日々の破片

_ どこまでバラすか

入力値AにルールBを適用しCを作成しDに保存する。

#1.バラさない
class Hole
  def do_all(a)
    # b
    if (a == 0)
      c = a + 1
    elsif (a == 10)
      c = a * 2
    elsif (a == 20)
      c = a * 3
    else
      c = a
    end
    d = Persistence.new()
    d.write(c)
    d.close
  end
end

 
#2.bをバラす
class WithoutB
  def do_all(a)
    b = B.new(a)
    d = Persistence.new()
    d.write(b.c)
    d.close
  end
end
 
class B
  def initialize(a)
    if (a == 0)
      @c = a + 1
    elsif (a == 10)
      @c = a * 2
    elsif (a == 20)
      @c = a * 3
    else
      @c = a
    end
  end
  attr_reader :c
end

#3.BとDの統合
class WithoutBandD
  def do_all(a)
    B.new(a).save
  end
end
 
class B
  def initialize(a)
    if (a == 0)
      @c = a + 1
    elsif (a == 10)
      @c = a * 2
    elsif (a == 20)
      @c = a * 3
    else
      @c = a
    end
  end
  def save()
    d = Persistence.new()
    d.write(@c)
    d.close
  end
end

#4.2と同じだがDから具象性を奪う
class WithoutB
  def do_all(a)
    b = B.new(a)
    D.instance().save(b.c)
  end
end
 
class B
  def initialize(a)
    if (a == 0)
      @c = a + 1
    elsif (a == 10)
      @c = a * 2
    elsif (a == 20)
      @c = a * 3
    else
      @c = a
    end
  end
  attr_reader :c
end
 
class D
  def self.instance()
    D.new()
  end
 
  def save(c)
    d = get_writer()
    d.write(c)
    d.close
  end
 
 protected
  def get_writer()
    Persistence.new
  end
end

#5.2と同じだがBを細分化する
class WithoutB
  def do_all(a)
    b = B.create(a)
    d = Persistence.new()
    d.write(b.c)
    d.close
  end
end
 
class B
  def self.create(a)
    if (a == 0)
      b = B0.new(a)
    elsif (a == 10)
      b = B1.new(a)
    elsif (a == 20)
      b = B2.new(a)
    else
      b = B.new(a)
    end
    b
  end
  
  def initialize(a)
    @c = a
  end
 
  attr_reader :c
end
 
class B0 < B
  def initialize(a)
    @c = a + 1
  end
end
 
class B1 < B
  def initialize(a)
    @c = a * 2
  end
end
 
class B2 < B
  def initialize(a)
    @c = a * 3
  end
end