icuSources/i18n/cecal.cpp

   1 /*
   2 *******************************************************************************
   3 * Copyright (C) 2003 - 2009, 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 "cecal.h"
  13 #include "gregoimp.h"   //Math
  14
  15 U_NAMESPACE_BEGIN
  16
  17 static const int32_t LIMITS[UCAL_FIELD_COUNT][4] = {
  18     // Minimum  Greatest    Least  Maximum
  19     //           Minimum  Maximum
  20     {        0,        0,        1,        1}, // ERA
  21     {        1,        1,  5000000,  5000000}, // YEAR
  22     {        0,        0,       12,       12}, // MONTH
  23     {        1,        1,       52,       53}, // WEEK_OF_YEAR
  24     {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // WEEK_OF_MONTH
  25     {        1,        1,        5,       30}, // DAY_OF_MONTH
  26     {        1,        1,      365,      366}, // DAY_OF_YEAR
  27     {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DAY_OF_WEEK
  28     {       -1,       -1,        1,        5}, // DAY_OF_WEEK_IN_MONTH
  29     {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // AM_PM
  30     {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // HOUR
  31     {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // HOUR_OF_DAY
  32     {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MINUTE
  33     {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // SECOND
  34     {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MILLISECOND
  35     {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // ZONE_OFFSET
  36     {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DST_OFFSET
  37     { -5000000, -5000000,  5000000,  5000000}, // YEAR_WOY
  38     {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DOW_LOCAL
  39     { -5000000, -5000000,  5000000,  5000000}, // EXTENDED_YEAR
  40     {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // JULIAN_DAY
  41     {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MILLISECONDS_IN_DAY
  42     {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // IS_LEAP_MONTH
  43 };
  44
  45 //-------------------------------------------------------------------------
  46 // Constructors...
  47 //-------------------------------------------------------------------------
  48
  49 CECalendar::CECalendar(const Locale& aLocale, UErrorCode& success)
  50 :   Calendar(TimeZone::createDefault(), aLocale, success)
  51 {
  52     setTimeInMillis(getNow(), success);
  53 }
  54
  55 CECalendar::CECalendar (const CECalendar& other)
  56 :   Calendar(other)
  57 {
  58 }
  59
  60 CECalendar::~CECalendar()
  61 {
  62 }
  63
  64 CECalendar&
  65 CECalendar::operator=(const CECalendar& right)
  66 {
  67     Calendar::operator=(right);
  68     return *this;
  69 }
  70
  71 //-------------------------------------------------------------------------
  72 // Calendar framework
  73 //-------------------------------------------------------------------------
  74
  75 int32_t
  76 CECalendar::handleComputeMonthStart(int32_t eyear,int32_t emonth, UBool /*useMonth*/) const
  77 {
  78     return ceToJD(eyear, emonth, 0, getJDEpochOffset());
  79 }
  80
  81 int32_t
  82 CECalendar::handleGetLimit(UCalendarDateFields field, ELimitType limitType) const
  83 {
  84     return LIMITS[field][limitType];
  85 }
  86
  87 UBool
  88 CECalendar::inDaylightTime(UErrorCode& status) const
  89 {
  90     if (U_FAILURE(status) || !getTimeZone().useDaylightTime()) {
  91         return FALSE;
  92     }
  93
  94     // Force an update of the state of the Calendar.
  95     ((CECalendar*)this)->complete(status); // cast away const
  96
  97     return (UBool)(U_SUCCESS(status) ? (internalGet(UCAL_DST_OFFSET) != 0) : FALSE);
  98 }
  99
 100 UBool
 101 CECalendar::haveDefaultCentury() const
 102 {
 103     return TRUE;
 104 }
 105
 106 //-------------------------------------------------------------------------
 107 // Calendar system Conversion methods...
 108 //-------------------------------------------------------------------------
 109 int32_t
 110 CECalendar::ceToJD(int32_t year, int32_t month, int32_t date, int32_t jdEpochOffset)
 111 {
 112     // handle month > 12, < 0 (e.g. from add/set)
 113     if ( month >= 0 ) {
 114         year += month/13;
 115         month %= 13;
 116     } else {
 117         ++month;
 118         year += month/13 - 1;
 119         month = month%13 + 12;
 120     }
 121     return (int32_t) (
 122         jdEpochOffset                   // difference from Julian epoch to 1,1,1
 123         + 365 * year                    // number of days from years
 124         + ClockMath::floorDivide(year, 4)    // extra day of leap year
 125         + 30 * month                    // number of days from months (months are 0-based)
 126         + date - 1                      // number of days for present month (1 based)
 127         );
 128 }
 129
 130 void
 131 CECalendar::jdToCE(int32_t julianDay, int32_t jdEpochOffset, int32_t& year, int32_t& month, int32_t& day)
 132 {
 133     int32_t c4; // number of 4 year cycle (1461 days)
 134     int32_t r4; // remainder of 4 year cycle, always positive
 135
 136     c4 = ClockMath::floorDivide(julianDay - jdEpochOffset, 1461, r4);
 137
 138     year = 4 * c4 + (r4/365 - r4/1460); // 4 * <number of 4year cycle> + <years within the last cycle>
 139
 140     int32_t doy = (r4 == 1460) ? 365 : (r4 % 365); // days in present year
 141
 142     month = doy / 30;       // 30 -> Coptic/Ethiopic month length up to 12th month
 143     day = (doy % 30) + 1;   // 1-based days in a month
 144 }
 145
 146 U_NAMESPACE_END
 147
 148 #endif /* #if !UCONFIG_NO_FORMATTING */
 149 //eof