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
15U_NAMESPACE_BEGIN
16
17static 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
49CECalendar::CECalendar(const Locale& aLocale, UErrorCode& success)
50:   Calendar(TimeZone::createDefault(), aLocale, success)
51{
52    setTimeInMillis(getNow(), success);
53}
54
55CECalendar::CECalendar (const CECalendar& other)
56:   Calendar(other)
57{
58}
59
60CECalendar::~CECalendar()
61{
62}
63
64CECalendar&
65CECalendar::operator=(const CECalendar& right)
66{
67    Calendar::operator=(right);
68    return *this;
69}
70
71//-------------------------------------------------------------------------
72// Calendar framework
73//-------------------------------------------------------------------------
74
75int32_t
76CECalendar::handleComputeMonthStart(int32_t eyear,int32_t emonth, UBool /*useMonth*/) const
77{
78    return ceToJD(eyear, emonth, 0, getJDEpochOffset());
79}
80
81int32_t
82CECalendar::handleGetLimit(UCalendarDateFields field, ELimitType limitType) const
83{
84    return LIMITS[field][limitType];
85}
86
87UBool
88CECalendar::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
100UBool
101CECalendar::haveDefaultCentury() const
102{
103    return TRUE;
104}
105
106//-------------------------------------------------------------------------
107// Calendar system Conversion methods...
108//-------------------------------------------------------------------------
109int32_t
110CECalendar::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
130void
131CECalendar::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
146U_NAMESPACE_END
147
148#endif /* #if !UCONFIG_NO_FORMATTING */
149//eof
150