Class: Vorpal::AggregateTraversal

Inherits:
Object
  • Object
show all
Defined in:
lib/vorpal/aggregate_traversal.rb

Instance Method Summary collapse

Constructor Details

#initialize(configs) ⇒ AggregateTraversal

Returns a new instance of AggregateTraversal.



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# File 'lib/vorpal/aggregate_traversal.rb', line 4

def initialize(configs)
  @configs = configs
end

Instance Method Details

#accept(object, visitor, already_visited = []) ⇒ Object

Traversal should always begin with an object that is known to be able to reach all other objects in the aggregate (like the root!)



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# File 'lib/vorpal/aggregate_traversal.rb', line 10

def accept(object, visitor, already_visited=[])
  return if object.nil?

  config = @configs.config_for(object.class)
  return if config.nil?

  return if already_visited.include?(object)
  already_visited << object

  visitor.visit_object(object, config)

  config.belongs_tos.each do |belongs_to_config|
    child = belongs_to_config.get_child(object)
    accept(child, visitor, already_visited) if visitor.continue_traversal?(belongs_to_config)
  end

  config.has_ones.each do |has_one_config|
    child = has_one_config.get_child(object)
    accept(child, visitor, already_visited) if visitor.continue_traversal?(has_one_config)
  end

  config.has_manys.each do |has_many_config|
    children = has_many_config.get_children(object)
    children.each do |child|
      accept(child, visitor, already_visited) if visitor.continue_traversal?(has_many_config)
    end
  end
end