/**
* Return an array of ternary arrays (subject predicate object) of
* SMWExpElements that represents the flattened version of this data.
*
* @return array of array of SMWExpElement
*/
public function getTripleList(Element $subject = null)
{
global $smwgBnodeCount;
if (!isset($smwgBnodeCount)) {
$smwgBnodeCount = 0;
}
if ($subject == null) {
$subject = $this->m_subject;
}
$result = array();
foreach ($this->m_edges as $key => $edge) {
foreach ($this->m_children[$key] as $childElement) {
if ($childElement instanceof SMWExpData) {
$childSubject = $childElement->getSubject();
} else {
$childSubject = $childElement;
}
if ($childSubject instanceof SMWExpResource && $childSubject->isBlankNode()) {
// bnode, rename ID to avoid unifying bnodes of different contexts
// TODO: should we really rename bnodes of the form "_id" here?
$childSubject = new SMWExpResource('_' . $smwgBnodeCount++, $childSubject->getDataItem());
}
$result[] = array($subject, $edge, $childSubject);
if ($childElement instanceof SMWExpData) {
// recursively add child's triples
$result = array_merge($result, $childElement->getTripleList($childSubject));
}
}
}
return $result;
}
