public function dispatch() {

		$this->header();

		$step = empty( $_GET['step'] ) ? 0 : (int) $_GET['step'];

		switch ( $step ) {

			case 0:
				$this->greet();
				break;

			case 1:
				check_admin_referer( 'import-upload' );

				if ( $this->handle_upload() ) {

					if ( $this->id ) {
						$file = get_attached_file( $this->id );
					} else {
						$file = ABSPATH . $this->file_url;
					}

					add_filter( 'http_request_timeout', array( $this, 'bump_request_timeout' ) );

					$this->import( $file );
				}
				break;
		}

		$this->footer();
	}