Class: ISO4217::Currency::ExchangeBank

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

Constant Summary collapse

@@singleton = 
ExchangeBank.new

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ ExchangeBank

Returns a new instance of ExchangeBank.



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# File 'lib/currencies/exchange_bank.rb', line 9

def initialize
  @rates = {}
  @mutex = Mutex.new
end

Class Method Details

.instance ⇒ Object 



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# File 'lib/currencies/exchange_bank.rb', line 5

def self.instance
  @@singleton
end

Instance Method Details

#add_rate(from, to, rate) ⇒ Object 



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# File 'lib/currencies/exchange_bank.rb', line 14

def add_rate(from, to, rate)
  @mutex.synchronize do
    @rates["#{from}_TO_#{to}".upcase] = rate
  end
end

#exchange(cents, from_currency, to_currency) ⇒ Object 



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# File 'lib/currencies/exchange_bank.rb', line 30

def exchange(cents, from_currency, to_currency)
  rate = get_rate(from_currency, to_currency)
  if rate
    (cents * rate).floor
  else
    from_currency = ISO4217::Currency.from_code(from_currency)
    to_currency = ISO4217::Currency.from_code(to_currency)
            
    if from_currency && to_currency && from_currency.exchange_rate && to_currency.exchange_rate && (from_currency.exchange_currency == to_currency.exchange_currency)
      ((cents * from_currency.exchange_rate) / to_currency.exchange_rate).floor
    else
      raise Money::UnknownRate, "No conversion rate known for '#{from_currency}' -> '#{to_currency}'"
    end
  end
end

#get_rate(from, to) ⇒ Object 



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# File 'lib/currencies/exchange_bank.rb', line 20

def get_rate(from, to)
  @mutex.synchronize do
    @rates["#{from}_TO_#{to}".upcase] 
  end
end

#same_currency?(currency1, currency2) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/currencies/exchange_bank.rb', line 26

def same_currency?(currency1, currency2)
  currency1.upcase == currency2.upcase
end