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[apple/icu.git] / 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 TaiwanCalendar* TaiwanCalendar::clone() 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
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