Class: BBCWeather

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

Class Method Summary collapse

Class Method Details

.city(city_id) ⇒ Object 



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# File 'lib/bbc_weather.rb', line 10

def self.city(city_id)
  result = {}

  if city_id.is_a?(Integer) || city_id =~ /^[0-9]+$/
    begin
      result = get_weather_from_bbc_url("http://www.bbc.co.uk/weather/en/#{city_id}")
    rescue ArgumentError => e
      if e.to_s[/404/]
        raise ArgumentError, "City ID: #{city_id} not found"
      end
      raise
    end
  else
    # Convert string location to integer city code
    city_ids = BBCWeather.get_city_id(city_id)

    if city_ids.length == 0
      raise ArgumentError, "City ID: '#{city_id}' could not be located"
    elsif city_ids.length > 1
      raise ArgumentError, "City ID: '#{city_id}' returned more than one matching city (#{city_ids}). Please refine your search term"
    else
      # Recursive call using integer city code
      return BBCWeather.city(city_ids[0]["id"])
    end
  end
  return result
end

.get_city_id(city_name) ⇒ Object 



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# File 'lib/bbc_weather.rb', line 38

def self.get_city_id(city_name)
  city_name_d = city_name.downcase
  city_ids = JSON.parse(Net::HTTP.get(URI("http://www.bbc.co.uk/locator/default/en-GB/autocomplete.json?search=#{city_name_d}&filter=international")))
  city_id = city_ids.select {|a| a["fullName"].downcase.eql?(city_name_d) || a["fullName"].downcase.eql?("#{city_name_d}, #{city_name_d}") || a["fullName"].downcase.eql?("#{city_name_d}, #{city_name_d} city") }

  city_id.empty? ? (return city_ids) : (return city_id)
end

.get_weather_from_bbc_url(url) ⇒ Object 



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# File 'lib/bbc_weather.rb', line 46

def self.get_weather_from_bbc_url(url)
  html = {}
  html[:main] = Nokogiri::HTML(Net::HTTP.get(URI(url)))

  if html[:main].css("title")[0].children[0].text[/not found/i]
    raise ArgumentError, "The given URL returned a 404 error. Please check the city ID and try again"
  end

  lock = Mutex.new
  connections = []
  html[:main].css("div.daily-window > ul > li > a").each do |day|
     connections << Thread.new {
       day_url = day.attributes["data-ajax-href"].value
       day_html = Nokogiri::HTML(Net::HTTP.get(URI("http://www.bbc.co.uk#{day_url}")))
       lock.synchronize {
         html[day_url[/[0-9]+$/].to_i] = day_html
       }
     }
  end
  connections.each {|conn| conn.join}

  return WeatherResult.new(html)
end

.set_units(*units) ⇒ Object 



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# File 'lib/bbc_weather.rb', line 70

def self.set_units(*units)
  curr_units = self.units
  count = {:temp => 0, :speed => 0}

  units.each do |u|
    if u == "c" || u == "celcius"
      $temp_unit = "c"
      count[:temp] += 1
    elsif u == "f" || u == "fahrenheit"
      $temp_unit = "f"
      count[:temp] += 1
    elsif u == "kph" || u == "km/h"
      $speed_unit = "kph"
      count[:speed] += 1
    elsif u == "mph"
      $speed_unit = "mph"
      count[:speed] += 1
    else
      $temp_unit = curr_units[0]
      $speed_unit = curr_units[1]
      raise ArgumentError, "'#{u}' is not a recognised unit of speed/temperature. Unit must be either 'c' or 'f' (celcius or fahrenheit), or 'kph' or 'mph' (kilometers per hour or miles per hour). Units have not been changed"
    end
  end
  if count[:temp] > 1 || count[:speed] > 1
    $temp_unit = curr_units[0]
    $speed_unit = curr_units[1]
    raise ArgumentError, "Cannot pass in two units of the same type (i.e. #set_units('kph', 'mph')). Units have not been changed"
  end

  return [$temp_unit, $speed_unit]
end

.units ⇒ Object 



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# File 'lib/bbc_weather.rb', line 102

def self.units
  return [$temp_unit, $speed_unit]
end