Check in the pristine copy of ICU 4.6...

icu46/source/i18n/indiancal.cpp

+/*
+ * Copyright (C) 2003-2009, International Business Machines Corporation
+ * and others. All Rights Reserved.
+ ******************************************************************************
+ *
+ * File INDIANCAL.CPP
+ *****************************************************************************
+ */
+
+#include "indiancal.h"
+#include <stdlib.h>
+#if !UCONFIG_NO_FORMATTING
+
+#include "mutex.h"
+#include <float.h>
+#include "gregoimp.h" // Math
+#include "astro.h" // CalendarAstronomer
+#include "uhash.h"
+#include "ucln_in.h"
+
+// Debugging
+#ifdef U_DEBUG_INDIANCAL
+#include <stdio.h>
+#include <stdarg.h>
+
+#endif
+
+U_NAMESPACE_BEGIN
+
+// Implementation of the IndianCalendar class
+
+//-------------------------------------------------------------------------
+// Constructors...
+//-------------------------------------------------------------------------
+
+
+Calendar* IndianCalendar::clone() const {
+  return new IndianCalendar(*this);
+}
+
+IndianCalendar::IndianCalendar(const Locale& aLocale, UErrorCode& success)
+  :   Calendar(TimeZone::createDefault(), aLocale, success)
+{
+  setTimeInMillis(getNow(), success); // Call this again now that the vtable is set up properly.
+}
+
+IndianCalendar::IndianCalendar(const IndianCalendar& other) : Calendar(other) {
+}
+
+IndianCalendar::~IndianCalendar()
+{
+}
+const char *IndianCalendar::getType() const { 
+   return "indian";
+}
+  
+static const int32_t LIMITS[UCAL_FIELD_COUNT][4] = {
+    // Minimum  Greatest     Least   Maximum
+    //           Minimum   Maximum
+    {        0,        0,        0,        0}, // ERA
+    { -5000000, -5000000,  5000000,  5000000}, // YEAR
+    {        0,        0,       11,       11}, // MONTH
+    {        1,        1,       52,       53}, // WEEK_OF_YEAR
+    {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // WEEK_OF_MONTH
+    {        1,        1,       30,       31}, // DAY_OF_MONTH
+    {        1,        1,      365,      366}, // DAY_OF_YEAR
+    {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DAY_OF_WEEK
+    {       -1,       -1,        5,        5}, // DAY_OF_WEEK_IN_MONTH
+    {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // AM_PM
+    {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // HOUR
+    {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // HOUR_OF_DAY
+    {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MINUTE
+    {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // SECOND
+    {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MILLISECOND
+    {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // ZONE_OFFSET
+    {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DST_OFFSET
+    { -5000000, -5000000,  5000000,  5000000}, // YEAR_WOY
+    {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DOW_LOCAL
+    { -5000000, -5000000,  5000000,  5000000}, // EXTENDED_YEAR
+    {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // JULIAN_DAY
+    {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MILLISECONDS_IN_DAY
+    {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // IS_LEAP_MONTH
+};
+
+static const double JULIAN_EPOCH = 1721425.5;
+static const int32_t INDIAN_ERA_START  = 78;
+static const int32_t INDIAN_YEAR_START = 80;
+
+int32_t IndianCalendar::handleGetLimit(UCalendarDateFields field, ELimitType limitType) const {
+  return LIMITS[field][limitType];
+}
+
+/*
+ * Determine whether the given gregorian year is a Leap year 
+ */
+static UBool isGregorianLeap(int32_t year)
+{
+    return ((year % 4) == 0) && (!(((year % 100) == 0) && ((year % 400) != 0))); 
+}
+  
+//----------------------------------------------------------------------
+// Calendar framework
+//----------------------------------------------------------------------
+
+/*
+ * Return the length (in days) of the given month.
+ *
+ * @param eyear  The year in Saka Era
+ * @param month  The month(0-based) in Indian calendar
+ */
+int32_t IndianCalendar::handleGetMonthLength(int32_t eyear, int32_t month) const {
+   if (month < 0 || month > 11) {
+      eyear += ClockMath::floorDivide(month, 12, month);
+   }
+
+   if (isGregorianLeap(eyear + INDIAN_ERA_START) && month == 0) {
+       return 31;
+   }
+
+   if (month >= 1 && month <= 5) {
+       return 31;
+   }
+
+   return 30;
+}
+
+/*
+ * Return the number of days in the given Indian year
+ *
+ * @param eyear The year in Saka Era.
+ */
+int32_t IndianCalendar::handleGetYearLength(int32_t eyear) const {
+    return isGregorianLeap(eyear + INDIAN_ERA_START) ? 366 : 365;
+}
+/*
+ * Returns the Julian Day corresponding to gregorian date
+ *
+ * @param year The Gregorian year
+ * @param month The month in Gregorian Year
+ * @param date The date in Gregorian day in month
+ */
+static double gregorianToJD(int32_t year, int32_t month, int32_t date) {
+   double julianDay = (JULIAN_EPOCH - 1) +
+      (365 * (year - 1)) +
+      uprv_floor((year - 1) / 4) +
+      (-uprv_floor((year - 1) / 100)) +
+      uprv_floor((year - 1) / 400) +
+      uprv_floor((((367 * month) - 362) / 12) +
+            ((month <= 2) ? 0 :
+             (isGregorianLeap(year) ? -1 : -2)
+            ) +
+            date);
+
+   return julianDay;
+}
+
+/*
+ * Returns the Gregorian Date corresponding to a given Julian Day
+ * @param jd The Julian Day
+ */
+static int32_t* jdToGregorian(double jd, int32_t gregorianDate[3]) {
+   double wjd, depoch, quadricent, dqc, cent, dcent, quad, dquad, yindex, yearday, leapadj;
+   int32_t year, month, day;
+   wjd = uprv_floor(jd - 0.5) + 0.5;
+   depoch = wjd - JULIAN_EPOCH;
+   quadricent = uprv_floor(depoch / 146097);
+   dqc = (int32_t)uprv_floor(depoch) % 146097;
+   cent = uprv_floor(dqc / 36524);
+   dcent = (int32_t)uprv_floor(dqc) % 36524;
+   quad = uprv_floor(dcent / 1461);
+   dquad = (int32_t)uprv_floor(dcent) % 1461;
+   yindex = uprv_floor(dquad / 365);
+   year = (int32_t)((quadricent * 400) + (cent * 100) + (quad * 4) + yindex);
+   if (!((cent == 4) || (yindex == 4))) {
+      year++;
+   }
+   yearday = wjd - gregorianToJD(year, 1, 1);
+   leapadj = ((wjd < gregorianToJD(year, 3, 1)) ? 0
+         :
+         (isGregorianLeap(year) ? 1 : 2)
+         );
+   month = (int32_t)uprv_floor((((yearday + leapadj) * 12) + 373) / 367);
+   day = (int32_t)(wjd - gregorianToJD(year, month, 1)) + 1;
+
+   gregorianDate[0] = year;
+   gregorianDate[1] = month;
+   gregorianDate[2] = day;
+
+   return gregorianDate;
+}
+
+   
+//-------------------------------------------------------------------------
+// Functions for converting from field values to milliseconds....
+//-------------------------------------------------------------------------
+static double IndianToJD(int32_t year, int32_t month, int32_t date) {
+   int32_t leapMonth, gyear, m;
+   double start, jd;
+
+   gyear = year + INDIAN_ERA_START;
+
+
+   if(isGregorianLeap(gyear)) {
+      leapMonth = 31;
+      start = gregorianToJD(gyear, 3, 21);
+   } 
+   else {
+      leapMonth = 30;
+      start = gregorianToJD(gyear, 3, 22);
+   }
+
+   if (month == 1) {
+      jd = start + (date - 1);
+   } else {
+      jd = start + leapMonth;
+      m = month - 2;
+
+      //m = Math.min(m, 5);
+      if (m > 5) {
+          m = 5;
+      }
+
+      jd += m * 31;
+
+      if (month >= 8) {
+         m = month - 7;
+         jd += m * 30;
+      }
+      jd += date - 1;
+   }
+
+   return jd;
+}
+
+/*
+ * Return JD of start of given month/year of Indian Calendar
+ * @param eyear The year in Indian Calendar measured from Saka Era (78 AD).
+ * @param month The month in Indian calendar
+ */
+int32_t IndianCalendar::handleComputeMonthStart(int32_t eyear, int32_t month, UBool /* useMonth */ ) const {
+
+   //month is 0 based; converting it to 1-based 
+   int32_t imonth;
+
+    // If the month is out of range, adjust it into range, and adjust the extended eyar accordingly
+   if (month < 0 || month > 11) {
+      eyear += (int32_t)ClockMath::floorDivide(month, 12, month);
+   }
+
+   if(month == 12){
+       imonth = 1;
+   } else {
+       imonth = month + 1; 
+   }
+   
+   double jd = IndianToJD(eyear ,imonth, 1);
+
+   return (int32_t)jd;
+}
+
+//-------------------------------------------------------------------------
+// Functions for converting from milliseconds to field values
+//-------------------------------------------------------------------------
+
+int32_t IndianCalendar::handleGetExtendedYear() {
+    int32_t year;
+
+    if (newerField(UCAL_EXTENDED_YEAR, UCAL_YEAR) == UCAL_EXTENDED_YEAR) {
+        year = internalGet(UCAL_EXTENDED_YEAR, 1); // Default to year 1
+    } else {
+        year = internalGet(UCAL_YEAR, 1); // Default to year 1
+    }
+
+    return year;
+}
+
+/*
+ * Override Calendar to compute several fields specific to the Indian
+ * calendar system.  These are:
+ *
+ * <ul><li>ERA
+ * <li>YEAR
+ * <li>MONTH
+ * <li>DAY_OF_MONTH
+ * <li>EXTENDED_YEAR</ul>
+ * 
+ * The DAY_OF_WEEK and DOW_LOCAL fields are already set when this
+ * method is called. The getGregorianXxx() methods return Gregorian
+ * calendar equivalents for the given Julian day.
+ */
+void IndianCalendar::handleComputeFields(int32_t julianDay, UErrorCode&  /* status */) {
+    double jdAtStartOfGregYear;
+    int32_t leapMonth, IndianYear, yday, IndianMonth, IndianDayOfMonth, mday;
+    int32_t gregorianYear;      // Stores gregorian date corresponding to Julian day;
+    int32_t gd[3];
+
+    gregorianYear = jdToGregorian(julianDay, gd)[0];          // Gregorian date for Julian day
+    IndianYear = gregorianYear - INDIAN_ERA_START;            // Year in Saka era
+    jdAtStartOfGregYear = gregorianToJD(gregorianYear, 1, 1); // JD at start of Gregorian year
+    yday = (int32_t)(julianDay - jdAtStartOfGregYear);        // Day number in Gregorian year (starting from 0)
+
+    if (yday < INDIAN_YEAR_START) {
+        // Day is at the end of the preceding Saka year
+        IndianYear -= 1;
+        leapMonth = isGregorianLeap(gregorianYear - 1) ? 31 : 30; // Days in leapMonth this year, previous Gregorian year
+        yday += leapMonth + (31 * 5) + (30 * 3) + 10;
+    } else {
+        leapMonth = isGregorianLeap(gregorianYear) ? 31 : 30; // Days in leapMonth this year
+        yday -= INDIAN_YEAR_START;
+    }
+
+    if (yday < leapMonth) {
+        IndianMonth = 0;
+        IndianDayOfMonth = yday + 1;
+    } else {
+        mday = yday - leapMonth;
+        if (mday < (31 * 5)) {
+            IndianMonth = (int32_t)uprv_floor(mday / 31) + 1;
+            IndianDayOfMonth = (mday % 31) + 1;
+        } else {
+            mday -= 31 * 5;
+            IndianMonth = (int32_t)uprv_floor(mday / 30) + 6;
+            IndianDayOfMonth = (mday % 30) + 1;
+        }
+   }
+
+   internalSet(UCAL_ERA, 0);
+   internalSet(UCAL_EXTENDED_YEAR, IndianYear);
+   internalSet(UCAL_YEAR, IndianYear);
+   internalSet(UCAL_MONTH, IndianMonth);
+   internalSet(UCAL_DAY_OF_MONTH, IndianDayOfMonth);
+   internalSet(UCAL_DAY_OF_YEAR, yday + 1); // yday is 0-based
+}    
+
+UBool
+IndianCalendar::inDaylightTime(UErrorCode& status) const
+{
+    // copied from GregorianCalendar
+    if (U_FAILURE(status) || !getTimeZone().useDaylightTime()) {
+        return FALSE;
+    }
+
+    // Force an update of the state of the Calendar.
+    ((IndianCalendar*)this)->complete(status); // cast away const
+
+    return (UBool)(U_SUCCESS(status) ? (internalGet(UCAL_DST_OFFSET) != 0) : FALSE);
+}
+
+// default century
+const UDate     IndianCalendar::fgSystemDefaultCentury          = DBL_MIN;
+const int32_t   IndianCalendar::fgSystemDefaultCenturyYear      = -1;
+
+UDate           IndianCalendar::fgSystemDefaultCenturyStart     = DBL_MIN;
+int32_t         IndianCalendar::fgSystemDefaultCenturyStartYear = -1;
+
+
+UBool IndianCalendar::haveDefaultCentury() const
+{
+    return TRUE;
+}
+
+UDate IndianCalendar::defaultCenturyStart() const
+{
+    return internalGetDefaultCenturyStart();
+}
+
+int32_t IndianCalendar::defaultCenturyStartYear() const
+{
+    return internalGetDefaultCenturyStartYear();
+}
+
+UDate
+IndianCalendar::internalGetDefaultCenturyStart() const
+{
+    // lazy-evaluate systemDefaultCenturyStart
+    UBool needsUpdate;
+    { 
+        Mutex m;
+        needsUpdate = (fgSystemDefaultCenturyStart == fgSystemDefaultCentury);
+    }
+
+    if (needsUpdate) {
+        initializeSystemDefaultCentury();
+    }
+
+    // use defaultCenturyStart unless it's the flag value;
+    // then use systemDefaultCenturyStart
+
+    return fgSystemDefaultCenturyStart;
+}
+
+int32_t
+IndianCalendar::internalGetDefaultCenturyStartYear() const
+{
+    // lazy-evaluate systemDefaultCenturyStartYear
+    UBool needsUpdate;
+    { 
+        Mutex m;
+
+        needsUpdate = (fgSystemDefaultCenturyStart == fgSystemDefaultCentury);
+    }
+
+    if (needsUpdate) {
+        initializeSystemDefaultCentury();
+    }
+
+    // use defaultCenturyStart unless it's the flag value;
+    // then use systemDefaultCenturyStartYear
+
+    return    fgSystemDefaultCenturyStartYear;
+}
+
+void
+IndianCalendar::initializeSystemDefaultCentury()
+{
+    // initialize systemDefaultCentury and systemDefaultCenturyYear based
+    // on the current time.  They'll be set to 80 years before
+    // the current time.
+    // No point in locking as it should be idempotent.
+    if (fgSystemDefaultCenturyStart == fgSystemDefaultCentury) {
+        UErrorCode status = U_ZERO_ERROR;
+
+        IndianCalendar calendar(Locale("@calendar=Indian"),status);
+        if (U_SUCCESS(status)) {
+            calendar.setTime(Calendar::getNow(), status);
+            calendar.add(UCAL_YEAR, -80, status);
+
+            UDate    newStart = calendar.getTime(status);
+            int32_t  newYear  = calendar.get(UCAL_YEAR, status);
+
+            {
+                Mutex m;
+
+                fgSystemDefaultCenturyStart = newStart;
+                fgSystemDefaultCenturyStartYear = newYear;
+            }
+        }
+
+        // We have no recourse upon failure unless we want to propagate the failure
+        // out.
+    }
+}
+
+UOBJECT_DEFINE_RTTI_IMPLEMENTATION(IndianCalendar)
+
+U_NAMESPACE_END
+
+#endif
+