Decorators

decorators_poro.rb

class Poet
  def produce_art(inspiration)
    "#{inspiration} !"
  end
end

class ArtistDecorator < Struct.new(:artist)
  def produce_art(inspiration)
    artist.produce_art(inspiration)
  end
end

class Musician < ArtistDecorator
  def produce_art(inspiration)
    @art = artist.produce_art(inspiration)
    add_music_to_art
  end

  private
    def add_music_to_art
      "MUSIC! #{@art}"
    end
end

class VideoDirector < ArtistDecorator
  def produce_art(inspiration)
    @art = artist.produce_art(inspiration)
    add_video_to_art
  end

  private
    def add_video_to_art
      "ACTION! #{@art}"
    end
end

artist = VideoDirector.new(Musician.new(Poet.new))
p artist.produce_art("Every rose has its thorn...")

# "ACTION! MUSIC! Every rose has its thorn..."