Class: Momm::Calculator

Inherits:
Object
  • Object
show all
Extended by:
Forwardable
Defined in:
lib/momm/calculator.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(storage = Memcached.new, feed = Feeds::ECB.instance) ⇒ Calculator

Initialise Storage Object

Parameters:

client

A storage, such as memcached, redis

Returns

self



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# File 'lib/momm/calculator.rb', line 12

def initialize(storage = Memcached.new, feed = Feeds::ECB.instance)
  @storage = storage
  @feed = feed
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(meth, *args, &block) ⇒ Object

@TODO: Refactoring



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# File 'lib/momm/calculator.rb', line 127

def method_missing(meth, *args, &block)
  meth = meth.to_s
  case
  when meth.match(/^exchange_rate_from_(\w+)_to_(\w+)/)
    exchange_rate($1.upcase.to_sym, $2.upcase.to_sym, *args, &block)
  when meth.match(/^exchange_from_(\w+)_to_(\w+)/)
    money, *res = args
    exchange(money, $1.upcase.to_sym, $2.upcase.to_sym, *res, &block)
  else
    super
  end
end

Instance Attribute Details

#feed ⇒ Object (readonly)

Returns the value of attribute feed.



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# File 'lib/momm/calculator.rb', line 17

def feed
  @feed
end

#storage ⇒ Object (readonly)

Returns the value of attribute storage.



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# File 'lib/momm/calculator.rb', line 17

def storage
  @storage
end

Instance Method Details

#exchange(money, from, to, options = {}) ⇒ Object

Exchange Money from one currency to another

Parameters

money

money you have

from

ruby symbol, such as :USD, :GBP

to

same as above

options

option parameters, contain today by default

Returns

money exchanged



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# File 'lib/momm/calculator.rb', line 101

def exchange(money, from, to, options= {})
  options[:date] ||= Date.today
  (origin_exchange_rate(from, to, options) * money).round(2)
end

#exchange_rate(from, to, options = {}) ⇒ Object

Exchange Rate

Parameters

from

ruby symbol, such as :USD, :GBP

to

same as above

options

0ption parameters, contain today by default

Returns

the exchange rate



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# File 'lib/momm/calculator.rb', line 52

def exchange_rate(from, to, options = {})
  origin_exchange_rate(from, to, options = {}).round(2)
end

#get_rate(from, date = Date.today) ⇒ Object

Delegate the get_rate method, if the target is missing Fetching all data from remote

Parameters

date

Default is Date.today

currency

Currency passed in

Returns

the currency rate



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# File 'lib/momm/calculator.rb', line 118

def get_rate(from, date = Date.today)
  res = get_rate_origin(from, date)
  return res if res != 0 && res

  update!
  get_rate_origin(from, date)
end

#respond_to?(meth, include_private = false) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/momm/calculator.rb', line 140

def respond_to?(meth, include_private = false)
  meth = meth.to_s
  meth.match(/^exchange_rate_from_(\w+)_to_(\w+)/) ||
    meth.match(/^exchange_from_(\w+)_to_(\w+)/) ||
      super
end

#update! ⇒ Object

Update the feeds. In most case, you do not need to call this, because Momm will update the feeds everytime she find something missing ;)

Returns

nil



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# File 'lib/momm/calculator.rb', line 35

def update!
  origin_update(feed.currency_rates)
end