Module: XMLMapping

Included in:
Atom::Category, Atom::Content, Atom::Entry, Atom::Feed, Atom::Generator, Atom::Link, Atom::Person, Atom::Source
Defined in:
lib/xmlmapping.rb

Defined Under Namespace

Modules: ClassMethods

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.included(mod) ⇒ Object 



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# File 'lib/xmlmapping.rb', line 27

def self.included(mod)
	mod.extend(ClassMethods)
	mod.instance_variable_set("@attributes", {})
	mod.instance_variable_set("@elements", {})
	mod.instance_variable_set("@text_attribute", nil)
end

Instance Method Details

#initialize(input) ⇒ Object 



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# File 'lib/xmlmapping.rb', line 34

def initialize(input)
	if input.respond_to? :to_str
		root = REXML::Document.new(input).root
	elsif input.respond_to?(:node_type) && input.node_type == :document
		root = input.root
	elsif input.respond_to?(:node_type) && input.node_type == :element
		root = input
	else 
		raise "Invalid input: #{input}"
	end

	namespace = self.class.default_namespace
	attributes = self.class.attributes
	elements = self.class.elements
	text_attribute = self.class.text_attribute

	if !text_attribute.nil?
		name = text_attribute[0]
		options = text_attribute[1]
		value = root.text

		if options.has_key? :transform
			value = options[:transform].call(value)
		end

		instance_variable_set("@#{name}", value)
	else
		# initialize :many attributes
		elements.select { |k, v|
			v[:cardinality] == :many
		}.each { |k, v|
			instance_variable_set("@#{v[:attribute]}", [])
		}

		root.each_element { |e| 
			if e.namespace == namespace && elements.has_key?(e.name.to_sym)
				options = elements[e.name.to_sym]

				if options.has_key? :type
						value = options[:type].new(e)	
				else
						value = e.text
				end

				if options.has_key? :transform
					value = options[:transform].call(value)
				end

				attribute = options[:attribute]

				existing = instance_variable_get("@#{attribute}")
				case options[:cardinality]
					when :one 
						raise "Found more than one #{e.name}" if !existing.nil?
						instance_variable_set("@#{attribute}", value)
					when :many 
						existing << value
				end		
			end
		}
	end

	root.attributes.each_attribute { |a|
		if a.namespace == namespace && attributes.has_key?(a.name.to_sym)
			options = attributes[a.name.to_sym]

			value = a.value
			if options.has_key? :transform
				value = options[:transform].call(value)
			end

			instance_variable_set("@#{a.name}", value)
		end
	}
end