private function sort(IDataSource $dataSource)
{
if ($this->sorting === NULL) {
$this->sorting = $this->defaultSorting;
}
if ($this->sorting === NULL) {
return;
}
// Check column
list($column) = $this->sorting;
if ($column != $this->primaryKey) {
$column = $this['columns'][$column];
if (!$column->isSortable()) {
throw new InvalidArgumentException("Column '{$column->name}' is not sortable");
}
$column->setSorting();
}
$dataSource->sort($this->sorting);
}
