Class: Knj::Exchangerates

Inherits:
Object show all
Defined in:
lib/knj/exchangerates.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(args = {}) ⇒ Exchangerates

Returns a new instance of Exchangerates.



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# File 'lib/knj/exchangerates.rb', line 4

def initialize(args = {})
  @rates = {}
end

Instance Attribute Details

#rates ⇒ Object (readonly)

Returns the value of attribute rates.



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# File 'lib/knj/exchangerates.rb', line 2

def rates
  @rates
end

Instance Method Details

#add_rate(data) ⇒ Object 



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# File 'lib/knj/exchangerates.rb', line 13

def add_rate(data)
  if !data[:locale] or data[:locale].to_s.length <= 0
    raise "Invalid locale given."
  end
  
  @rates[data[:locale].to_s] = data
end

#base=(data) ⇒ Object 



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# File 'lib/knj/exchangerates.rb', line 8

def base=(data)
  @base = data[:locale].to_s
  self.add_rate(data)
end

#value(locale, floatval) ⇒ Object 



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# File 'lib/knj/exchangerates.rb', line 21

def value(locale, floatval)
  floatval = floatval.to_f
  locale = locale.to_s
  
  raise "No such locale: '#{locale}' in '#{@rates.keys.join(",")}'." if !@rates.key?(locale)
  
  base_rate = @rates[@base][:rate].to_f
  cur_rate = @rates[locale][:rate].to_f
  
  if base_rate == cur_rate
    return floatval 
  elsif cur_rate < base_rate
    diff = 1 + (base_rate - cur_rate)
    return floatval * diff
  else
    return floatval / cur_rate
  end
end