eventespresso / event-espresso-core

		if ( empty( $addon_name ) || ! is_array( $setup_args )) {

			throw new EE_Error( __( 'In order to register an EE_Addon with EE_Register_Addon::register(), you must include the "addon_name" (the name of the addon), and an array of arguments.', 'event_espresso' ));

		}

		if ( ! isset($setup_args[ 'main_file_path' ]) || empty( $setup_args[ 'main_file_path' ] ) ){

			throw new EE_Error( sprintf( __( 'When registering an addon, you didn\'t provide the "main_file_path", which is the full path to the main file loaded directly by Wordpress. You only provided %s', 'event_espresso' ), implode(",", array_keys( $setup_args ) ) ) );

		}

		// check that addon has not already been registered with that name

		if ( isset( self::$_settings[ $addon_name ] ) && ! did_action( 'activate_plugin' ) ) {

			throw new EE_Error( sprintf( __( 'An EE_Addon with the name "%s" has already been registered and each EE_Addon requires a unique name.', 'event_espresso' ), $addon_name ));

					//then $possible_array_of_params looks something like array('<','DTT_sold',true)

					//indicating that $possible_array_of_params[1] is actually a field name,

					//from which we should extract query parameters!

					if( ! isset($possibly_array_of_params[0], $possibly_array_of_params[1] ) ) {

						throw new EE_Error(sprintf(__("Improperly formed query parameter %s. It should be numerically indexed like array('<','DTT_sold',true); but you provided %s", "event_espresso"),$query_param_type,implode(",",$possibly_array_of_params)));

					}

					$this->_extract_related_model_info_from_query_param($possibly_array_of_params[1], $model_query_info_carrier, $query_param_type);

				}

			}