Module: CountryCodes::Internal::Helpers

Included in:
Country, LookupTable
Defined in:
lib/country_codes/internal/helpers.rb

Overview

Note:

This code is not supposed to be used externally!

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.included(obj) ⇒ Object

rubocop:disable Metrics/CyclomaticComplexity



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# File 'lib/country_codes/internal/helpers.rb', line 15

def self.included(obj)
  obj.class_eval do
    # Defines a method(s) that redirect calls to an underlying object (receiver).
    # Allows passing a list of interceptors that will be applied sequentially
    # with the result of redirected call as the first (and only) argument.
    # An interceptor can be either a Proc (the proc itself will be `#call`-ed),
    # or a Symbol as a name of an instance method to be used.
    #
    # @param [Array<Symbol>] methods Name of methods to be defined
    # @param [Object] to Name of an instance method used to retrieve the receiver
    # @param [Array<Proc, Symbol>] interceptors A list of interceptors.
    def self.delegate(*methods, to:, interceptors: [])
      unless methods.reject { |m| m.is_a? Symbol }.empty?
        raise ArgumentError, 'expected method reference to be a Symbol!'
      end

      interceptors = [interceptors] unless interceptors.is_a?(Array)

      methods.each do |method|
        define_method(method) do |*args|
          result = send(to).send(method, *args)

          interceptors.reduce(result) do |memo, interceptor|
            case interceptor
            when Proc
              interceptor.call(memo)
            when Symbol
              send(interceptor, memo)
            else
              memo
            end
          end
        end
      end
    end
  end
end

Instance Method Details

#pack_seq(enumerable) ⇒ JavaLangObject

Converts a given enumerable to a ‘scala.collection.Seq` Java object

Parameters:

  • enumerable (Enumerable) —

    An enumerable to wrap

Returns:

  • (JavaLangObject) —

    A wrapped Seq object



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# File 'lib/country_codes/internal/helpers.rb', line 78

def pack_seq(enumerable)
  list_iter = ArrayList.new(enumerable.to_a).iterator

  JavaConverters.as_scala_iterator_converter(list_iter).as_scala.to_seq
end

#unpack_seq(seq) ⇒ JavaLangObject

Converts a ‘scala.collection.Seq` Java object to a Ruby array

Parameters:

  • seq (JavaLangObject) —

    An object to convert

Returns:

  • (JavaLangObject) —

    Extracted array



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# File 'lib/country_codes/internal/helpers.rb', line 70

def unpack_seq(seq)
  JavaConverters.seq_as_java_list(seq).to_a
end

#unpack_some(some) ⇒ Object

Unpacks a scala.Some Java object to a value or ‘nil` (if an object is empty).

Parameters:

  • some (JavaLangObject) —

    A ‘scala.Some` object to unpack

Returns:

  • (Object) —

    A value contained in the object, or nil, if the object is empty



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# File 'lib/country_codes/internal/helpers.rb', line 58

def unpack_some(some)
  if some.empty?
    nil
  else
    some.get
  end
end