public function __construct( $object_type ) {
		$this->object_type = $object_type;
		$this->stores      = apply_filters( 'woocommerce_data_stores', $this->stores );

		// If this object type can't be found, check to see if we can load one
		// level up (so if product-type isn't found, we try product).
		if ( ! array_key_exists( $object_type, $this->stores ) ) {
			$pieces      = explode( '-', $object_type );
			$object_type = $pieces[0];
		}

		if ( array_key_exists( $object_type, $this->stores ) ) {
			$store = apply_filters( 'woocommerce_' . $object_type . '_data_store', $this->stores[ $object_type ] );
			if ( is_object( $store ) ) {
				if ( ! $store instanceof WC_Object_Data_Store_Interface ) {
					throw new Exception( __( 'Invalid data store.', 'woocommerce' ) );
				}
				$this->current_class_name = get_class( $store );
				$this->instance           = $store;
			} else {
				if ( ! class_exists( $store ) ) {
					throw new Exception( __( 'Invalid data store.', 'woocommerce' ) );
				}
				$this->current_class_name = $store;
				$this->instance           = new $store();
			}
		} else {
			throw new Exception( __( 'Invalid data store.', 'woocommerce' ) );
		}
	}