Module: OM::XML::Accessors::ClassMethods

Defined in:
lib/om/xml/accessors.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#accessors ⇒ Object

Returns the value of attribute accessors.



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# File 'lib/om/xml/accessors.rb', line 4

def accessors
  @accessors
end

Instance Method Details

#accessor(accessor_name, opts = {}) ⇒ Object 



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# File 'lib/om/xml/accessors.rb', line 6

def accessor(accessor_name, opts={})
  @accessors ||= {}
  insert_accessor(accessor_name, opts)
end

#accessor_info(*args) ⇒ Object

Returns the configuration info for the selected accessor. Ingores any integers in the array (ie. nodeset indices intended for use in other accessor convenience methods)



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# File 'lib/om/xml/accessors.rb', line 43

def accessor_info(*args)
  # Ignore any nodeset indexes in the args array
  keys = args.select {|x| !x.kind_of?(Integer) }
  info = @accessors
  keys.each do |k|
    unless keys.index(k) == 0
      info = info.fetch(:children, nil)
      if info.nil?
        debugger
        return nil
      end
    end
    
    info = info.fetch(k, nil)
    if info.nil?
      return nil
    end
  end
  return info
end

#accessor_xpath(*args) ⇒ Object 



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# File 'lib/om/xml/accessors.rb', line 65

def accessor_xpath(*args)
  keys = even_values(args)
  indices = odd_values(args)
  xpath = "//"
  keys.each do |k|
    key_index = keys.index(k)
    accessor_info = accessor_info(*keys[0..key_index])
    relative_path = accessor_info[:relative_xpath]
    
    if relative_path.kind_of?(Hash)
      if relative_path.has_key?(:attribute)
        relative_path = "@"+relative_path[:attribute]
      end
    else
    
      if indices[key_index]
        add_position_predicate!(relative_path, indices[key_index])
      end
    
      if accessor_info.has_key?(:default_content_path)
        relative_path << "/"+accessor_info[:default_content_path]
      end
    
    end
    if key_index > 0
      relative_path.insert(0, "/")
    end
    xpath << relative_path 
  end
  
  return xpath
end

#add_position_predicate!(xpath_query, array_index_value) ⇒ Object 



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# File 'lib/om/xml/accessors.rb', line 98

def add_position_predicate!(xpath_query, array_index_value)
  position_function = "position()=#{array_index_value + 1}"
  
  if xpath_query.include?("]")
    xpath_query.insert(xpath_query.rindex("]"), " and #{position_function}")
  else
    xpath_query << "[#{position_function}]"
  end
end

#even_values(array) ⇒ Object 



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# File 'lib/om/xml/accessors.rb', line 111

def even_values(array)
  array.values_at(* array.each_index.select {|i| i.even?})
end

#insert_accessor(accessor_name, accessor_opts, parent_names = []) ⇒ Object 



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# File 'lib/om/xml/accessors.rb', line 11

def insert_accessor(accessor_name, accessor_opts, parent_names=[])
  unless accessor_opts.has_key?(:relative_xpath)
    accessor_opts[:relative_xpath] = "oxns:#{accessor_name}"
  end
  
  destination = @accessors
  parent_names.each do |parent_name|
    destination = destination[parent_name][:children]
  end
  
  destination[accessor_name] = accessor_opts
  
  # Recursively call insert_accessor for any children
  if accessor_opts.has_key?(:children)
    children_array = accessor_opts[:children].dup
    accessor_opts[:children] = {}
    children_array.each do |child| 
      if child.kind_of?(Hash)
        child_name =  child.keys.first
        child_opts =  child.values.first
      else
        child_name = child
        child_opts = {}
      end
      insert_accessor(child_name, child_opts, parent_names+[accessor_name] )           
    end
  end
    
end

#odd_values(array) ⇒ Object 



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# File 'lib/om/xml/accessors.rb', line 108

def odd_values(array)
  array.values_at(* array.each_index.select {|i| i.odd?})
end