Work in progress to convert pure java xml to java flavored nokogiri

read_write_xml_processing.rb

#
# Loading XML Data
# by Daniel Shiffman.
#
# This example demonstrates how to use loadXML
# to retrieve data from an XML file and make objects
# from that data.
#
# Here is what the XML looks like:
#
# <?xml version='1.0'?>
# <bubbles>
#  <bubble>
#    <position x='160' y='103'/>
#    <diameter>43.19838</diameter>
#    <label>Happy</label>
#  </bubble>
#  <bubble>
#    <position x='372' y='137'/>
#    <diameter>52.42526</diameter>
#    <label>Sad</label>
#  </bubble>
# </bubbles>
#
load_library 'bubble'

attr_reader :bubbles, :xml

def setup
  sketch_title 'Load save xml'
  load_data
end

def draw
  background(255)
  # Display all bubbles
  bubbles.each do |b|
    b.display
    b.rollover(mouse_x, mouse_y)
  end
  text_align(LEFT)
  fill(0)
  text('Click to add bubbles.', 10, height - 10)
end

def load_data
  # Load XML file
  @xml = loadXML(data_path('data.xml'))
  # Get all the child nodes named 'bubble'
  children = xml.get_children('bubble')
  sketch_title 'Load & Save Xml'
  # total XML elements named 'bubble'
  @bubbles = []
  children.each do |element|
    # The position element has two attributes: x and y
    position_element = element.get_child('position')
    # Note how with attributes we can get an integer or directly
    x, y = position_element.get_int('x'), position_element.get_int('y')
    # The diameter is the content of the child named 'diamater'
    diameter_element = element.get_child('diameter')
    # Note how with the content of an XML node, we retrieve as a
    # String and then convert
    diameter = (diameter_element.get_content).to_f
    # The label is the content of the child named 'label'
    label_element = element.get_child('label')
    label = label_element.get_content
    # Make a Bubble object out of the data read
    bubbles << Bubble.new(x, y, diameter, label)
  end
end

# Still need to work on adding and deleting
def mouse_pressed
  # Create a new XML bubble element
  bubble = xml.add_child('bubble')
  # Set the poisition element
  position = bubble.add_child('position')
  # Here we can set attributes as integers directly
  position.set_int('x', mouseX)
  position.set_int('y', mouseY)
  # Set the diameter element
  diameter = bubble.add_child('diameter')
  # Here for a node's content, we have to convert to a String
  diameter.set_content(rand(40.0..80).to_s)
  # Set a label
  label = bubble.add_child('label')
  label.set_content('New label')
  # Here we are removing the oldest bubble if there are more than 10
  children = xml.get_children('bubble')
  # If the XML file has more than 10 bubble elements
  xml.remove_child(children[0]) if children.length > 10
  # Save a new XML file
  saveXML(xml, data_path('data.xml'))
  # reload the new data
  load_data
end

def settings
  size(640, 360)
end

write_xml_nokogiri.rb

require 'nokogiri'

builder = Nokogiri::XML::Builder.new(:encoding => 'UTF-8') do |xml|
  xml.bubbles {
    xml.bubble {
      xml.position {
        xml.name_ "x"
        xml.value "10"
        xml.name_ "y"
        xml.value "20"
      }
    xml.diameter "100"
    xml.label "pig"
    }
    xml.bubble {
      xml.position {
        xml.name_ "x"
        xml.value "18"
        xml.name_ "y"
        xml.value "29"
      }
    xml.diameter "70"
    xml.label "chicken"
    }
  }
end
puts builder.to_xml