icuSources/i18n/cecal.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 - 2009, International Business Machines Corporation and  *
   6 * others. All Rights Reserved.                                                *
   7 *******************************************************************************
   8 */
   9
  10 #include "unicode/utypes.h"
  11
  12 #if !UCONFIG_NO_FORMATTING
  13
  14 #include "cecal.h"
  15 #include "gregoimp.h"   //Math
  16
  17 U_NAMESPACE_BEGIN
  18
  19 static const int32_t LIMITS[UCAL_FIELD_COUNT][4] = {
  20     // Minimum  Greatest    Least  Maximum
  21     //           Minimum  Maximum
  22     {        0,        0,        1,        1}, // ERA
  23     {        1,        1,  5000000,  5000000}, // YEAR
  24     {        0,        0,       12,       12}, // MONTH
  25     {        1,        1,       52,       53}, // WEEK_OF_YEAR
  26     {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // WEEK_OF_MONTH
  27     {        1,        1,        5,       30}, // DAY_OF_MONTH
  28     {        1,        1,      365,      366}, // DAY_OF_YEAR
  29     {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DAY_OF_WEEK
  30     {       -1,       -1,        1,        5}, // DAY_OF_WEEK_IN_MONTH
  31     {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // AM_PM
  32     {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // HOUR
  33     {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // HOUR_OF_DAY
  34     {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MINUTE
  35     {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // SECOND
  36     {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MILLISECOND
  37     {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // ZONE_OFFSET
  38     {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DST_OFFSET
  39     { -5000000, -5000000,  5000000,  5000000}, // YEAR_WOY
  40     {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DOW_LOCAL
  41     { -5000000, -5000000,  5000000,  5000000}, // EXTENDED_YEAR
  42     {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // JULIAN_DAY
  43     {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MILLISECONDS_IN_DAY
  44     {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // IS_LEAP_MONTH
  45 };
  46
  47 //-------------------------------------------------------------------------
  48 // Constructors...
  49 //-------------------------------------------------------------------------
  50
  51 CECalendar::CECalendar(const Locale& aLocale, UErrorCode& success)
  52 :   Calendar(TimeZone::createDefault(), aLocale, success)
  53 {
  54     setTimeInMillis(getNow(), success);
  55 }
  56
  57 CECalendar::CECalendar (const CECalendar& other)
  58 :   Calendar(other)
  59 {
  60 }
  61
  62 CECalendar::~CECalendar()
  63 {
  64 }
  65
  66 CECalendar&
  67 CECalendar::operator=(const CECalendar& right)
  68 {
  69     Calendar::operator=(right);
  70     return *this;
  71 }
  72
  73 //-------------------------------------------------------------------------
  74 // Calendar framework
  75 //-------------------------------------------------------------------------
  76
  77 int32_t
  78 CECalendar::handleComputeMonthStart(int32_t eyear,int32_t emonth, UBool /*useMonth*/) const
  79 {
  80     return ceToJD(eyear, emonth, 0, getJDEpochOffset());
  81 }
  82
  83 int32_t
  84 CECalendar::handleGetLimit(UCalendarDateFields field, ELimitType limitType) const
  85 {
  86     return LIMITS[field][limitType];
  87 }
  88
  89 UBool
  90 CECalendar::inDaylightTime(UErrorCode& status) const
  91 {
  92     if (U_FAILURE(status) || !getTimeZone().useDaylightTime()) {
  93         return FALSE;
  94     }
  95
  96     // Force an update of the state of the Calendar.
  97     ((CECalendar*)this)->complete(status); // cast away const
  98
  99     return (UBool)(U_SUCCESS(status) ? (internalGet(UCAL_DST_OFFSET) != 0) : FALSE);
 100 }
 101
 102 UBool
 103 CECalendar::haveDefaultCentury() const
 104 {
 105     return TRUE;
 106 }
 107
 108 //-------------------------------------------------------------------------
 109 // Calendar system Conversion methods...
 110 //-------------------------------------------------------------------------
 111 int32_t
 112 CECalendar::ceToJD(int32_t year, int32_t month, int32_t date, int32_t jdEpochOffset)
 113 {
 114     // handle month > 12, < 0 (e.g. from add/set)
 115     if ( month >= 0 ) {
 116         year += month/13;
 117         month %= 13;
 118     } else {
 119         ++month;
 120         year += month/13 - 1;
 121         month = month%13 + 12;
 122     }
 123     return (int32_t) (
 124         jdEpochOffset                   // difference from Julian epoch to 1,1,1
 125         + 365 * year                    // number of days from years
 126         + ClockMath::floorDivide(year, 4)    // extra day of leap year
 127         + 30 * month                    // number of days from months (months are 0-based)
 128         + date - 1                      // number of days for present month (1 based)
 129         );
 130 }
 131
 132 void
 133 CECalendar::jdToCE(int32_t julianDay, int32_t jdEpochOffset, int32_t& year, int32_t& month, int32_t& day)
 134 {
 135     int32_t c4; // number of 4 year cycle (1461 days)
 136     int32_t r4; // remainder of 4 year cycle, always positive
 137
 138     c4 = ClockMath::floorDivide(julianDay - jdEpochOffset, 1461, r4);
 139
 140     year = 4 * c4 + (r4/365 - r4/1460); // 4 * <number of 4year cycle> + <years within the last cycle>
 141
 142     int32_t doy = (r4 == 1460) ? 365 : (r4 % 365); // days in present year
 143
 144     month = doy / 30;       // 30 -> Coptic/Ethiopic month length up to 12th month
 145     day = (doy % 30) + 1;   // 1-based days in a month
 146 }
 147
 148 U_NAMESPACE_END
 149
 150 #endif /* #if !UCONFIG_NO_FORMATTING */
 151 //eof