Module: ADIWG::Mdtranslator::Readers::Fgdc::DateTime

Defined in:
lib/adiwg/mdtranslator/readers/fgdc/modules/module_dateTime.rb

Class Method Summary collapse

Class Method Details

.unpack(date, time, hResponseObj) ⇒ Object 



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# File 'lib/adiwg/mdtranslator/readers/fgdc/modules/module_dateTime.rb', line 19

def self.unpack(date, time, hResponseObj)

   # instance classes needed in script
   intMetadataClass = InternalMetadata.new
   hDateTime = intMetadataClass.newDateTime

   if date.nil? || date == ''
      hResponseObj[:readerExecutionMessages] << 'ERROR: FGDC reader: date missing from dateTime creation'
      hResponseObj[:readerExecutionPass] = false
      return nil
   end

   # remove invalid date and time input strings
   unless date =~ /^[0-9\-]*$/
      return nil
   end
   unless time =~ /^[0-9:]*$/
      time = ''
   end

   # determine if date/time is universal (default) or local
   zoneFlag = Fgdc.get_metadata_time_convention
   zoneFlag = 'universal time' if zoneFlag.nil? || zoneFlag == ''

   # convert date from fgdc to iso format
   year = date.byteslice(0,4)
   month = date.byteslice(4,2)
   day = date.byteslice(6,2)

   haveFullDate = false
   dtIn = year
   unless month.nil? || month == ''
      dtIn += '-' + month
      unless day.nil? || day == ''
         dtIn += '-' + day
         haveFullDate = true
      end
   end

   # if have full date and some time expression
   # add time element to date string
   if haveFullDate
      unless time == ''
         aScan = time.scan(/:/)
         if aScan.empty?
            hour = time.byteslice(0,2)
            minute = time.byteslice(2,2)
            second = time.byteslice(4,2)
         else
            aTime = time.split(':')
            hour = aTime[0]
            minute = aTime[1]
            second = aTime[2]
         end

         # all times must include timezone
         # timezone format requires hours, minutes, and seconds
         hour = '00' if hour.nil? || hour == ''
         minute = '00' if minute.nil? || minute == ''
         second = '00' if second.nil? || second == ''
         tmIn = 'T' + hour + ':' + minute + ':' + second

         dtIn += tmIn

         # add offset to date/time string
         if zoneFlag == 'universal time'
            dtIn = dtIn + '+00:00'
         else
            timeOffset = Time.now.gmt_offset
            aOffset = timeOffset.divmod(3600)
            hourOff = aOffset[0]
            minOff = aOffset[1] * 60
            if hourOff >= 0
               zone = '+' + '%02d' % hourOff + ':' + '%02d' % minOff
            else
               zone = '%03d' % hourOff + ':' + '%02d' % minOff
            end
            dtIn = dtIn + zone
         end

      end
   end

   # if dateTimeFromString fails, [0] = nil; [1] = 'ERROR'
   aDateTimeReturn = AdiwgDateTimeFun.dateTimeFromString(dtIn)
   if aDateTimeReturn[1] == 'ERROR'
      hResponseObj[:readerExecutionMessages] << 'ERROR: FGDC reader: Conversion of dateTime string to object failed'
      hResponseObj[:readerExecutionPass] = false
      return nil
   end

   # always output 'universal time'
   if zoneFlag == 'universal time'
      utc = aDateTimeReturn[0]
   else
      utc = aDateTimeReturn[0].new_offset(Rational(0,24))
   end

   # build internal dateTime object
   hDateTime[:dateTime] = utc
   hDateTime[:dateResolution] = aDateTimeReturn[1]

   return hDateTime

end