Date.h

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/*
 * Date.h
 *
 * Smalltalk like class library for C++
 * Date manipulation. Header.
 *
 * Copyright (c) 2005 Milan Cermak
 * This class is based on K. E. Gorlen's NIHCL library implementation
 */
/*
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
#ifndef __DATE_H
#define __DATE_H

#include <stlib/Object.h>

namespace Core {

class String;
class Stream;

class Date : public Object // : public Magnitude
{
  protected:
    unsigned long julian_day_number;   // Not same as Julian date.
                    // Jan. 29, 1988 is not the same as 88029 in Julian Day Number.

  private:
    Date(unsigned long julianDate);

  public:
    Date(int month = 1, int day = 1, int year = 1900);

    /* Class-accessing protocol */
    virtual String *className(void) const;

    /* Instance creation protocol */
    static Date *today(void);

    /* Accessing protocol */
    virtual int month(void) const;
    virtual int day(void) const;
    virtual int year(void) const;
    virtual int weekday(void) const;
    virtual int century(void) const;

    static int daysInMonth(int month, int year);

    /* Arithmetics protocol */
    virtual Date *addDays(int dayCount);
    virtual Date *addMonths(int monthCount);
    virtual Date *addYears(int yearCount);

    virtual Date *subtractDays(int dayCount);
    virtual Date *subtractMonths(int monthCount);
    virtual Date *subtractYears(int yearCount);

    virtual unsigned long dayDifferenceFrom(Date *date);

    /* Comparing protocol */
    virtual long hash(void) const;
    virtual bool isEqual(const Object *object) const;
    virtual bool isEqual(const Object &object) const
      { return Object::isEqual(object); }

    /* Converting protocol */
    virtual unsigned long asDays(void) const;

    /* Printing protocol */
    virtual void printOn(Stream *stream) const;

    /* Testing protocol */
    virtual bool isLeapYear(void) const;
    static bool isLeapYear(short year);

    /* private protocol */
  protected:
    static unsigned long julianDay(int month, int day, int year);
    void gregorianDate(int &month, int &day, int &year) const;
};

};

#endif /* __DATE_H */

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