Module: HappyMapper::ClassMethods

Defined in:
lib/happymapper.rb

Instance Method Summary collapse

Instance Method Details

#attribute(name, type, options = {}) ⇒ Object 



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# File 'lib/happymapper.rb', line 22

def attribute(name, type, options={})
  attribute = Attribute.new(name, type, options)
  @attributes[to_s] ||= []
  @attributes[to_s] << attribute
  attr_accessor attribute.method_name.intern
end

#attributes ⇒ Object 



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# File 'lib/happymapper.rb', line 29

def attributes
  @attributes[to_s] || []
end

#element(name, type, options = {}) ⇒ Object 



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# File 'lib/happymapper.rb', line 33

def element(name, type, options={})
  element = Element.new(name, type, options)
  @elements[to_s] ||= []
  @elements[to_s] << element
  attr_accessor element.method_name.intern
end

#elements ⇒ Object 



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# File 'lib/happymapper.rb', line 40

def elements
  @elements[to_s] || []
end

#has_many(name, type, options = {}) ⇒ Object 



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# File 'lib/happymapper.rb', line 53

def has_many(name, type, options={})
  element name, type, {:single => false}.merge(options)
end

#has_one(name, type, options = {}) ⇒ Object 



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# File 'lib/happymapper.rb', line 49

def has_one(name, type, options={})
  element name, type, {:single => true}.merge(options)
end

#namespace(namespace = nil) ⇒ Object

Specify a namespace if a node and all its children are all namespaced elements. This is simpler than passing the :namespace option to each defined element.



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# File 'lib/happymapper.rb', line 60

def namespace(namespace = nil)
  @namespace = namespace if namespace
  @namespace
end

#parse(xml, options = {}) ⇒ Object 



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# File 'lib/happymapper.rb', line 73

def parse(xml, options = {})
  # locally scoped copy of namespace for this parse run
  namespace = @namespace

  if xml.is_a?(XML::Node)
    node = xml
  else
    if xml.is_a?(XML::Document)
      node = xml.root
    else
      node = XML::Parser.string(xml).parse.root
    end

    root = node.name == tag_name
  end

  # This is the entry point into the parsing pipeline, so the default
  # namespace prefix registered here will propagate down
  namespaces = node.namespaces
  if namespaces && namespaces.default
    # don't assign the default_prefix if it has already been assigned
    namespaces.default_prefix = DEFAULT_NS unless namespaces.find_by_prefix(DEFAULT_NS)
    namespace ||= DEFAULT_NS
  end

  xpath = root ? '/' : './/'
  xpath += "#{namespace}:" if namespace
  #puts "parse: #{xpath}"

  nodes = []
  # when finding nodes, do it in this order:
  # 1. specified tag
  # 2. name of element
  # 3. tag_name (derived from class name by default)
  [options[:tag], options[:name], tag_name].compact.each do |xpath_ext|
    nodes = node.find(xpath + xpath_ext.to_s)
    break if nodes && nodes.size > 0
  end
  collection = nodes.collect do |n|
    obj = new

    attributes.each do |attr|
      obj.send("#{attr.method_name}=",
                attr.from_xml_node(n, namespace))
    end

    elements.each do |elem|
      obj.send("#{elem.method_name}=",
                elem.from_xml_node(n, namespace))
    end

    obj.send("#{@text_node.method_name}=", 
              @text_node.from_xml_node(n, namespace)) if @text_node
    
    obj
  end

  # per http://libxml.rubyforge.org/rdoc/classes/LibXML/XML/Document.html#M000354
  nodes = nil

  if options[:single] || root
    collection.first
  else
    collection
  end
end

#tag(new_tag_name) ⇒ Object 



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# File 'lib/happymapper.rb', line 65

def tag(new_tag_name)
  @tag_name = new_tag_name.to_s unless new_tag_name.nil? || new_tag_name.to_s.empty?
end

#tag_name ⇒ Object 



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# File 'lib/happymapper.rb', line 69

def tag_name
  @tag_name ||= to_s.split('::')[-1].downcase
end

#text_node(name, type, options = {}) ⇒ Object 



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# File 'lib/happymapper.rb', line 44

def text_node(name, type, options={})
  @text_node = TextNode.new(name, type, options)
  attr_accessor @text_node.method_name.intern
end