Class: AcDc::Body

Inherits:
Object
  • Object
show all
Defined in:
lib/acdc/body.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(values = {}) ⇒ Body

Populates the attributes and elements declared for this object. class ThunderStruck < Body

attribute :thunder
element :lightning

end kaboom = ThunderStruck.new(=> {:thunder => “boom”, :lightning => “crash”})

Examples:

Filling the values and attributes

Options Hash (values):

  • :attributes (Hash) —

    Hash list of attributes to populate



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# File 'lib/acdc/body.rb', line 14

def initialize(values = {})
  @attributes ||= {}
  @elements ||= {}
  # catch default values for attributes
  unless self.class.declared_attributes.values.all?{|val| val.nil?}
    self.class.declared_attributes.each do |key,val|
      attributes.update(key => Attribute(key,val)) unless val.nil?
    end
  end
  # now set initialized attribute values
  if values.has_key?(:attributes)
    values.delete(:attributes).each do |key,val|
      if self.class.declared_attributes.has_key?(key)
        attributes.update(key => Attribute(key,val)) 
      end
    end
  end
  # and finally set values
  values.each do |key,val|
    if self.class.declared_elements.has_key?(key)
      type = options_for(key)[:type]
      if type
        if val.respond_to?(:each)
          val.each {|v| raise ArgumentError.new("Type is invalid") unless v.is_a?(type)}
        else
          raise ArgumentError.new("Type is invalid") unless val.is_a?(type)
        end
        elements.update(key => type.new(val,options_for(key),key))
      else
        elements.update(key => Element(val,options_for(key),key))
      end
    end
  end
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method_id, *args, &block) ⇒ Object 



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# File 'lib/acdc/body.rb', line 66

def method_missing(method_id, *args, &block)
  key = method_id.to_s.gsub(/\=/,"").to_sym
  if elements.has_key?(key) or attributes.has_key?(key)
    (method_id.to_s.match(/\=$/)) ? write(method_id, *args, &block) : read(method_id)
  else
    super
  end
end

Instance Attribute Details

#attributes ⇒ Object

Returns the value of attribute attributes.



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# File 'lib/acdc/body.rb', line 4

def attributes
  @attributes
end

#elements ⇒ Object

Returns the value of attribute elements.



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# File 'lib/acdc/body.rb', line 4

def elements
  @elements
end

Class Method Details

.acdc(xml) ⇒ Object

Converts the XML to a Class object found in the library



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# File 'lib/acdc/body.rb', line 110

def acdc(xml)
  doc = Hpricot.XML(xml)
  klass = doc.root.name.constantize
  attributes = doc.root.attributes.inject({}){|acc,attr| acc.update(attr[0].to_sym => attr[1])}
  values = doc.root.children.inject({}) do |acc, node|
    name = node.name.underscore.to_sym
    value = value_from_node(node)
    attrs = node.attributes
    acc.merge!({name => value, :attributes => attrs})
  end
  klass.new(values.merge(:attributes => attributes))
end

.attribute(name, value = nil) ⇒ Object

Declare an attribute for this Body



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# File 'lib/acdc/body.rb', line 93

def attribute(name, value = nil)
  declared_attributes.update(name => value)
end

.declared_attributes ⇒ Object

Returns a Hash list of Attributes declared



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# File 'lib/acdc/body.rb', line 104

def declared_attributes 
  @attributes ||= {}
  @declared_attributes ||= @attributes[to_s] ||= {}
end

.declared_elements ⇒ Object

Returns the Hash list of Elements declared



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# File 'lib/acdc/body.rb', line 98

def declared_elements 
  @elements ||= {}
  @declared_elements ||= @elements[to_s] ||= {}
end

.element(*options) ⇒ Object

Declare an Element for this Body

Options Hash (*options):

  • :single (Boolean) —

    False if object is a collection



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# File 'lib/acdc/body.rb', line 85

def element(*options)
  name = options.first
  type = options.second || nil
  opts = options.extract_options!
  declared_elements.update(name => opts.merge(:type => type))
end

.inherited(child) ⇒ Object 



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# File 'lib/acdc/body.rb', line 76

def inherited(child)
  child.instance_variable_set('@declared_elements', @declared_elements)
  child.instance_variable_set('@declared_attributes', @declared_attributes)
end

Instance Method Details

#acdc ⇒ Object

Converts object to XML



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# File 'lib/acdc/body.rb', line 50

def acdc
  xml = Builder::XmlMarkup.new
  attrs = attributes.inject({}){|acc,attr| acc.update(attr[1].to_hash)}
  xml.tag!(tag_name,attrs){ |body|
    elements.each do |key, elem|
      body << elem.acdc
    end
  }
  xml.target!
end

#tag_name ⇒ Object

The name to use for the tag



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# File 'lib/acdc/body.rb', line 62

def tag_name
  self.class.to_s.split("::").last
end