Source Code for Module eoxserver.core.util.timetools

  1  #------------------------------------------------------------------------------- 
  2  # $Id: timetools.py 1527 2012-03-14 15:46:56Z schindlerf $ 
  3  # 
  4  # Project: EOxServer <http://eoxserver.org> 
  5  # Authors: Stephan Krause <stephan.krause@eox.at> 
  6  #          Stephan Meissl <stephan.meissl@eox.at> 
  7  # 
  8  #------------------------------------------------------------------------------- 
  9  # Copyright (C) 2011 EOX IT Services GmbH 
 10  # 
 11  # Permission is hereby granted, free of charge, to any person obtaining a copy 
 12  # of this software and associated documentation files (the "Software"), to deal 
 13  # in the Software without restriction, including without limitation the rights 
 14  # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell  
 15  # copies of the Software, and to permit persons to whom the Software is  
 16  # furnished to do so, subject to the following conditions: 
 17  # 
 18  # The above copyright notice and this permission notice shall be included in all 
 19  # copies of this Software or works derived from this Software. 
 20  # 
 21  # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 
 22  # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
 23  # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 
 24  # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
 25  # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 
 26  # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 
 27  # THE SOFTWARE. 
 28  #------------------------------------------------------------------------------- 
 29   
 30  import re 
 31  from datetime import datetime, tzinfo, timedelta 
 32   
 33  from eoxserver.core.exceptions import InvalidParameterException 
 34   
 35  # pre-compile the regular expression for date/time matching 
 36   
 37  date_regex = r"(?P<year>\d{4})[-]?(?P<month>\d{2})[-]?(?P<day>\d{2})" 
 38  time_regex = r"(?P<hour>\d{2})(:?(?P<minute>\d{2})(:?(?P<second>\d{2}))?)?" 
 39  tz_regex = r"(?P<tz_expr>Z|(?P<tz_sign>[+-])(?P<tz_hours>\d{2}):?(?P<tz_minutes>\d{2})?)?" 
 40  datetime_regex = date_regex + r"(T" + time_regex + tz_regex + ")?" 
 41   
 42  datetime_regex_obj = re.compile(datetime_regex) 
 43   
 44 -class UTCOffsetTimeZoneInfo(tzinfo): 
 45 -    def __init__(self): 
 46          super(UTCOffsetTimeZoneInfo, self).__init__ 
 47           
 48          self.offset_td = timedelta() 
 49       
 50 -    def setOffsets(self, offset_sign, offset_hours, offset_minutes): 
 51          if offset_sign == "+": 
 52              self.offset_td = timedelta(hours = offset_hours, minutes = offset_minutes) 
 53          else: 
 54              self.offset_td = timedelta(hours = -offset_hours, minutes = -offset_minutes) 
 55       
 56 -    def utcoffset(self, dt): 
 57          return self.offset_td 
 58       
 59 -    def dst(self, dt): 
 60          return timedelta() 
 61       
 62 -    def tzname(self, dt): 
 63          return None 
 64   
 65 -def _convert(s): 
 66      if s is None: 
 67          return 0 
 68      else: 
 69          return int(s) 
 70   
 71 -def getDateTime(s): 
 72      match = datetime_regex_obj.match(s) 
 73      if match is None: 
 74          raise InvalidParameterException( 
 75              "'%s' does not match any known datetime format." % s 
 76          ) 
 77       
 78      year = int(match.group("year")) 
 79      month = int(match.group("month")) 
 80      day = int(match.group("day")) 
 81       
 82      hour = _convert(match.group("hour")) 
 83      minute = _convert(match.group("minute")) 
 84      second = _convert(match.group("second")) 
 85       
 86      if match.group("tz_expr") in (None, "Z"): 
 87          offset_sign = "+" 
 88          offset_hours = 0 
 89          offset_minutes = 0 
 90      else: 
 91          offset_sign = match.group("tz_sign") 
 92          offset_hours = _convert(match.group("tz_hours")) 
 93          offset_minutes = _convert(match.group("tz_minutes")) 
 94           
 95      tzi = UTCOffsetTimeZoneInfo() 
 96      tzi.setOffsets(offset_sign, offset_hours, offset_minutes) 
 97       
 98      try: 
 99          dt = datetime(year, month, day, hour, minute, second, 0, tzi) 
100      except ValueError: 
101          raise InvalidParameterException("Invalid date/time '%s'" % s) 
102       
103      utc = UTCOffsetTimeZoneInfo() 
104      utct = dt.astimezone(utc) 
105       
106      return utct 
107   
108 -def isotime(dt): 
109      return dt.strftime("%Y-%m-%dT%H:%M:%SZ") 
110