Class: Kisyo::Daily

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

Constant Summary collapse

CACHE_SIZE = 
100

Instance Method Summary collapse

Constructor Details

#initialize(location) ⇒ Daily

Returns a new instance of Daily.



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# File 'lib/kisyo/daily.rb', line 8

def initialize(location)
  @location = location
  @cache = Cache.new
end

Instance Method Details

#at(date) ⇒ Object

Raises:



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# File 'lib/kisyo/daily.rb', line 13

def at(date)
  key = [date.year, date.month, date.day].join(',')

  if value = cache.get(key)
    return value
  end

  url =
    'http://www.data.jma.go.jp/obd/stats/etrn/view/daily_s1.php?prec_no=%s&block_no=%s&year=%i&month=%i&day=01&view=p1' % [
      location.prefecture_id,
      location.block_id,
      date.year,
      date.month
    ]

  content = URI.open(url).read
  doc = Nokogiri.HTML(content)
  days = doc.css('div.a_print')

  raise WeatherInformationNotAvailable if days.size == 0

  days.each do |el|
    tr = el.parent.parent
    values = tr.css('td').map(&:text)

    k = [date.year, date.month, values[0]].join(',')
    cache.set(k, Element::Day.new(*values[1..-1]))
  end

  cache.get(key)
end