/**
* 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 (null !== $graph) {
$graphUri = $graph->getUri();
// no graph information given, use default graph
} elseif (null === $graph && null === $statement->getGraph()) {
$graphUri = 'http://saft/defaultGraph/';
// no graph given, use graph information from $statement
} elseif (null === $graph && $statement->getGraph()->isNamed()) {
$graphUri = $statement->getGraph()->getUri();
// no graph given, use graph information from $statement
} elseif (null === $graph && false == $statement->getGraph()->isNamed()) {
$graphUri = 'http://saft/defaultGraph/';
}
// use hash to differenciate between statements (no doublings allowed)
$statementHash = hash('sha256', json_encode($statement));
// check it
return isset($this->statements[$graphUri][$statementHash]);
}
/**
* Removes all statements from a (default-) graph which match with given statement.
*
* @param Statement $statement It can be either a concrete or pattern-statement.
* @param Node $graph optional Overrides target graph. If set, all statements will
* be delete in that graph.
* @param array $options optional Key-value pairs which provide additional introductions
* for the store and/or its adapter(s).
*/
public function deleteMatchingStatements(Statement $statement, Node $graph = null, array $options = array())
{
// given $graph forces usage of it and not the graph from the statement instance
if (null == $graph && null == $statement->getGraph()) {
throw new \Exception('Virtuoso is a quad store and therefore needs to know the graph to delete statements.');
}
parent::deleteMatchingStatements($statement, $graph, $options);
}
/**
* Removes all statements from a (default-) graph which match with given statement.
*
* @param Statement $statement It can be either a concrete or pattern-statement.
* @param Node $graph optional Overrides target graph. If set, all statements will
* be delete in that graph.
* @param array $options optional Key-value pairs which provide additional introductions
* for the store and/or its adapter(s).
*/
public function deleteMatchingStatements(Statement $statement, Node $graph = null, array $options = array())
{
// given $graph forces usage of it and not the graph from the statement instance
if (null !== $graph) {
// use given $graph
// use graphUri from statement
} elseif (null === $graph && null !== $statement->getGraph()) {
$graph = $statement->getGraph();
}
// create triple statement, because we have to handle the graph extra
$tripleStatement = $this->statementFactory->createStatement($statement->getSubject(), $statement->getPredicate(), $statement->getObject());
$statementIterator = $this->statementIteratorFactory->createIteratorFromArray(array($tripleStatement));
$triple = $this->sparqlFormat($statementIterator);
$query = 'DELETE ';
if (null !== $graph) {
$query .= 'FROM <' . $graph->getUri() . '> ';
}
$query .= '{' . $triple . '} WHERE {' . $triple . '}';
$this->query($query);
}
/**
* 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;
}
}
