# Decorator 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 getColumns
  end
  def getRows
  end
  def getRowText(row)
  end
  def show
    (1..getRows).each {|i| puts self.getRowText(i-1) }
  end
end

class StringDisplay < Display
  def initialize(string)
    @string = string
  end
  def getColumns
    @string.length
  end
  def getRows
    1
  end
  def getRowText(row)
    if row == 0 
      @string
    else
      ""
    end
  end
end

class Border < Display
  def initialize(display)
    @display = display
  end
end

class SideBorder < Border
  def initialize(display, ch)
    @display = display
    super(@display)
    @borderChar = ch
  end
  def getColumns
    1 + @display.getColumns + 1
  end
  def getRows
    @display.getRows
  end
  def getRowText(row)
    @borderChar + @display.getRowText(row) + @borderChar
  end
end

class FullBorder < Border
  def initialize(display)
    @display = display
    super(@display)
  end
  def getColumns
    1 + @display.getColumns + 1
  end
  def getRows
    1 + @display.getRows + 1
  end
  def getRowText(row)
    if (row==0) 
      "+" + makeLine("-", @display.getColumns) + "+"   
    elsif (row == @display.getRows + 1) 
      "+" + makeLine("-", @display.getColumns) + "+" 
    else
      "|" + @display.getRowText(row - 1) + "|"
    end
  end
  def makeLine(ch, count)
    @buffer =""
    count.times do @buffer += ch end
    @buffer
  end
end

b1 = StringDisplay.new("Hello, World")
b2 = SideBorder.new(b1, "#")
b3 = FullBorder.new(b2)

b1.show
b2.show
b3.show

b4 = SideBorder.new(
       FullBorder.new(
         FullBorder.new(
           SideBorder.new(
             FullBorder.new(
               StringDisplay.new("こんにちは。")
             ), "*"
           )
         )
       ), "/"
     )
b4.show