Class: NBP::ExchangeRate

Inherits:
Object
  • Object
show all
Extended by:
Commons
Defined in:
lib/nbp/exchange_rate.rb

Constant Summary

Constants included from Commons

Commons::CORE_WEB_PATH

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Commons

extended, nbp_date_format_hash

Constructor Details

#initialize(base_file_name = nil, constant_element = 'z', file_extension = '.xml', **fields) ⇒ ExchangeRate

Returns a new instance of ExchangeRate.



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# File 'lib/nbp/exchange_rate.rb', line 46

def initialize(base_file_name = nil, constant_element = 'z', file_extension = '.xml', **fields)
  if base_file_name
    @nbp_file_name = base_file_name + file_extension
  else
    @nbp_file_name = fields[:table_name] + fields[:table_number] + constant_element +
                     fields[:year] + fields[:month] + fields[:day] + file_extension
  end
rescue NoMethodError
  raise ExchangeError, 'One or more fields are missing. Unable to build the object.'
end

Instance Attribute Details

#data ⇒ Object (readonly)

Returns the value of attribute data.



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# File 'lib/nbp/exchange_rate.rb', line 10

def data
  @data
end

#nbp_file_name ⇒ Object

you can pass nbp_file_name directly



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# File 'lib/nbp/exchange_rate.rb', line 9

def nbp_file_name
  @nbp_file_name
end

Class Method Details

.all_exchange_rates(date) ⇒ Object 



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# File 'lib/nbp/exchange_rate.rb', line 26

def all_exchange_rates(date)
  file_names = files_names_on_date(date)
  mutex = Mutex.new
  threads = []
  data = file_names.each_with_object([]) do |file_name, arr|
    threads << Thread.new do
      mutex.synchronize { arr << new(file_name).fetch['tabela_kursow']['pozycja'] }
    end
  end
  threads.map(&:join)
  data.flatten
end

.by_file(file_name) ⇒ Object 



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# File 'lib/nbp/exchange_rate.rb', line 22

def by_file(file_name)
  new(file_name)
end

.on_date(date, table_name:, table_number:) ⇒ Object 



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# File 'lib/nbp/exchange_rate.rb', line 18

def on_date(date, table_name:, table_number:)
  new({ table_name: table_name, table_number: table_number }.merge nbp_date_format_hash(date))
end

Instance Method Details

#fetch ⇒ Object 



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# File 'lib/nbp/exchange_rate.rb', line 57

def fetch
  full_file_path = Commons::CORE_WEB_PATH + nbp_file_name
  @data = ::Nori.new(parser: :rexml).parse open(full_file_path).read
  fail ExchangeError, 'Missing field tabela_kursow in fetched data' unless @data.key?('tabela_kursow')
  return @data
rescue OpenURI::HTTPError
  raise ExchangeError, 'Problem with connection or requested information not found.'
end