     // EXTENDED_YEAR in TaiwanCalendar is a Gregorian year
  69     // The default value of EXTENDED_YEAR is 1970 (Minguo 59)
  70     int32_t year = kGregorianEpoch;
  71
  72     if (newerField(UCAL_EXTENDED_YEAR, UCAL_YEAR) == UCAL_EXTENDED_YEAR
  73         && newerField(UCAL_EXTENDED_YEAR, UCAL_ERA) == UCAL_EXTENDED_YEAR) {
  74         year = internalGet(UCAL_EXTENDED_YEAR, kGregorianEpoch);
  75     } else {
  76         int32_t era = internalGet(UCAL_ERA, MINGUO);
  77         if(era == MINGUO) {
  78             year =     internalGet(UCAL_YEAR, 1) + kTaiwanEraStart;
  79         } else if(era == BEFORE_MINGUO) {
  80             year = 1 - internalGet(UCAL_YEAR, 1) + kTaiwanEraStart;
  81         }
  82     }
  83     return year;
  84 }
  85
  86 void TaiwanCalendar::handleComputeFields(int32_t julianDay, UErrorCode& status)
  87 {
  88     GregorianCalendar::handleComputeFields(julianDay, status);
  89     int32_t y = internalGet(UCAL_EXTENDED_YEAR) - kTaiwanEraStart;
  90     if(y>0) {
  91         internalSet(UCAL_ERA, MINGUO);
  92         internalSet(UCAL_YEAR, y);
  93     } else {
  94         internalSet(UCAL_ERA, BEFORE_MINGUO);
  95         internalSet(UCAL_YEAR, 1-y);
  96     }
  97 }
  98
  99 int32_t TaiwanCalendar::handleGetLimit(UCalendarDateFields field, ELimitType limitType) const
 100 {
 101     if(field == UCAL_ERA) {
 102         if(limitType == UCAL_LIMIT_MINIMUM || limitType == UCAL_LIMIT_GREATEST_MINIMUM) {
 103             return BEFORE_MINGUO;
 104         } else {
 105             return MINGUO;
 106         }
 107     } else {
 108         return GregorianCalendar::handleGetLimit(field,limitType);
 109     }
 110 }
 111
 112 #if 0
 113 void TaiwanCalendar::timeToFields(UDate theTime, UBool quick, UErrorCode& status)
 114 {
 115     //Calendar::timeToFields(theTime, quick, status);
 116
 117     int32_t era = internalGet(UCAL_ERA);
 118     int32_t year = internalGet(UCAL_YEAR);
 119
 120     if(era == GregorianCalendar::BC) {
 121         year = 1-year;
 122         era = TaiwanCalendar::MINGUO;
 123     } else if(era == GregorianCalendar::AD) {
 124         era = TaiwanCalendar::MINGUO;
 125     } else {
 126         status = U_INTERNAL_PROGRAM_ERROR;
 127     }
 128
 129     year = year - kTaiwanEraStart;
 130
 131     internalSet(UCAL_ERA, era);
 132     internalSet(UCAL_YEAR, year);
 133 }
 134 #endif
 135
 136 /**
 137  * The system maintains a static default century start date and Year.  They are
 138  * initialized the first time they are used.  Once the system default century date
 139  * and year are set, they do not change.
 140  */
 141 static UDate           gSystemDefaultCenturyStart       = DBL_MIN;
 142 static int32_t         gSystemDefaultCenturyStartYear   = -1;
 143 static icu::UInitOnce  gSystemDefaultCenturyInit        = U_INITONCE_INITIALIZER;
 144
 145 UBool TaiwanCalendar::haveDefaultCentury() const
 146 {
 147     return TRUE;
 148 }
 149
 150 static void U_CALLCONV initializeSystemDefaultCentury()
 151 {
 152     // initialize systemDefaultCentury and systemDefaultCenturyYear based
 153     // on the current time.  They'll be set to 80 years before
 154     // the current time.
 155     UErrorCode status = U_ZERO_ERROR;
 156     TaiwanCalendar calendar(Locale("@calendar=roc"),status);
 157     if (U_SUCCESS(status))
 158     {
 159         calendar.setTime(Calendar::getNow(), status);
 160         calendar.add(UCAL_YEAR, -80, status);
 161
 162         gSystemDefaultCenturyStart = calendar.getTime(status);
 163         gSystemDefaultCenturyStartYear = calendar.get(UCAL_YEAR, status);
 164     }
 165     // We have no recourse upon failure unless we want to propagate the failure
 166     // out.
 167 }
 168
 169 UDate TaiwanCalendar::defaultCenturyStart() const {
 170     // lazy-evaluate systemDefaultCenturyStart
 171     umtx_initOnce(gSystemDefaultCenturyInit, &initializeSystemDefaultCentury);
 172     return gSystemDefaultCenturyStart;
 173 }
 174
 175 int32_t TaiwanCalendar::defaultCenturyStartYear() const {
 176     // lazy-evaluate systemDefaultCenturyStartYear
 177     umtx_initOnce(gSystemDefaultCenturyInit, &initializeSystemDefaultCentury);
 178     return gSystemDefaultCenturyStartYear;
 179 }
 180
 181 U_NAMESPACE_END
 182
 183 #endif