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diff --git a/libtdeedu/extdate/extcalendarsystem.h b/libtdeedu/extdate/extcalendarsystem.h
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+/*
+   Copyright (c) 2002 Carlos Moro <cfmoro@correo.uniovi.es>
+   Copyright (c) 2002-2003 Hans Petter Bieker <bieker@kde.org>
+   Copyright (c) 2004 Jason Harris <jharris@30doradus.org>
+
+	 This class has been derived from KCalendarSystem;
+	 the changesd made just replace TQDate objects with ExtDate objects.
+	 These changes by Jason Harris <jharris@30doradus.org>
+
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public
+   License as published by the Free Software Foundation; either
+   version 2 of the License, or (at your option) any later version.
+
+   This library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public License
+   along with this library; see the file COPYING.LIB.  If not, write to
+   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+   Boston, MA 02110-1301, USA.
+*/
+
+#ifndef EXTCALENDARSYSTEM_H
+#define EXTCALENDARSYSTEM_H
+
+#include "extdatetime.h"
+
+class KLocale;
+
+class ExtCalendarSystemPrivate;
+
+/**
+ * CalendarSystem abstract class, default derived kde gregorian class and
+ * factory class. Provides support for different calendar types for kde
+ * calendar widget and related stuff.
+ *
+ * Derived classes must be created through ExtCalendarFactory class
+ *
+ * @author Carlos Moro <cfmoro@correo.uniovi.es>
+ * @version $Id$
+ * @since 3.2
+ */
+class ExtCalendarSystem
+{
+public:
+  /**
+   * Constructor of abstract calendar class. This will be called by the derived classes.
+   *
+   * @param locale It will use this locale for translations, 0 means global.
+   */
+  ExtCalendarSystem(const KLocale * locale = 0);
+
+  /**
+   * Descructor.
+   */
+  virtual ~ExtCalendarSystem();
+
+  /**
+   * Gets specific calendar type year for a given gregorian date
+   *
+   * @param date gregorian date
+   * @return year
+   */
+  virtual int year (const ExtDate & date) const = 0;
+
+  /**
+   * Converts a date into a year literal
+   *
+   * @param pDate The date to convert
+   * @param bShort If the short version of should be used
+   * @return The year literal of the date
+   */
+  virtual TQString yearString(const ExtDate & pDate, bool bShort) const;
+
+  /**
+   * Converts a year literal of a part of a string into a integer starting at the beginning of the string
+   *
+   * @param sNum The string to parse
+   * @param iLength The number of TQChars used, and 0 if no valid symbols was found in the string
+   * @return An integer corresponding to the year
+   */
+  virtual int yearStringToInteger(const TQString & sNum, int & iLength) const;
+
+  /**
+   * Gets specific calendar type month for a given gregorian date
+   *
+   * @param date gregorian date
+   * @return month number
+   */
+  virtual int month (const ExtDate & date) const = 0;
+
+  /**
+   * Converts a date into a month literal
+   *
+   * @param pDate The date to convert
+   * @param bShort If the short version of should be used
+   * @return The month literal of the date
+   */
+  virtual TQString monthString(const ExtDate & pDate, bool bShort) const;
+
+  /**
+   * Converts a month literal of a part of a string into a integer starting at the beginning of the string
+   *
+   * @param sNum The string to parse
+   * @param iLength The number of TQChars used, and 0 if no valid symbols was found in the string
+   * @return An integer corresponding to the month
+   */
+  virtual int monthStringToInteger(const TQString & sNum, int & iLength) const;
+
+  /**
+   * Gets specific calendar type day number of month for a given date
+   *
+   * @param date gregorian date equivalent to the specific one
+   * @return day of the month
+   */
+  virtual int day (const ExtDate & date) const = 0;
+
+  /**
+   * Converts a date into a day literal
+   *
+   * @param pDate The date to convert
+   * @param bShort If the short version of should be used
+   * @return The day literal of the date
+   */
+  virtual TQString dayString(const ExtDate & pDate, bool bShort) const;
+
+  /**
+   * Converts a day literal of a part of a string into a integer starting at the beginning of the string
+   *
+   * @param sNum The string to parse
+   * @param iLength The number of TQChars used, and 0 if no valid symbols was found in the string
+   * @return An integer corresponding to the day
+   */
+  virtual int dayStringToInteger(const TQString & sNum, int & iLength) const;
+
+  /**
+   * Gets specific calendar type number of day of week number for a given
+   * date
+   *
+   * @param date gregorian date
+   * @return day of week
+   */
+  virtual int dayOfWeek (const ExtDate & date) const = 0;
+
+  /**
+   * Gets specific calendar type day number of year for a given date
+   *
+   * @param date gregorian date equivalent to the specific one
+   * @return day number
+   */
+  virtual int dayOfYear (const ExtDate & date) const = 0;
+
+  /**
+   * Changes the date's year, month and day. The range of the year, month
+   * and day depends on which calendar is being used.
+   *
+   * @param date Date to change
+   * @param y Year
+   * @param m Month number
+   * @param d Day of month
+   * @return true if the date is valid; otherwise returns false.
+   */
+  virtual bool setYMD(ExtDate & date, int y, int m, int d) const = 0;
+
+  /**
+   * Returns a TQDate object containing a date nyears later.
+   *
+   * @param date The old date
+   * @param nyears The number of years to add
+   * @return The new date
+   */
+  virtual ExtDate addYears(const ExtDate & date, int nyears) const = 0;
+
+  /**
+   * Returns a TQDate object containing a date nmonths later.
+   *
+   * @param date The old date
+   * @param nmonths The number of months to add
+   * @return The new date
+   */
+  virtual ExtDate addMonths(const ExtDate & date, int nmonths) const = 0;
+
+  /**
+   * Returns a TQDate object containing a date ndays later.
+   *
+   * @param date The old date
+   * @param ndays The number of days to add
+   * @return The new date
+   */
+  virtual ExtDate addDays(const ExtDate & date, int ndays) const = 0;
+
+  /**
+   * Gets specific calendar type number of month for a given year
+   *
+   * @param date The date whose year to use
+   * @return The number of months in that year
+   */
+  virtual int monthsInYear (const ExtDate & date) const = 0;
+
+  /**
+   * Gets the number of days in date whose years specified.
+   *
+   * @param date Gregorian date equivalent to the specific one
+   * @return The number of days in year
+   */
+  virtual int daysInYear (const ExtDate & date) const = 0;
+
+  /**
+   * Gets specific calendar type number of days in month for a given date
+   *
+   * @param date gregorian date
+   * @return number of days for month in date
+   */
+  virtual int daysInMonth (const ExtDate & date) const = 0;
+
+  /**
+   * Gets the number of weeks in a specified year
+   *
+   * @param year the year
+   * @return number of weeks in year
+   */
+  virtual int weeksInYear(int year) const = 0;
+
+  /**
+   * Gets specific calendar type week number for a given date
+   *
+   * @param date gregorian date
+   * @param yearNum The year the date belongs to
+   * @return week number
+   */
+  virtual int weekNumber(const ExtDate& date, int * yearNum = 0) const = 0;
+
+  /**
+   * Gets specific calendar type month name for a given month number
+   * If an invalid month is specified, TQString() is returned.
+   *
+   * @param month The month number
+   * @param year The year the month belongs to
+   * @param shortName Specifies if the short month name should be used
+   * @return The name of the month
+   */
+  virtual TQString monthName (int month, int year, bool shortName = false) const = 0;
+
+  /**
+   * Gets specific calendar type month name for a given gregorian date
+   *
+   * @param date Gregorian date
+   * @param shortName Specifies if the short month name should be used
+   * @return The name of the month
+   */
+  virtual TQString monthName (const ExtDate & date, bool shortName = false ) const = 0;
+
+  /**
+   * Returns a string containing the possessive form of the month name.
+   * ("of January", "of February", etc.)
+   * It's needed in long format dates in some languages.
+   * If an invalid month is specified, TQString() is returned.
+   *
+   * @param month The month number
+   * @param year The year the month belongs to
+   * @param shortName Specifies if the short month name should be used
+   *
+   * @return The possessive form of the name of the month
+   */
+  virtual TQString monthNamePossessive(int month, int year, bool shortName = false) const = 0;
+
+  /**
+   * Returns a string containing the possessive form of the month name.
+   * ("of January", "of February", etc.)
+   * It's needed in long format dates in some languages.
+   *
+   * @param date Gregorian date
+   * @param shortName Specifies if the short month name should be used
+   *
+   * @return The possessive form of the name of the month
+   */
+  virtual TQString monthNamePossessive(const ExtDate & date, bool shortName = false) const = 0;
+
+  /**
+   * Gets specific calendar type week day name
+   * If an invalid week day is specified, TQString() is returned.
+   *
+   * @param weekDay number of day in week (1 -> Monday)
+   * @param shortName short or complete day name
+   * @return day name
+   */
+  virtual TQString weekDayName (int weekDay, bool shortName = false) const = 0;
+
+  /**
+   * Gets specific calendar type week day name
+   *
+   * @param date the date
+   * @param shortName short or complete day name
+   * @return day name
+   */
+  virtual TQString weekDayName (const ExtDate & date, bool shortName = false) const = 0;
+
+  /**
+   * Gets the first year value supported by specific calendar type
+   * algorithms.
+   *
+   * @return first year supported
+   */
+  virtual int minValidYear () const = 0;
+
+  /**
+   * Gets the maximum year value supported by specific calendar type
+   * algorithms (TQDate, 8000)
+   *
+   * @return maximum year supported
+   */
+  virtual int maxValidYear () const = 0;
+
+  /**
+   * Gets the day of the week traditionaly associated with pray
+   *
+   * @return day number
+   */
+  virtual int weekDayOfPray () const = 0;
+
+  /**
+   * Gets the string representing the calendar
+   */
+  virtual TQString calendarName() const = 0;
+
+  /**
+   * Gets if the calendar is lunar based
+   *
+   * @return if the calendar is lunar based
+   */
+  virtual bool isLunar() const = 0;
+
+  /**
+   * Gets if the calendar is lunisolar based
+   *
+   * @return if the calendar is lunisolar based
+   */
+  virtual bool isLunisolar() const = 0;
+
+  /**
+   * Gets if the calendar is solar based
+   *
+   * @return if the calendar is solar based
+   */
+  virtual bool isSolar() const = 0;
+
+protected:
+  const KLocale * locale() const;
+
+private:
+  ExtCalendarSystemPrivate * d;
+};
+
+#endif