/**
* Adds writing an attribute to a grouped writing/deletion process.
*
* Set of values is filtered to exclude all empty strings. If resulting
* set is empty whole attribute is deleted.
*
* @throws protocol_exception
* @param attribute $attribute attribute to be adjusted
* @param array $values set of values to be assigned to selected attribute
* @return node current instance
*/
public function adjust(attribute $attribute, $values)
{
if (!is_array($this->adjustment)) {
throw new protocol_exception('invalid use of grouped writing', $this->link, $this->getDN());
}
$this->adjustment[$attribute->getName()] = array_filter(array_map(function ($a) {
return trim($a);
}, $values), function ($a) {
return $a !== '';
});
return $this;
}
