/**
* Helper method to group changes for $changeUri of a given type by namespaced predicate
* @param \Tripod\ChangeSet $cs
* @param array $changes
* @return array
* @throws \Tripod\Exceptions\Exception
*/
private function getChangesGroupedByNsPredicate(\Tripod\ChangeSet $cs, $changeUri, $changePredicate)
{
$changes = $cs->get_subject_property_values($changeUri, $changePredicate);
$changesGroupedByNsPredicate = array();
foreach ($changes as $c) {
$predicate = $cs->get_first_resource($c["value"], $this->labeller->qname_to_uri("rdf:predicate"));
$nsPredicate = $this->labeller->uri_to_qname($predicate);
if (!array_key_exists($nsPredicate, $changesGroupedByNsPredicate)) {
$changesGroupedByNsPredicate[$nsPredicate] = array();
}
$object = $cs->get_subject_property_values($c["value"], $this->labeller->qname_to_uri("rdf:object"));
if (count($object) != 1) {
$this->getLogger()->error("Expecting object array with exactly 1 element", $object);
throw new \Tripod\Exceptions\Exception("Object of removal malformed");
}
$valueType = $object[0]['type'] == "uri" ? VALUE_URI : VALUE_LITERAL;
$value = $valueType === VALUE_URI ? $this->labeller->uri_to_alias($object[0]["value"]) : $object[0]["value"];
$changesGroupedByNsPredicate[$nsPredicate][] = array($valueType => $value);
}
return $changesGroupedByNsPredicate;
}
