/**
* Invalidates according graph Uri entries, the result and all triple pattern.
*
* @param Query $queryObject All data according to this query will be invalidated.
*/
public function invalidateByQuery(Query $queryObject)
{
// log it
$this->addToLog(array('method' => 'invalidateByQuery', 'parameter' => array('queryObject' => $queryObject)));
$query = $queryObject->getQuery();
// load query cache container by given query
$queryCacheContainer = $this->cache->load($query);
/**
* remove according query from the query list which belongs to one of the graph URI's in the query
* cache container.
*/
if (true === is_array($queryCacheContainer['graph_uris'])) {
foreach ($queryCacheContainer['graph_uris'] as $graphUri) {
$queryList = $this->cache->load($graphUri);
unset($queryList[$query]);
// if graphUri entry is empty after the operation, remove it from the cache
if (0 == count($queryList)) {
$this->cache->remove($graphUri);
// otherwise save updated entry
} else {
$this->cache->save($graphUri, $queryList);
}
}
}
// check for according triple pattern
if (true === is_array($queryCacheContainer['triple_pattern'])) {
foreach ($queryCacheContainer['triple_pattern'] as $patternKey) {
$queryList = $this->cache->load($patternKey);
unset($queryList[$query]);
// if patternKey entry is empty after the operation, remove it from the cache
if (0 == count($queryList)) {
$this->cache->remove($patternKey);
// otherwise save updated entry
} else {
$this->cache->save($patternKey, $queryList);
}
}
}
/**
* Remove query cache container
*/
$this->cache->remove($query);
}
/**
* Create Statement instance based on a given Query instance.
*
* @param Query $queryObject Query object which represents a SPARQL query.
* @return Statement Statement object
* @throws \Exception If query contains more than one triple pattern.
* @throws \Exception If more than one graph was found.
*/
protected function getStatement(Query $queryObject)
{
$queryParts = $queryObject->getQueryParts();
$tupleInformaton = null;
$tupleType = null;
/**
* Use triple pattern
*/
if (true === isset($queryParts['triple_pattern'])) {
$tupleInformation = $queryParts['triple_pattern'];
$tupleType = 'triple';
/**
* Use quad pattern
*/
} elseif (true === isset($queryParts['quad_pattern'])) {
$tupleInformation = $queryParts['quad_pattern'];
$tupleType = 'quad';
/**
* Neither triple nor quad information
*/
} else {
throw new \Exception('Neither triple nor quad information available in given query object: ' . $queryObject->getQuery());
}
if (1 > count($tupleInformation)) {
throw new \Exception('Query contains more than one triple- respectivly quad pattern.');
}
/**
* Triple
*/
if ('triple' == $tupleType) {
$subject = $this->createNodeByValueAndType($tupleInformation[0]['s'], $tupleInformation[0]['s_type']);
$predicate = $this->createNodeByValueAndType($tupleInformation[0]['p'], $tupleInformation[0]['p_type']);
$object = $this->createNodeByValueAndType($tupleInformation[0]['o'], $tupleInformation[0]['o_type']);
$graph = null;
/**
* Quad
*/
} elseif ('quad' == $tupleType) {
$subject = $this->createNodeByValueAndType($tupleInformation[0]['s'], $tupleInformation[0]['s_type']);
$predicate = $this->createNodeByValueAndType($tupleInformation[0]['p'], $tupleInformation[0]['p_type']);
$object = $this->createNodeByValueAndType($tupleInformation[0]['o'], $tupleInformation[0]['o_type']);
$graph = $this->createNodeByValueAndType($tupleInformation[0]['g'], 'uri');
}
// no else neccessary, because otherwise the upper exception would be thrown if tupleType is neither
// quad or triple.
return $this->statementFactory->createStatement($subject, $predicate, $object, $graph);
}
