Revisiting yaml load and save for jruby-2.0

In the previous post I inclube the "bubble" library which I re-use here in my re-factored load_and_save_yaml.rb sketch (JRubyArt the development branch of ruby-processing). Hereis the yaml:-

---
bubbles:
- :x: 160
  :y: 103
  :diameter: 43.19838
  :label: Happy
- :x: 372
  :y: 137
  :diameter: 52.42526
  :label: Sad
- :x: 273
  :y: 235
  :diameter: 61.14072
  :label: Joyous
- :x: 121
  :y: 179
  :diameter: 44.758068
  :label: Melancholy

Here is the JRubyArt sketch:-

######################################
# Yet another examples of reading and
# writing to some form of markup,
# appropriately yaml.
# by Martin Prout after Dan Shiffman
# updated for ruby-2.0 (Struct to Hash)
# ###################################
load_library :bubble

attr_reader :bubble_data

def setup()
  size(640, 360)
  # load data from file
  @bubble_data = BubbleData.new "bubbles"
  bubble_data.load_data "data/data.yml"
end

def draw
  background 255
  bubble_data.display mouse_x, mouse_y
end

def mouse_pressed
  # create a new bubble instance, where mouse was clicked
  @bubble_data.create_new_bubble(mouse_x, mouse_y)
end

class BubbleData
  include Enumerable

  MAX_BUBBLE = 10

  attr_reader :key, :path, :bubbles
  def initialize key
    @key = key
    @bubbles = []
  end

  def each &block
    bubbles.each &block
  end

  def create_new_bubble x, y
    self << Bubble.new(x, y, rand(40 .. 80), "new label")
    save_data
    load_data path
  end

  def display x, y
    self.each do |bubble|
      bubble.display
      bubble.rollover(x, y)
    end
  end

  # @param path to yaml file

  def load_data path
    @path = path
    yaml = Psych.load_file("data/data.yml")
    data = yaml[key]
    bubbles.clear
    # iterate the bubble_data array, and create an array of bubbles
    data.each do |point|
      self << Bubble.new(
        point[:x],
        point[:y],
        point[:diameter],
        point[:label])
    end
  end


  def << bubble
    bubbles << bubble
    bubbles.shift if bubbles.size > MAX_BUBBLE
  end

  private

  def save_data
    hash = { key => self.map{ |point| point.to_h} }
    yaml = hash.to_yaml
    # overwite existing 'data.yaml' 
    open("data/data.yml", 'w:UTF-8') {|f| f.write(yaml) }
  end

end