ama-team / ruby-entity-mapper

          class Enumerator < API::Enumerator

            include Mixin::Errors

            # @param [AMA::Entity::Mapper::API::Enumerator] processor

            def initialize(processor)

              @processor = processor

              @fallback = Default::Enumerator::INSTANCE

            end

            # @param [Object] entity

            # @param [AMA::Entity::Mapper::Type] type

            # @param [AMA::Entity::Mapper::Context] context

            def enumerate(entity, type, context = nil)

              context ||= Context.new

              @processor.enumerate(entity, type, context) do |e, t, c|

                @fallback.enumerate(e, t, c)

              end

            rescue StandardError => e

              raise_if_internal(e)

              message = "Error while enumerating #{entity.class} " \

                "(type: #{type}) attributes using #{@processor}"

              if e.is_a?(ArgumentError)

                message += "Does #{@processor}#enumerate have signature " \

                  '(entity, type, context = nil)?'

              end

              mapping_error(message, parent: e, context: context)

            end

          end