Class: Timeshifter

Inherits:
Object
  • Object
show all
Defined in:
lib/timeshifter.rb,
lib/timeshifter/version.rb

Constant Summary collapse

VERSION = 
"0.1.1"

Instance Method Summary collapse

Constructor Details

#initialize(ranges) ⇒ Timeshifter

Initializes an object that will shift time within a valid set of ranges.

ranges - A list of ranges to shift time within.



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# File 'lib/timeshifter.rb', line 16

def initialize(ranges)
  raise "Ranges are required" if ranges.nil?
  @ranges = ranges.compact.sort {|x,y| x.begin <=> y.begin}
end

Instance Method Details

#ranges ⇒ Object

The list of valid ranges.



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# File 'lib/timeshifter.rb', line 29

def ranges
  Array.new(@ranges)
end

#shift(time) ⇒ Object

Shifts the time to a valid time in the day based on the ranges provided.

time - The time to shift.

Returns a time that is within the valid ranges.



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# File 'lib/timeshifter.rb', line 45

def shift(time)
  return nil if time.nil?
  
  # Check if it's UTC
  is_utc = time.utc?
  
  # Determine the total available seconds from the ranges.
  tsec = (total_hours * 3600).to_f
  raise "No hours available to shift within" if tsec == 0
  
  # Determine original seconds in time for the day
  osec = ((time.hour*3600) + (time.min*60) + time.sec).to_f

  # Determine time shifted seconds in time for the day
  sec  = osec * (tsec/86400)
  
  # Work through ranges and compact time
  current = 0.0
  ranges.each do |range|
    rsec = ((range.end - range.begin) * 3600).to_f
    
    # If time time is within this range calculate the position
    if sec < current+rsec
      shifted_time = Time.at(time.to_i - osec.to_i + (range.begin*3600)+(sec-current).to_i)

      # Return UTC if that's what was passed in
      if is_utc
        shifted_time = shifted_time.getutc()
      end
      
      return shifted_time
    end

    # Add range second total to current seconds
    current += rsec
  end
  
  # We should have been able to shift within a range by now
  raise "Time could not be shifted inside range: #{osec} #{sec} #{current}"
end

#total_hours ⇒ Object

Calculates the total hours available based on the ranges provided.



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# File 'lib/timeshifter.rb', line 87

def total_hours
  total = 0

  # Calculate total
  ranges.each do |range|
    total += range.end - range.begin
  end
  
  return total
end