public function getSortConditionsDefault()
    {
        $sortConditions = [];
        foreach ($this->getColumns() as $column) {
            /* @var $column \ZfcDatagrid\Column\AbstractColumn */
            if ($column->hasSortDefault() === true) {
                $sortDefaults = $column->getSortDefault();

                $sortConditions[$sortDefaults['priority']] = [
                    'column' => $column,
                    'sortDirection' => $sortDefaults['sortDirection'],
                ];

                $column->setSortActive($sortDefaults['sortDirection']);
            }
        }

        ksort($sortConditions);

        return $sortConditions;
    }