Module: TemplateMethodable::ClassMethods

Defined in:
lib/template_methodable.rb

Instance Method Summary collapse

Instance Method Details

#must_impl(*methods) ⇒ Object

template method force class macro

concrete class must define *methods. if not define ‘*method’, raise NotImplementedError.

sample BaseClass

require "template_methodable"
class BaseDeveloper
  include TemplateMethodable
  must_impl :easy_coding, :difficult_coding, :normal_coding
  module DIFFICILTY
    EASY = 1
    NORMAL = 2
    DIFFICILT = 3
  end
  def coding(difficulty)
    ret = []
    ret << "start coding"
    case difficulty
    when DIFFICILTY::EASY
      ret << easy_coding("hoge", "hige")
    when DIFFICILTY::NORMAL
      ret << normal_coding("hoge", "hige")
    when DIFFICILTY::DIFFICILT
      ret << difficult_coding("hoge", "hige")
    else
      fail 'error'
    end
    ret << "finish coding"
    ret.join("\n")
  end
end

sample Concrete Class. if you don’t define xxxx_coding method, it raises NotImplementedError.

class StarDeveloper < BaseDeveloper
  def easy_coding(hoge, hige)
    "complete 1 minutes"
  end
  def normal_coding(hoge, hige)
    "complete 10 minutes"
  end
  def difficult_coding(hoge, hige)
    "complete 59 minutes"
  end
end



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# File 'lib/template_methodable.rb', line 54

def must_impl(*methods)
  return if methods.nil?
  fail TypeError, "invalid args type #{methods.class}. you must use Array or Symbol" unless methods.class.any_of? Array, Symbol
  methods = (methods.class.is_a? Symbol) ? [methods] : methods
  methods.each do |method_name|
    fail TypeError, "invalid args type #{method_name.class}. you must use Symbol" unless method_name.is_a? Symbol
    define_method method_name do |*args|
      fail NotImplementedError.new
    end
  end
end