Class: Ullr::Forecast

Inherits:
Object
  • Object
show all
Defined in:
lib/ullr/forecast.rb

Constant Summary collapse

NOAA_ENDPOINT = 
"http://forecast.weather.gov/MapClick.php?lat={{lat}}&lon={{lon}}&FcstType=dwml"

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options = {}) ⇒ Forecast

Returns a new instance of Forecast.



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# File 'lib/ullr/forecast.rb', line 8

def initialize(options={})
  [:lat,:lon].each do |o|
   raise(ArgumentError, "#{o.to_s} is required!") if !options[o] || !options[o].instance_of?(Float)
  end
  @lat = options[:lat]
  @lon = options[:lon]
  @noaa_endpoint = NOAA_ENDPOINT.gsub("{{lat}}",@lat.to_s).gsub("{{lon}}",@lon.to_s)
end

Instance Attribute Details

#data ⇒ Object

Returns the value of attribute data.



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# File 'lib/ullr/forecast.rb', line 5

def data
  @data
end

#forecast_string ⇒ Object

Returns the value of attribute forecast_string.



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# File 'lib/ullr/forecast.rb', line 5

def forecast_string
  @forecast_string
end

#lat ⇒ Object

Returns the value of attribute lat.



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# File 'lib/ullr/forecast.rb', line 5

def lat
  @lat
end

#lon ⇒ Object

Returns the value of attribute lon.



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# File 'lib/ullr/forecast.rb', line 5

def lon
  @lon
end

#noaa_endpoint ⇒ Object

Returns the value of attribute noaa_endpoint.



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# File 'lib/ullr/forecast.rb', line 5

def noaa_endpoint
  @noaa_endpoint
end

#parsed_forecast ⇒ Object

Returns the value of attribute parsed_forecast.



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# File 'lib/ullr/forecast.rb', line 5

def parsed_forecast
  @parsed_forecast
end

#socket_error ⇒ Object

Returns the value of attribute socket_error.



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# File 'lib/ullr/forecast.rb', line 5

def socket_error
  @socket_error
end

Instance Method Details

#get_noaa_forecast ⇒ Object 



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# File 'lib/ullr/forecast.rb', line 33

def get_noaa_forecast
  @socket_error = false
  @data = []
  begin
    resp = open(@noaa_endpoint)
    @forecast_string = resp.read
  rescue SocketError
    @socket_error = true
  end
  if !@socket_error
    data = Ullr::NOAA::Data.parse(@forecast_string)
    forecast = data.find{|o| o.type == 'forecast'}
    @parsed_forecast = forecast
    if forecast
      time_layout = forecast.time_layouts.find{|t| t.layout_key =~ /k-p12h/ }
      temperature_data = parse_temps
      time_layout.start_valid_times.each_with_index do |time,i|
        params = forecast.parameters
        word = params.worded_forecast.texts[i]
        min_temp = temperature_data ? temperature_data[:minimum].find{|t| t.period_name =~ /#{time.period_name}/} : false
        max_temp = temperature_data ? temperature_data[:maximum].find{|t| t.period_name =~ /#{time.period_name}/} : false
        point = OpenStruct.new
        point.start_time = time.period_start
        point.name = time.period_name
        point.pop = params.pops.values[i].value
        point.text = word.value
        point.snow = word.has_snow?
        point.high_temperature = max_temp ? max_temp.temperature : nil
        point.low_temperature = min_temp ? min_temp.temperature : nil
        point.wind_direction = word.wind_direction
        point.wind_speeds = word.wind_speeds
        point.snow_estimate = word.snow_estimate
        @data << point
      end
    end
  end
  return @data
end

#parse_temps ⇒ Object 



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# File 'lib/ullr/forecast.rb', line 17

def parse_temps
  temps = {:minimum => [], :maximum => []}
  @parsed_forecast.parameters.temperatures.each do |temp_data|
    time_layout = @parsed_forecast.time_layouts.find{|t| t.layout_key =~ /#{temp_data.time_layout}/ }
    temp_data.values.each_with_index do |temperature, i|
      data = OpenStruct.new
      time = time_layout.start_valid_times[i]
      data.temperature = temperature.value
      data.start_time = time.period_start
      data.period_name = time.period_name
      temps[temp_data.type.to_sym] << data
    end
  end
  return temps
end