SimpleTimeParser.cc

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// This file is part of the "NcML Module" project, a BES module designed
// to allow NcML files to be used to be used as a wrapper to add
// AIS to existing datasets of any format.
//
// Copyright (c) 2009 OPeNDAP, Inc.
// Author: Michael Johnson  <m.johnson@opendap.org>
//
// For more information, please also see the main website: http://opendap.org/
//
// 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
//
// Please see the files COPYING and COPYRIGHT for more information on the GLPL.
//
// You can contact OPeNDAP, Inc. at PO Box 112, Saunderstown, RI. 02874-0112.

#include "SimpleTimeParser.h"

#include <sstream>

using std::map;
using std::string;
using std::istringstream;

namespace agg_util
{
  const long SimpleTimeParser::_sSecsInMin = 60L;
  const long SimpleTimeParser::_sSecsInHour = 60L * SimpleTimeParser::_sSecsInMin;
  const long SimpleTimeParser::_sSecsInDay = 24L * SimpleTimeParser::_sSecsInHour;
  const long SimpleTimeParser::_sSecsInWeek = 7L * SimpleTimeParser::_sSecsInDay;
  const long SimpleTimeParser::_sSecsInMonth = 31L * SimpleTimeParser::_sSecsInDay;
  const long SimpleTimeParser::_sSecsInYear = 365L * SimpleTimeParser::_sSecsInDay;

  map< string, long > SimpleTimeParser::_sParseTable = std::map<string,long>();
  bool SimpleTimeParser::_sInited = false;

  SimpleTimeParser::SimpleTimeParser()
  {
  }

  SimpleTimeParser::~SimpleTimeParser()
  {
  }

  bool
  SimpleTimeParser::parseIntoSeconds(long& seconds, const string& duration)
  {
    bool success = true;

    if (!_sInited)
      {
        initParseTable();
      }

    istringstream iss;
    iss.str(duration);
    iss >> seconds;
    if (iss.fail())
      {
        success = false;
      }
    else // we got the numerical portion, now parse the units.
      {
        string units;
        iss >> units;
        if (iss.fail())
          {
            success = false;
          }
        else
          {
            std::map< std::string, long >::iterator foundIt = _sParseTable.find(units);
            if (foundIt == _sParseTable.end())
              {
                success = false;
              }
            else
              {
                seconds *= foundIt->second;
              }
          }
      }

    if (!success)
      {
        seconds = -1;
      }
    return success;
  }



  void
  SimpleTimeParser::initParseTable()
  {
    /*
     * seconds: { s, sec, secs, second, seconds }
     * minutes: { m, min, mins, minute, minutes }
     * hours: { h, hour, hours }
     * days: { day, days }
     * months: { month, months }
     * years: { year, years }
     */

    _sParseTable["s"] = 1L;
    _sParseTable["sec"] = 1L;
    _sParseTable["secs"] = 1L;
    _sParseTable["second"] = 1L;
    _sParseTable["seconds"] = 1L;

    _sParseTable["m"] = _sSecsInMin;
    _sParseTable["min"] = _sSecsInMin;
    _sParseTable["mins"] = _sSecsInMin;
    _sParseTable["minute"] = _sSecsInMin;
    _sParseTable["minutes"] = _sSecsInMin;

    _sParseTable["h"] = _sSecsInHour;
    _sParseTable["hour"] =  _sSecsInHour;
    _sParseTable["hours"] =  _sSecsInHour;

    _sParseTable["day"] =  _sSecsInDay;
    _sParseTable["days"] =  _sSecsInDay;

    _sParseTable["week"] = _sSecsInWeek;
    _sParseTable["weeks"] = _sSecsInWeek;

    _sParseTable["month"] =  _sSecsInMonth;
    _sParseTable["months"] =  _sSecsInMonth;

    _sParseTable["year"] =  _sSecsInYear;
    _sParseTable["years"] =  _sSecsInYear;

    _sInited = true;
  }

}