Check in the pristine copy of ICU 4.6...

icu46/source/i18n/buddhcal.h

+/*
+ ********************************************************************************
+ * Copyright (C) 2003-2007, International Business Machines Corporation
+ * and others. All Rights Reserved.
+ ********************************************************************************
+ *
+ * File BUDDHCAL.H
+ *
+ * Modification History:
+ *
+ *   Date        Name        Description
+ *   05/13/2003  srl          copied from gregocal.h
+ ********************************************************************************
+ */
+
+#ifndef BUDDHCAL_H
+#define BUDDHCAL_H
+
+#include "unicode/utypes.h"
+
+#if !UCONFIG_NO_FORMATTING
+
+#include "unicode/calendar.h"
+#include "unicode/gregocal.h"
+
+U_NAMESPACE_BEGIN
+
+/**
+ * Concrete class which provides the Buddhist calendar.
+ * <P>
+ * <code>BuddhistCalendar</code> is a subclass of <code>GregorianCalendar</code>
+ * that numbers years since the birth of the Buddha.  This is the civil calendar
+ * in some predominantly Buddhist countries such as Thailand, and it is used for
+ * religious purposes elsewhere.
+ * <p>
+ * The Buddhist calendar is identical to the Gregorian calendar in all respects
+ * except for the year and era.  Years are numbered since the birth of the
+ * Buddha in 543 BC (Gregorian), so that 1 AD (Gregorian) is equivalent to 544
+ * BE (Buddhist Era) and 1998 AD is 2541 BE.
+ * <p>
+ * The Buddhist Calendar has only one allowable era: <code>BE</code>.  If the
+ * calendar is not in lenient mode (see <code>setLenient</code>), dates before
+ * 1/1/1 BE are rejected as an illegal argument.
+ * <p>
+ * @internal
+ */
+class BuddhistCalendar : public GregorianCalendar {
+public:
+
+    /**
+     * Useful constants for BuddhistCalendar.  Only one Era.
+     * @internal
+     */
+    enum EEras {
+       BE
+    };
+
+    /**
+     * Constructs a BuddhistCalendar based on the current time in the default time zone
+     * with the given locale.
+     *
+     * @param aLocale  The given locale.
+     * @param success  Indicates the status of BuddhistCalendar object construction.
+     *                 Returns U_ZERO_ERROR if constructed successfully.
+     * @internal
+     */
+    BuddhistCalendar(const Locale& aLocale, UErrorCode& success);
+
+
+    /**
+     * Destructor
+     * @internal
+     */
+    virtual ~BuddhistCalendar();
+
+    /**
+     * Copy constructor
+     * @param source    the object to be copied.
+     * @internal
+     */
+    BuddhistCalendar(const BuddhistCalendar& source);
+
+    /**
+     * Default assignment operator
+     * @param right    the object to be copied.
+     * @internal
+     */
+    BuddhistCalendar& operator=(const BuddhistCalendar& right);
+
+    /**
+     * Create and return a polymorphic copy of this calendar.
+     * @return    return a polymorphic copy of this calendar.
+     * @internal
+     */
+    virtual Calendar* clone(void) const;
+
+public:
+    /**
+     * Override Calendar Returns a unique class ID POLYMORPHICALLY. Pure virtual
+     * override. This method is to implement a simple version of RTTI, since not all C++
+     * compilers support genuine RTTI. Polymorphic operator==() and clone() methods call
+     * this method.
+     *
+     * @return   The class ID for this object. All objects of a given class have the
+     *           same class ID. Objects of other classes have different class IDs.
+     * @internal
+     */
+    virtual UClassID getDynamicClassID(void) const;
+
+    /**
+     * Return the class ID for this class. This is useful only for comparing to a return
+     * value from getDynamicClassID(). For example:
+     *
+     *      Base* polymorphic_pointer = createPolymorphicObject();
+     *      if (polymorphic_pointer->getDynamicClassID() ==
+     *          Derived::getStaticClassID()) ...
+     *
+     * @return   The class ID for all objects of this class.
+     * @internal
+     */
+    U_I18N_API static UClassID U_EXPORT2 getStaticClassID(void);
+
+    /**
+     * return the calendar type, "buddhist".
+     *
+     * @return calendar type
+     * @internal
+     */
+    virtual const char * getType() const;
+
+private:
+    BuddhistCalendar(); // default constructor not implemented
+
+ protected:
+    /**
+     * Return the extended year defined by the current fields.  This will
+     * use the UCAL_EXTENDED_YEAR field or the UCAL_YEAR and supra-year fields (such
+     * as UCAL_ERA) specific to the calendar system, depending on which set of
+     * fields is newer.
+     * @return the extended year
+     * @internal
+     */
+    virtual int32_t handleGetExtendedYear();
+    /**
+     * Subclasses may override this method to compute several fields
+     * specific to each calendar system.  
+     * @internal
+     */
+    virtual void handleComputeFields(int32_t julianDay, UErrorCode& status);
+    /**
+     * Subclass API for defining limits of different types.
+     * @param field one of the field numbers
+     * @param limitType one of <code>MINIMUM</code>, <code>GREATEST_MINIMUM</code>,
+     * <code>LEAST_MAXIMUM</code>, or <code>MAXIMUM</code>
+     * @internal
+     */
+    virtual int32_t handleGetLimit(UCalendarDateFields field, ELimitType limitType) const;
+        /**
+     * Return the Julian day number of day before the first day of the
+     * given month in the given extended year.  Subclasses should override
+     * this method to implement their calendar system.
+     * @param eyear the extended year
+     * @param month the zero-based month, or 0 if useMonth is false
+     * @param useMonth if false, compute the day before the first day of
+     * the given year, otherwise, compute the day before the first day of
+     * the given month
+     * @param return the Julian day number of the day before the first
+     * day of the given month and year
+     * @internal
+     */
+    virtual int32_t handleComputeMonthStart(int32_t eyear, int32_t month,
+                                            UBool useMonth) const;
+
+    /**
+     * Returns TRUE because the Buddhist Calendar does have a default century
+     * @internal
+     */
+    virtual UBool haveDefaultCentury() const;
+
+    /**
+     * Returns the date of the start of the default century
+     * @return start of century - in milliseconds since epoch, 1970
+     * @internal
+     */
+    virtual UDate defaultCenturyStart() const;
+
+    /**
+     * Returns the year in which the default century begins
+     * @internal
+     */
+    virtual int32_t defaultCenturyStartYear() const;
+
+ private: // default century stuff.
+    /**
+     * The system maintains a static default century start date.  This is initialized
+     * the first time it is used.  Before then, it is set to SYSTEM_DEFAULT_CENTURY to
+     * indicate an uninitialized state.  Once the system default century date and year
+     * are set, they do not change.
+     */
+    static UDate         fgSystemDefaultCenturyStart;
+
+    /**
+     * See documentation for systemDefaultCenturyStart.
+     */
+    static int32_t          fgSystemDefaultCenturyStartYear;
+
+    /**
+     * Default value that indicates the defaultCenturyStartYear is unitialized
+     */
+    static const int32_t    fgSystemDefaultCenturyYear;
+
+    /**
+     * start of default century, as a date
+     */
+    static const UDate        fgSystemDefaultCentury;
+
+    /**
+     * Returns the beginning date of the 100-year window that dates 
+     * with 2-digit years are considered to fall within.
+     */
+    UDate         internalGetDefaultCenturyStart(void) const;
+
+    /**
+     * Returns the first year of the 100-year window that dates with 
+     * 2-digit years are considered to fall within.
+     */
+    int32_t          internalGetDefaultCenturyStartYear(void) const;
+
+    /**
+     * Initializes the 100-year window that dates with 2-digit years
+     * are considered to fall within so that its start date is 80 years
+     * before the current time.
+     */
+    static void  initializeSystemDefaultCentury(void);
+};
+
+U_NAMESPACE_END
+
+#endif /* #if !UCONFIG_NO_FORMATTING */
+
+#endif // _GREGOCAL
+//eof
+