Class: Samin::Money

Inherits:
Object
  • Object
show all
Defined in:
lib/samin/money.rb

Overview

Money class that implements required features for currency conversion

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(amount = 0, currency = 'CHF') ⇒ Money

Returns a new instance of Money.



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# File 'lib/samin/money.rb', line 8

def initialize(amount = 0, currency = 'CHF')
  @amount   = amount
  @currency = currency
end

Instance Attribute Details

#amount ⇒ Object (readonly)

Returns the value of attribute amount.



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# File 'lib/samin/money.rb', line 6

def amount
  @amount
end

#currency ⇒ Object (readonly)

Returns the value of attribute currency.



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# File 'lib/samin/money.rb', line 6

def currency
  @currency
end

#currency_ref_conversion_rates=(value) ⇒ Object (writeonly)

Sets the attribute currency_ref_conversion_rates

Parameters:

  • value —

    the value to set the attribute currency_ref_conversion_rates to.



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# File 'lib/samin/money.rb', line 5

def currency_ref_conversion_rates=(value)
  @currency_ref_conversion_rates = value
end

#currency_ref_name=(value) ⇒ Object (writeonly)

Sets the attribute currency_ref_name

Parameters:

  • value —

    the value to set the attribute currency_ref_name to.



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# File 'lib/samin/money.rb', line 5

def currency_ref_name=(value)
  @currency_ref_name = value
end

Class Method Details

.conversion_rates(currency_name = 'EUR', rates = {}) ⇒ Object 



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# File 'lib/samin/money.rb', line 80

def self.conversion_rates(currency_name = 'EUR', rates = {})
  unless currency_name.nil? || rates.nil?
    @@currency_ref_name ||= currency_name
    @@currency_ref_conversion_rates ||= rates
    return true
  end
  false
end

Instance Method Details

#*(other) ⇒ Object 



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# File 'lib/samin/money.rb', line 49

def *(other)
  Money.new((@amount * other).to_f, @currency)
end

#+(other) ⇒ Object 



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# File 'lib/samin/money.rb', line 23

def +(other)
  sum = -1
  if other.currency.eql? @currency
    sum = @amount + other.amount
  else
    other_converted = other.convert_from(other.currency)
    sum = other_converted.amount + @amount
  end
  Money.new(sum, @@currency_ref_name)
end

#-(other) ⇒ Object 



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# File 'lib/samin/money.rb', line 34

def -(other)
  sub = -1
  if other.currency.eql? @currency
    sub = @amount - other.amount
  else
    other_converted = other.convert_from(other.currency)
    sub = @amount - other_converted.amount
  end
  Money.new(sub, @@currency_ref_name)
end

#/(other) ⇒ Object 



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# File 'lib/samin/money.rb', line 45

def /(other)
  Money.new((@amount / other).to_f, @currency)
end

#<(other) ⇒ Object 



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# File 'lib/samin/money.rb', line 62

def <(other)
  if other.currency.eql? @currency
    return @amount < other.amount.round(2)
  else
    other_converted = other.convert_from(@currency)
    return @amount < other_converted.amount.round(2)
  end
end

#==(other) ⇒ Object 



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# File 'lib/samin/money.rb', line 53

def ==(other)
  if other.currency.eql? @currency
    return other.amount.round(2).eql? @amount.round(2)
  else
    return other.convert_to(@currency)
      .amount.round(2).eql? @amount.round(2)
  end
end

#>(other) ⇒ Object 



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# File 'lib/samin/money.rb', line 71

def >(other)
  if other.currency.eql? @currency
    return @amount > other.amount.round(2)
  else
    other_converted = other.convert_from(@currency)
    return @amount > other_converted.amount.round(2)
  end
end

#convert_from(currency) ⇒ Object 



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# File 'lib/samin/money.rb', line 89

def convert_from(currency)
  rate = @@currency_ref_conversion_rates[currency]
  Money.new((@amount / rate).to_f.round(2), currency)
end

#convert_to(currency) ⇒ Object 



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# File 'lib/samin/money.rb', line 17

def convert_to(currency)
  rate = @@currency_ref_conversion_rates[currency]
  return nil if rate.nil?
  Money.new((@amount * rate).to_f.round(2), currency)
end

#inspect ⇒ Object 



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# File 'lib/samin/money.rb', line 13

def inspect
  "#{@amount} #{@currency}"
end