/**
* Ensure that the graph we want to persist has data with valid cardinality.
*
* @param \Tripod\ExtendedGraph $graph
* @throws \Tripod\Exceptions\CardinalityException
*/
protected function validateGraphCardinality(\Tripod\ExtendedGraph $graph)
{
$config = Config::getInstance();
$cardinality = $config->getCardinality($this->getStoreName(), $this->getPodName());
$namespaces = $config->getNamespaces();
$graphSubjects = $graph->get_subjects();
if (empty($cardinality) || $graph->is_empty()) {
return;
}
foreach ($cardinality as $qname => $cardinalityValue) {
list($namespace, $predicateName) = explode(':', $qname);
if (!array_key_exists($namespace, $namespaces)) {
//TODO This may be changed to a namespace exception at some point...
throw new \Tripod\Exceptions\CardinalityException("Namespace '{$namespace}' not defined for qname: {$qname}");
}
// NB: The only constraint we currently support is a value of 1 to enforce one triple per subject/predicate.
if ($cardinalityValue == 1) {
foreach ($graphSubjects as $subjectUri) {
$predicateUri = $namespaces[$namespace] . $predicateName;
$predicateValues = $graph->get_subject_property_values($subjectUri, $predicateUri);
if (count($predicateValues) > 1) {
$v = array();
foreach ($predicateValues as $predicateValue) {
$v[] = $predicateValue['value'];
}
throw new \Tripod\Exceptions\CardinalityException("Cardinality failed on {$subjectUri} for '{$qname}' - should only have 1 value and has: " . implode(', ', $v));
}
}
}
}
}