Crontab.h

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/* -*- c++ -*-
 * Copyright (C) 2007-2015 Hypertable, Inc.
 *
 * This file is part of Hypertable.
 *
 * Hypertable is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 3
 * of the License, or any later version.
 *
 * Hypertable 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 */


#ifndef Common_Crontab_h
#define Common_Crontab_h

#include "String.h"

#include <bitset>
#include <ctime>

namespace Hypertable {


  struct crontab_entry {
    std::bitset<60> minute;
    std::bitset<24> hour;
    std::bitset<31> dom;
    std::bitset<12> month;
    std::bitset<8>  dow;
  };

  class Crontab {
  public:

    Crontab() { };

    Crontab(const String &spec);

    time_t next_event(time_t now);

    crontab_entry &entry() { return m_entry; }

  private:

    void next_matching_day(struct tm *next_tm, bool increment);

    void parse_entry(const String &spec, crontab_entry *_entry);

    template <int N> void parse_range(const String &spec, std::bitset<N> &bits,
            bool zero_based = true);

    crontab_entry m_entry;
  };

  std::ostream &operator<<(std::ostream &os, const crontab_entry &entry);

  template <int N> void reconstruct_spec(const std::bitset<N> &bits,
            String &spec);


} // namespace Hypertable

#endif // Common_Crontab_h