itemap-stylesheet' ) );
		$paged           = absint( get_query_var( 'paged' ) );

		// Bail early if this isn't a sitemap or stylesheet route.
		if ( ! ( $sitemap || $stylesheet_type ) ) {
			return;
		}

		if ( ! $this->sitemaps_enabled() ) {
			$wp_query->set_404();
			status_header( 404 );
			return;
		}

		// Render stylesheet if this is stylesheet route.
		if ( $stylesheet_type ) {
			$stylesheet = new WP_Sitemaps_Stylesheet();

			$stylesheet->render_stylesheet( $stylesheet_type );
			exit;
		}

		// Render the index.
		if ( 'index' === $sitemap ) {
			$sitemap_list = $this->index->get_sitemap_list();

			$this->renderer->render_index( $sitemap_list );
			exit;
		}

		$provider = $this->registry->get_provider( $sitemap );

		if ( ! $provider ) {
			return;
		}

		if ( empty( $paged ) ) {
			$paged = 1;
		}

		$url_list = $provider->get_url_list( $paged, $object_subtype );

		// Force a 404 and bail early if no URLs are present.
		if ( empty( $url_list ) ) {
			$wp_query->set_404();
			status_header( 404 );
			return;
		}

		$this->renderer->render_sitemap( $url_list );
		exit;
	}

	/**
	 * Redirects a URL to the wp-sitemap.xml
	 *
	 * @since 5.5.0
	 *
	 * @param bool     $bypass Pass-through of the pre_handle_404 filter value.
	 * @param WP_Query $query  The WP_Query object.
	 * @return bool Bypass value.
	 */
	public function redirect_sitemapxml( $bypass, $query ) {
		// If a plugin has already utilized the pre_handle_404 function, return without action to avoid conflicts.
		if ( $bypass ) {
			return $bypass;
		}

		// 'pagename' is for most permalink types, name is for when the %postname% is used as a top-level field.
		if ( 'sitemap-xml' === $query->get( 'pagename' )
			|| 'sitemap-xml' === $query->get( 'name' )
		) {
			wp_safe_redirect( $this->index->get_index_url() );
			exit();
		}

		return $bypass;
	}

	/**
	 * Adds the sitemap index to robots.txt.
	 *
	 * @since 5.5.0
	 *
	 * @param string $output    robots.txt output.
	 * @param bool   $is_public Whether the site is public.
	 * @return string The robots.txt output.
	 */
	public function add_robots( $output, $is_public ) {
		if ( $is_public ) {
			$output .= "\nSitemap: " . esc_url( $this->index->get_index_url() ) . "\n";
		}

		return $output;
	}
}
ild_query( $params, '', '&' );
		}

		return home_url( $basename );
	}

	/**
	 * Returns the list of supported object subtypes exposed by the provider.
	 *
	 * @since 5.5.0
	 *
	 * @return array List of object subtypes objects keyed by their name.
	 */
	public function get_object_subtypes() {
		return array();
	}
}