/**
* Answers a SPARQL query.
*
* @param string $rawQuery
* @return SPARQL XML string
* @throws Exception, SOAPExeption
*/
function answerSPARQL($query, $params)
{
global $wgServer, $wgScript, $smwgWebserviceProtocol, $smwgWebserviceUser, $smwgWebservicePassword;
if (isset($smwgWebserviceProtocol) && strtolower($smwgWebserviceProtocol) === 'rest') {
global $smwgTripleStoreGraph;
if (stripos(trim($query), 'SELECT') === 0 || stripos(trim($query), 'PREFIX') === 0) {
// SPARQL, attach common prefixes
$query = TSNamespaces::getAllPrefixes() . $query;
}
$queryRequest = "<query>";
$queryRequest .= "<text><![CDATA[{$query}]]></text>";
$queryRequest .= "<params><![CDATA[{$params}]]></params>";
$queryRequest .= "<graph><![CDATA[{$smwgTripleStoreGraph}]]></graph>";
$queryRequest .= "</query>";
global $smwgWebserviceUser, $smwgWebservicePassword, $smwgWebserviceEndpoint;
list($host, $port) = explode(":", $smwgWebserviceEndpoint);
$credentials = isset($smwgWebserviceUser) ? $smwgWebserviceUser . ":" . $smwgWebservicePassword : "";
$queryClient = new RESTWebserviceConnector($host, $port, "sparql", $credentials);
list($header, $status, $result) = $queryClient->send($queryRequest);
if ($status != 200) {
throw new Exception(strip_tags($result), $status);
}
return $result;
} else {
trigger_error("SOAP requests to TSC are not supported anymore.");
}
}
public function query($query, $params = "", $graph = "")
{
global $smwgTripleStoreGraph;
if (empty($graph)) {
$graph = $smwgTripleStoreGraph;
}
if (stripos(trim($query), 'SELECT') === 0 || stripos(trim($query), 'PREFIX') === 0) {
// SPARQL, attach common prefixes
$query = TSNamespaces::getAllPrefixes() . $query;
}
$queryRequest = "query=" . urlencode($query);
$queryRequest .= "&default-graph-uri=" . urlencode($graph);
$queryRequest .= "¶ms=" . urlencode($params);
list($header, $status, $result) = $this->queryClient->send($queryRequest);
if ($status != 200) {
throw new Exception(strip_tags($result), $status);
}
return $result;
}
public function addWSAsDataSource($wsId)
{
if (defined('LOD_LINKEDDATA_VERSION')) {
global $IP;
$this->removeWSFromDataSourceInformationGraph($wsId);
//require_once($IP."/extensions/LinkedData/storage/TripleStore/LOD_PersistentTripleStoreAccess.php");
//require_once($IP."/extensions/LinkedData/storage/TripleStore/LOD_Triple.php");
$tsA = new LODPersistentTripleStoreAccess(true);
$lAS = LODAdministrationStore::getInstance();
$tsA->createGraph($lAS->getSMWGraphsURI() . 'DataSourceInformationGraph');
$tsA->addPrefixes(TSNamespaces::getAllPrefixes());
$tsA->addPrefixes(LODAdministrationStore::getInstance()->getSourceDefinitionPrefixes());
$triples = array();
$triples[] = new LODTriple($this->getDataSourceURI("WS_" . $wsId), "rdf:type", "smw-lde:Datasource", "__objectURI");
$triples[] = new LODTriple($this->getDataSourceURI("WS_" . $wsId), "smw-lde:label", Title::newFromID($wsId)->getFullText(), "xsd:string");
$triples[] = new LODTriple($this->getDataSourceURI("WS_" . $wsId), "smw-lde:ID", Title::newFromID($wsId)->getFullText(), "xsd:string");
//todo: deal with persistency id=wsid
$tsA->insertTriples($lAS->getSMWGraphsURI() . 'DataSourceInformationGraph', $triples);
$tsA->flushCommands('di_ws', $wsId . '_dsinfo');
}
}
private function getSPARQLQueryParts($query)
{
//todo:deal with categories
$properties = array();
$categories = array();
$description = $query->getDescription();
$extraPrintOuts = $query->getExtraPrintouts();
if (!$description instanceof SMWSPARQLDescription) {
//echo('<pre>'.print_r($description, true).'</pre>');
//echo('<pre>'.print_r($extraPrintOuts, true).'</pre>');
list($properties, $categories) = $this->getQueryParts($description);
} else {
if (!class_exists('ARC2')) {
global $smwgHaloIP;
require_once "{$smwgHaloIP}/libs/arc/ARC2.php";
}
$prefixes = str_replace(':<', ': <', TSNamespaces::getAllPrefixes());
$queryString = $prefixes . $query->getQueryString();
$parser = ARC2::getSPARQLParser();
$parser->parse($queryString);
$queryInfo = $parser->getQueryInfos();
if (array_key_exists('query', $queryInfo)) {
if ($queryInfo['query']['type'] == 'select') {
list($properties, $categories) = $this->getPropertiesInSPARQLPattern($queryInfo['query']['pattern'], $queryInfo['prefixes']['prop:'], $queryInfo['prefixes']['rdf:'] . 'type', $queryInfo['prefixes']['cat:']);
}
}
}
//deal with extra printouts
$properties = array_merge($properties, $this->getPrintRequestsProperties($extraPrintOuts));
return array($properties, $categories);
}
