Module: Exchanges::Rates

Included in:
Nbp
Defined in:
lib/exchanges/rates.rb

Constant Summary collapse

NBP = 
'http://www.nbp.pl/kursy/xml/'

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#date ⇒ Object

Returns the value of attribute date.



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# File 'lib/exchanges/rates.rb', line 10

def date
  @date
end

#selected_currencies ⇒ Object

Returns the value of attribute selected_currencies.



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# File 'lib/exchanges/rates.rb', line 10

def selected_currencies
  @selected_currencies
end

Instance Method Details

#codes ⇒ Object 



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# File 'lib/exchanges/rates.rb', line 14

def codes
  res = xml.xpath("//pozycja/kod_waluty/text()").map {|c| c.to_s }
  @selected_currencies.empty? ? res : res.select {|c| @selected_currencies.include?(c)}
end

#filename ⇒ Object 



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# File 'lib/exchanges/rates.rb', line 32

def filename
  # according to: http://www.nbp.pl/home.aspx?f=/kursy/instrukcja_pobierania_kursow_walut.html
  index = Net::HTTP.get(URI.parse(NBP + 'dir.txt'))

  while index[/(a[0-9][0-9][0-9]z#{@date.strftime("%y%m%d")}+)/, 1].nil? do
    @date -= 1
  end
  index[/(a[0-9][0-9][0-9]z#{@date.strftime("%y%m%d")}+)/, 1]
end

#published_at ⇒ Object 



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# File 'lib/exchanges/rates.rb', line 28

def published_at
  Date.parse(xml.xpath("//tabela_kursow/data_publikacji/text()").to_s)
end

#rates(currency) ⇒ Object 



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# File 'lib/exchanges/rates.rb', line 19

def rates(currency)
  rate = {}
  rate[:symbol] = xml.xpath("//pozycja[kod_waluty='#{currency}']/kod_waluty/text()").to_s
  rate[:name] = xml.xpath("//pozycja[kod_waluty='#{currency}']/nazwa_waluty/text()").to_s.force_encoding('iso-8859-2').encode('utf-8')
  rate[:base] = xml.xpath("//pozycja[kod_waluty='#{currency}']/przelicznik/text()").to_s.gsub(',', '.').to_f
  rate[:average_rate] = xml.xpath("//pozycja[kod_waluty='#{currency}']/kurs_sredni/text()").to_s.gsub(',', '.').to_f
  rate
end

#url ⇒ Object 



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# File 'lib/exchanges/rates.rb', line 42

def url
  File.join(NBP, filename + '.xml') if filename
end

#xml ⇒ Object 



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# File 'lib/exchanges/rates.rb', line 46

def xml
  begin
    doc = open(url)
  rescue Exception => e
    puts e.message
    puts e.backtrace.inspect
  end

  Nokogiri::HTML(doc) if doc
end