Jeep/JDate.hh

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#ifndef __JEEP__JDATE__
#define __JEEP__JDATE__

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

#include "JLang/JComparable.hh"

#include "Jeep/JPrint.hh"


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

namespace JEEP {

  /**
   * Auxiliary class for simple date.
   *
   * The corresponding ASCII format is <tt>yyyy<separator>mm<separator>dd</tt>.
   * where the separator is defined by the template parameter.
   */
  template<char JSeparator_t>
  struct JDate :
    public JLANG::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>::max(),  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;

      object = JDate();

      string buffer;

      if (in >> buffer) {

        for (string::iterator i = buffer.begin(); i != buffer.end(); ++i) {
          if (*i == JDate::SEPARATOR) {
            *i = ' ';
          }
        }

        istringstream is(buffer);

        if (! (is >> object.year >> object.month >> object.day)) {
          in.setstate(is.rdstate());
        }
      }

      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