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 21

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 28

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

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



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# File 'lib/happymapper.rb', line 32

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 39

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

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



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# File 'lib/happymapper.rb', line 47

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 43

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 54

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

#parse(xml, options = {}) ⇒ Object 



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# File 'lib/happymapper.rb', line 67

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

  if xml.is_a?(REXML::Node)
    node = xml
  else
    if xml.is_a?(REXML::Document)
      node = xml.root
    else
      node = REXML::Document.new(xml).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
    already_assigned = namespaces.definitions.detect do |defn|
      namespaces.default && namespaces.default.href == defn.href && defn.prefix
    end
    namespaces.default_prefix = DEFAULT_NS unless already_assigned
    namespace ||= DEFAULT_NS
  end

  xpath = root ? '/' : './/'
  xpath += "#{namespace}:" if namespace
  xpath += tag_name
  
  nodes = REXML::XPath.match(node, xpath)
  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
  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 59

def tag(new_tag_name)
  @tag_name = new_tag_name.to_s
end

#tag_name ⇒ Object 



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# File 'lib/happymapper.rb', line 63

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