Class: NbrbCurrency

Inherits:
Money::Bank::VariableExchange
  • Object
show all
Defined in:
lib/nbrb_currency.rb

Constant Summary collapse

NBRB_RATES_URL = 
'http://nbrb.by/Services/XmlExRates.aspx'
CURRENCIES = 
%w(AUD BGN UAH DKK USD EUR PLN JPY IRR ISK CAD CNY KWD LVL LTL MDL NOK RUB SGD KGS KZT TRY GBP CZK SEK CHF)

Instance Method Summary collapse

Instance Method Details

#exchange(cents, from_currency, to_currency) ⇒ Object 



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# File 'lib/nbrb_currency.rb', line 32

def exchange(cents, from_currency, to_currency)
  exchange_with(Money.new(cents, from_currency), to_currency)
end

#exchange_with(from, to_currency) ⇒ Object 



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# File 'lib/nbrb_currency.rb', line 36

def exchange_with(from, to_currency)
  rate = get_rate(from.currency, to_currency)
  unless rate
    from_base_rate = get_rate(from.currency, "BYR")
    to_base_rate = get_rate(to_currency, "BYR")
    rate = (BigDecimal.new(from_base_rate, 8) / BigDecimal.new(to_base_rate, 8)).to_f
    raise "Rate #{from.currency} - #{to_currency} unknown!" unless rate
  end
  Money.new(((Money::Currency.wrap(to_currency).subunit_to_unit.to_f / from.currency.subunit_to_unit.to_f) * from.cents * rate).round, to_currency)
end

#save_rates(cache) ⇒ Object

Raises:



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# File 'lib/nbrb_currency.rb', line 24

def save_rates(cache)
  raise InvalidCache if !cache
  File.open(cache, "w") do |file|
    io = open(NBRB_RATES_URL) ;
    io.each_line {|line| file.puts line}
  end
end

#update_rates(cache = nil) ⇒ Object 



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# File 'lib/nbrb_currency.rb', line 13

def update_rates(cache=nil)
  exchange_rates(cache).each do |exchange_rate|
    rate = exchange_rate.xpath("Rate").text
    currency = exchange_rate.xpath("CharCode").text
    scale = exchange_rate.xpath("Scale").text
    next if currency == "XDR"
    add_rate(currency, "BYR", (BigDecimal.new(rate) / BigDecimal.new(scale)).to_f)
  end
  add_rate("BYR", "BYR", 1)
end