admin_notices – Jigoshop validation

/**
 * Hooks the WP admin_notices action to add in a notice
 * if the Mediaburst credentials aren't added in settings.
 *
 * @return void
 **/
public function admin_notices() {
    if ( 'yes' == get_option( 'mbesms_jigobase_admin_notifications' ) && ! trim( get_option( 'mbesms_jigobase_admin_number' ) ) ) {
        $url = admin_url( '/admin.php?page=settings' );
        $this->render_admin_error( sprintf( __( '<strong>Jigoshop SMS error:</strong> To enable Admin SMS notifications, please enter an admin mobile number and admin country on the “SMS” tab in the <a href="%s">Jigoshop Settings</a>, alternatively set “admin SMS notifications” to “no”.', 'jigoshopsms' ), $url ) );
    }
    if ( strlen( get_option( 'mbesms_jigobase_from' ) ) > 11 )
        $this->show_from_length_error();
}