Class: LightCurrencyConverter::CurrencyCollection

Inherits:
Object
  • Object
show all
Includes:
Enumerable
Defined in:
lib/light_currency_convert/currency_collection.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(json_string) ⇒ CurrencyCollection

Returns a new instance of CurrencyCollection.



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# File 'lib/light_currency_convert/currency_collection.rb', line 8

def initialize(json_string)
  json_entries = JSON.parse(json_string)
  @currencies = json_entries.to_a.map { |e| CurrencyCourse.new(*e) }
  @graph = Graph.new
  populate_graph
end

Instance Attribute Details

#currencies ⇒ Object

Returns the value of attribute currencies.



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# File 'lib/light_currency_convert/currency_collection.rb', line 6

def currencies
  @currencies
end

#graph ⇒ Object

Returns the value of attribute graph.



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# File 'lib/light_currency_convert/currency_collection.rb', line 6

def graph
  @graph
end

Instance Method Details

#[](*args) ⇒ Object 



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# File 'lib/light_currency_convert/currency_collection.rb', line 19

def [](*args)
  @currencies[*args]
end

#base_find(currency_one, currency_two) ⇒ Object 



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# File 'lib/light_currency_convert/currency_collection.rb', line 27

def base_find(currency_one, currency_two)
  detect { |e| e.from.currency == currency_one && e.to.currency == currency_two }
end

#each ⇒ Object 



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# File 'lib/light_currency_convert/currency_collection.rb', line 15

def each
  @currencies.each { |e| yield(e) }
end

#find_currency_course(from, to) ⇒ Object 



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# File 'lib/light_currency_convert/currency_collection.rb', line 23

def find_currency_course(from, to)
  simple_find(from, to) || graph_find(from, to)
end

#graph_find(from, to) ⇒ Object 



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# File 'lib/light_currency_convert/currency_collection.rb', line 35

def graph_find(from, to)
  graph.search_path(from, to, [], results = [])
  return nil if results.empty?

  result = graph.minimize_result(results)
  full_path = [result[0], *(result[1..-2].map{|x| [x, x] }.flatten), result[-1]].each_slice(2)
  courses = full_path.map { |x| simple_find(*x) }
  IndirectCurrencyCourse.new(courses, full_path)
end

#simple_find(from, to) ⇒ Object 



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# File 'lib/light_currency_convert/currency_collection.rb', line 31

def simple_find(from, to)
  base_find(from, to) || base_find(to, from)
end