gistfile1.txt

# Bridge パターン
#
# Java言語で学ぶデザインパターンと同様の例題をRubyで記述した。
#
# coded by Takehiro Kaga
#

class Display
  def initialize(impl)
    @impl = impl
  end
  def open
    @impl.rawOpen
  end
  def printf
    @impl.rawPrint
  end
  def close
    @impl.rawClose
  end
  def display
    open
    printf
    close
  end
end

class CountDisplay < Display
  def initialize(impl)
    super(impl)
  end
  def multiDisplay(times)
    open
    for i in 1..times
      printf
    end
    close
  end
end


class DisplayImpl
  def rawOpen
  end
  def rawPrint
  end
  def rawClose
  end
end


class StringDisplayImpl < DisplayImpl
  def initialize(string)
    @string = string
    @width = @string.length
  end
  def rawOpen
    printLine
  end
  def rawPrint
    puts("|" + @string + "|")
  end
  def rawClose
    printLine
  end
  def printLine
    print "+"
    for i in 1..@width
      print "-"
    end
    puts "+"
  end
end


# --- Main --- #

d1 = Display.new(StringDisplayImpl.new("Hello, Japan."))
d2 = CountDisplay.new(StringDisplayImpl.new("Hello, World."))
d3 = CountDisplay.new(StringDisplayImpl.new("Hello, Universe."))
d1.display
d2.display
d3.display
d3.multiDisplay(5)