# File activesupport/lib/active_support/callbacks.rb, line 213
def self.build(callback_sequence, user_callback, user_conditions, chain_config)
  if chain_config[:skip_after_callbacks_if_terminated]
    if user_conditions.any?
      halting_and_conditional(callback_sequence, user_callback, user_conditions)
    else
      halting(callback_sequence, user_callback)
    end
  else
    if user_conditions.any?
      conditional callback_sequence, user_callback, user_conditions
    else
      simple callback_sequence, user_callback
    end
  end
end