public function createRedlandNodeFromNode(Node $node)
{
if ($node instanceof NamedNode || $node instanceof Literal || $node instanceof BlankNode) {
return $node->getRedlandNode();
} elseif ($node->isNamed()) {
return $this->createNamedNode($node->getUri())->getRedlandNode();
} elseif ($node->isLiteral()) {
return $this->createLiteral($node->getValue(), $node->getDatatype(), $node->getLanguage())->getRedlandNode();
} elseif ($node->isBlank()) {
return $this->createBlankNode($node->getBlankId())->getRedlandNode();
}
throw new \Exception("This node type (" . get_class($node) . ") is not supported by Redland backend");
}
/**
* Returns true or false depending on whether or not the statements pattern
* has any matches in the given graph.
*
* @param Statement $Statement It can be either a concrete or pattern-statement.
* @param Node $graph optional Overrides target graph.
* @param array $options optional It contains key-value pairs and should provide additional
* introductions for the store and/or its adapter(s).
* @return boolean Returns true if at least one match was found, false otherwise.
*/
public function hasMatchingStatement(Statement $statement, Node $graph = null, array $options = array())
{
// if $graph was given, but its not a named node, set it to null.
if (null !== $graph && false === $graph->isNamed()) {
$graph = null;
}
// otherwise check, if graph was set in the statement and it is a named node and use it, if so.
if (null === $graph && null !== $statement->getGraph() && true === $statement->getGraph()->isNamed()) {
$graph = $statement->getGraph();
}
$statementIterator = $this->statementIteratorFactory->createIteratorFromArray(array($statement));
$result = $this->query('ASK { ' . $this->sparqlFormat($statementIterator, $graph) . '}', $options);
if (true === is_object($result)) {
return $result->getValue();
} else {
return $result;
}
}
