Jeep/JDate.hh

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#ifndef __JEEP__JDATE__
#define __JEEP__JDATE__

#include <string>
#include <istream>
#include <ostream>
#include <sstream>
#include <cctype>
#include <limits>

#include "JLang/JComparable.hh"
#include "JLang/JWhiteSpacesFacet.hh"

#include "Jeep/JPrint.hh"


/**
 * \author mdejong
 */
namespace JEEP {}
namespace JPP { using namespace JEEP; }

namespace JEEP {

  using JLANG::JComparable;


  /**
   * Auxiliary class for simple date.
   *
   * The corresponding ASCII format is <tt>yyyy<separator>mm<separator>dd</tt>,\n
   * where
   * <tt>yyyy</tt> corresponds to the year,
   * <tt>mm</tt> to the month and
   * <tt>dd</tt> to the day.\n
   * The separator is defined by the template parameter.
   */
  template<char JSeparator_t>
  struct JDate :
    public JComparable< JDate<JSeparator_t> >
  {
    /**
     * Separation character.
     */
    static const char SEPARATOR = JSeparator_t;
    

    /**
     * Default constructor.
     */
    JDate() :
      year (0),
      month(0),
      day  (0)
    {}


    /**
     * Constructor.
     *
     * \param  year       year
     * \param  month      month
     * \param  day        day
     */
    JDate(const int year,
          const int month,
          const int day) :
      year (year),
      month(month),
      day  (day)
    {}


    /**
     * Constructor.
     *
     * \param  date       date
     */
    JDate(const std::string& date)
    {
      std::istringstream in(date);

      in >> *this;
    }


    static JDate min() { return JDate(std::numeric_limits<int>::lowest(),  1,  1); }  //!< Minimal date
    static JDate max() { return JDate(std::numeric_limits<int>::max(),    12, 31); }  //!< Maximal date


    /**
     * Less-than method.
     *
     * \param  date          date
     * \return               true if this date earlier than given date; else false
     */
    bool less(const JDate& date) const
    {
      if (this->year == date.year) {

        if (this->month == date.month)
          return this->day   < date.day;
        else
          return this->month < date.month;

      } else {

        return this->year < date.year;
      }
    }


    /**
     * Read date from input stream.
     *
     * \param  in         input stream
     * \param  object     date
     * \return            input stream
     */
    friend inline std::istream& operator>>(std::istream& in, JDate& object)
    {
      using namespace std;
      using namespace JPP;

      object = JDate();

      while (isspace(in.peek())) { in.ignore(); }

      const locale loc = in.imbue(locale(in.getloc(), new JWhiteSpacesFacet(in.getloc(), JDate::SEPARATOR)));

      in >> object.year >> object.month >> object.day;

      in.imbue(loc);

      return in;
    }


    /**
     * Write date to output stream.
     *
     * \param  out        output stream
     * \param  object     date
     * \return            output stream
     */
    friend inline std::ostream& operator<<(std::ostream& out, const JDate& object)
    {
      return out << FILL(4,'0') << object.year  << JDate::SEPARATOR
                 << FILL(2,'0') << object.month << JDate::SEPARATOR
                 << FILL(2,'0') << object.day   << FILL();
    }


    int year;              //!< year
    int month;             //!< month
    int day;               //!< day
  };
}

#endif