Check in the pristine copy of ICU 4.6...

icu46/source/i18n/ethpccal.cpp

+/*
+*******************************************************************************
+* Copyright (C) 2003 - 2009, International Business Machines Corporation and  *
+* others. All Rights Reserved.                                                *
+*******************************************************************************
+*/
+
+#include "unicode/utypes.h"
+
+#if !UCONFIG_NO_FORMATTING
+
+#include "umutex.h"
+#include "ethpccal.h"
+#include "cecal.h"
+#include <float.h>
+
+U_NAMESPACE_BEGIN
+
+UOBJECT_DEFINE_RTTI_IMPLEMENTATION(EthiopicCalendar)
+
+//static const int32_t JD_EPOCH_OFFSET_AMETE_ALEM = -285019;
+static const int32_t JD_EPOCH_OFFSET_AMETE_MIHRET = 1723856;
+static const int32_t AMETE_MIHRET_DELTA = 5500; // 5501 - 1 (Amete Alem 5501 = Amete Mihret 1)
+
+//-------------------------------------------------------------------------
+// Constructors...
+//-------------------------------------------------------------------------
+
+EthiopicCalendar::EthiopicCalendar(const Locale& aLocale,
+                                   UErrorCode& success,
+                                   EEraType type /*= AMETE_MIHRET_ERA*/)
+:   CECalendar(aLocale, success),
+    eraType(type)
+{
+}
+
+EthiopicCalendar::EthiopicCalendar(const EthiopicCalendar& other)
+:   CECalendar(other),
+    eraType(other.eraType)
+{
+}
+
+EthiopicCalendar::~EthiopicCalendar()
+{
+}
+
+Calendar*
+EthiopicCalendar::clone() const
+{
+    return new EthiopicCalendar(*this);
+}
+
+const char *
+EthiopicCalendar::getType() const
+{
+    if (isAmeteAlemEra()) {
+        return "ethiopic-amete-alem";
+    }
+    return "ethiopic";
+}
+
+void
+EthiopicCalendar::setAmeteAlemEra(UBool onOff)
+{
+    eraType = onOff ? AMETE_ALEM_ERA : AMETE_MIHRET_ERA;
+}
+    
+UBool
+EthiopicCalendar::isAmeteAlemEra() const
+{
+    return (eraType == AMETE_ALEM_ERA);
+}
+
+//-------------------------------------------------------------------------
+// Calendar framework
+//-------------------------------------------------------------------------
+
+int32_t
+EthiopicCalendar::handleGetExtendedYear()
+{
+    // Ethiopic calendar uses EXTENDED_YEAR aligned to
+    // Amelete Hihret year always.
+    int32_t eyear;
+    if (newerField(UCAL_EXTENDED_YEAR, UCAL_YEAR) == UCAL_EXTENDED_YEAR) {
+        eyear = internalGet(UCAL_EXTENDED_YEAR, 1); // Default to year 1
+    } else if (isAmeteAlemEra()) {
+        eyear = internalGet(UCAL_YEAR, 1 + AMETE_MIHRET_DELTA)
+            - AMETE_MIHRET_DELTA; // Default to year 1 of Amelete Mihret
+    } else {
+        // The year defaults to the epoch start, the era to AMETE_MIHRET
+        int32_t era = internalGet(UCAL_ERA, AMETE_MIHRET);
+        if (era == AMETE_MIHRET) {
+            eyear = internalGet(UCAL_YEAR, 1); // Default to year 1
+        } else {
+            eyear = internalGet(UCAL_YEAR, 1) - AMETE_MIHRET_DELTA;
+        }
+    }
+    return eyear;
+}
+
+void
+EthiopicCalendar::handleComputeFields(int32_t julianDay, UErrorCode &/*status*/)
+{
+    int32_t eyear, month, day, era, year;
+    jdToCE(julianDay, getJDEpochOffset(), eyear, month, day);
+
+    if (isAmeteAlemEra()) {
+        era = AMETE_ALEM;
+        year = eyear + AMETE_MIHRET_DELTA;
+    } else {
+        if (eyear > 0) {
+            era = AMETE_MIHRET;
+            year = eyear;
+        } else {
+            era = AMETE_ALEM;
+            year = eyear + AMETE_MIHRET_DELTA;
+        }
+    }
+
+    internalSet(UCAL_EXTENDED_YEAR, eyear);
+    internalSet(UCAL_ERA, era);
+    internalSet(UCAL_YEAR, year);
+    internalSet(UCAL_MONTH, month);
+    internalSet(UCAL_DATE, day);
+    internalSet(UCAL_DAY_OF_YEAR, (30 * month) + day);
+}
+
+int32_t
+EthiopicCalendar::handleGetLimit(UCalendarDateFields field, ELimitType limitType) const
+{
+    if (isAmeteAlemEra() && field == UCAL_ERA) {
+        return 0; // Only one era in this mode, era is always 0
+    }
+    return CECalendar::handleGetLimit(field, limitType);
+}
+
+const UDate     EthiopicCalendar::fgSystemDefaultCentury        = DBL_MIN;
+const int32_t   EthiopicCalendar::fgSystemDefaultCenturyYear    = -1;
+
+UDate           EthiopicCalendar::fgSystemDefaultCenturyStart       = DBL_MIN;
+int32_t         EthiopicCalendar::fgSystemDefaultCenturyStartYear   = -1;
+
+UDate
+EthiopicCalendar::defaultCenturyStart() const
+{
+    initializeSystemDefaultCentury();
+    return fgSystemDefaultCenturyStart;
+}
+
+int32_t
+EthiopicCalendar::defaultCenturyStartYear() const
+{
+    initializeSystemDefaultCentury();
+    if (isAmeteAlemEra()) {
+        return fgSystemDefaultCenturyStartYear + AMETE_MIHRET_DELTA;
+    }
+    return fgSystemDefaultCenturyStartYear;
+}
+
+void
+EthiopicCalendar::initializeSystemDefaultCentury()
+{
+    // lazy-evaluate systemDefaultCenturyStart
+    UBool needsUpdate;
+    UMTX_CHECK(NULL, (fgSystemDefaultCenturyStart == fgSystemDefaultCentury), needsUpdate);
+
+    if (!needsUpdate) {
+        return;
+    }
+
+    UErrorCode status = U_ZERO_ERROR;
+
+    EthiopicCalendar calendar(Locale("@calendar=ethiopic"), 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);
+        {
+            umtx_lock(NULL);
+            fgSystemDefaultCenturyStartYear = newYear;
+            fgSystemDefaultCenturyStart = newStart;
+            umtx_unlock(NULL);
+        }
+    }
+    // We have no recourse upon failure unless we want to propagate the failure
+    // out.
+}
+
+int32_t
+EthiopicCalendar::getJDEpochOffset() const
+{
+    return JD_EPOCH_OFFSET_AMETE_MIHRET;
+}
+
+
+#if 0
+// We do not want to introduce this API in ICU4C.
+// It was accidentally introduced in ICU4J as a public API.
+
+//-------------------------------------------------------------------------
+// Calendar system Conversion methods...
+//-------------------------------------------------------------------------
+
+int32_t
+EthiopicCalendar::ethiopicToJD(int32_t year, int32_t month, int32_t date)
+{
+    return ceToJD(year, month, date, JD_EPOCH_OFFSET_AMETE_MIHRET);
+}
+#endif
+
+U_NAMESPACE_END
+
+#endif