private function ensureVisitorSetup()
{
if (!$this->visitor) {
$navigator = new Navigator();
$this->visitor = new CandidateTermVisitor();
$this->ensureDocumentLoaded();
$navigator->walk($this->document, $this->visitor);
}
}
public static function findConceptsByXPath(databox $databox, $expression)
{
$document = self::thesaurusFromDatabox($databox);
$xpath = new DOMXPath($document);
$nodes = $xpath->query($expression);
$concepts = [];
foreach ($nodes as $node) {
$path_segments = [];
$me_and_parents = [$node];
foreach (self::getElementAncestors($node) as $me_and_parents[]) {
}
foreach ($me_and_parents as $node) {
if (Navigator::isConcept($node)) {
$path_segments[] = self::conceptPathSegment($node);
} else {
// Silently skips invalid targeted nodes
break;
}
}
// Concept paths are have databox identifier at root level
$concepts[] = new Concept(sprintf('/%d/%s', $databox->get_sbas_id(), implode('/', array_reverse($path_segments))));
}
return $concepts;
}
