/**
* Return all filter columns with their optional label as key
*
* This will merge the results of self::getColumns(), self::getStaticFilterColumns() and
* self::getDynamicFilterColumns() *once*. (i.e. subsequent calls of this function will
* return the same result.)
*
* @return array
*/
public function getFilterColumns()
{
if ($this->filterColumns === null) {
$columns = array_merge($this->getColumns(), $this->getStaticFilterColumns(), $this->getDynamicFilterColumns());
$this->filterColumns = array();
foreach ($columns as $label => $column) {
if (is_int($label)) {
$label = ucwords(str_replace('_', ' ', $column));
}
if ($this->query->isCaseInsensitive($column)) {
$label .= ' ' . t('(Case insensitive)');
}
$this->filterColumns[$label] = $column;
}
}
return $this->filterColumns;
}
