function loadDataFromList()
{
$list = $this->getListOfUris();
$viewerUri = $this->getViewer();
logDebug("Viewer URI is {$viewerUri}");
$this->viewQuery = $this->SparqlWriter->getViewQueryForUriList($list, $viewerUri);
if (LOG_VIEW_QUERIES) {
logViewQuery($this->Request, $this->viewQuery);
}
$response = $this->SparqlEndpoint->graph($this->viewQuery, PUELIA_RDF_ACCEPT_MIMES);
if ($response->is_success()) {
$rdf = $response->body;
if (isset($response->headers['content-type'])) {
if (strpos($response->headers['content-type'], 'turtle')) {
$this->DataGraph->add_turtle($rdf);
} else {
$this->DataGraph->add_rdf($rdf);
}
} else {
$this->DataGraph->add_rdf($rdf);
}
$listUri = $this->Request->getUriWithoutParam(array('_view', '_page'), 'strip extension');
$this->listUri = $listUri;
$pageUri = $this->Request->getUriWithPageParam();
$currentPage = $this->Request->getPage();
$this->DataGraph->add_resource_triple($listUri, API . 'definition', $this->endpointUrl);
$this->DataGraph->add_resource_triple($listUri, RDF_TYPE, API . 'List');
$this->DataGraph->add_resource_triple($pageUri, RDF_TYPE, API . 'Page');
if ($label = $this->ConfigGraph->getPageTitle()) {
$this->DataGraph->add_literal_triple($pageUri, RDFS_LABEL, $label);
}
$this->DataGraph->add_resource_triple($listUri, DCT . 'hasPart', $pageUri);
$this->DataGraph->add_resource_triple($pageUri, DCT . 'isPartOf', $listUri);
$this->DataGraph->add_resource_triple($pageUri, XHV . 'first', $this->Request->getUriWithPageParam(1));
if (count($list) >= $this->SparqlWriter->getLimit()) {
$this->DataGraph->add_resource_triple($pageUri, XHV . 'next', $this->Request->getUriWithPageParam($currentPage + 1));
}
if ($currentPage > 1) {
$this->DataGraph->add_resource_triple($pageUri, XHV . 'prev', $this->Request->getUriWithPageParam($currentPage - 1));
}
$this->DataGraph->add_literal_triple($pageUri, OPENSEARCH . 'itemsPerPage', $this->SparqlWriter->getLimit(), null, XSD . 'integer');
$this->DataGraph->add_literal_triple($pageUri, OPENSEARCH . 'startIndex', $this->SparqlWriter->getOffset(), null, XSD . 'integer');
$this->DataGraph->add_literal_triple($pageUri, DCT . 'modified', date("Y-m-d\\TH:i:s"), null, XSD . 'dateTime');
$rdfListUri = '_:itemsList';
if ($datasetUri = $this->ConfigGraph->getDatasetUri()) {
$this->DataGraph->add_resource_triple($pageUri, VOID . 'inDataset', $datasetUri);
}
$this->DataGraph->add_resource_triple($pageUri, API . 'items', $rdfListUri);
$this->DataGraph->add_resource_triple($rdfListUri, RDF_TYPE, RDF_LIST);
foreach ($list as $no => $resourceUri) {
$nextNo = $no + 1;
$nextList = $no + 1 == count($list) ? RDF_NIL : '_:itemsList' . $nextNo;
$this->DataGraph->add_resource_triple($rdfListUri, RDF_FIRST, $resourceUri);
$this->DataGraph->add_resource_triple($rdfListUri, RDF_REST, $nextList);
$rdfListUri = $nextList;
}
} else {
logError("Endpoint returned {$response->status_code} {$response->body} View Query <<<{$this->viewQuery}>>> failed against {$this->SparqlEndpoint->uri}");
$this->setStatusCode(HTTP_Internal_Server_Error);
$this->errorMessages[] = "The SPARQL endpoint used by this URI configuration did not return a successful response.";
}
}
function loadDataFromExternalService()
{
$uriWithoutExtension = $this->Request->getOrderedUriWithoutExtensionAndReservedParams();
logDebug("Generating graph name from: {$uriWithoutExtension}");
$graphName = OPS_API . '/' . hash("crc32", $uriWithoutExtension);
$checkDatastore = $this->decideToCheckTripleStore($uriWithoutExtension);
if ($checkDatastore == true) {
//build query
$this->pageUri = $this->Request->getUriWithoutPageParam();
$viewer = $this->getViewer();
$this->viewQuery = $this->SparqlWriter->getViewQueryForExternalService($graphName, $this->pageUri, $viewer);
if (LOG_VIEW_QUERIES) {
logViewQuery($this->Request, $this->viewQuery);
}
//query the data store
$response = $this->SparqlEndpoint->graph($this->viewQuery, PUELIA_RDF_ACCEPT_MIMES);
//TODO use appropriate mime in the future
if ($response->is_success()) {
$this->DataGraph->add_rdf($response->body);
if (!$this->DataGraph->is_empty()) {
//no data returned
$this->DataGraph->add_resource_triple($this->Request->getUri(), API . 'definition', $this->endpointUrl);
//we have data in the datastore, so serve it directly
return;
} else {
logDebug("Data not found at: {$this->SparqlEndpoint->uri}, going to external service");
}
} else {
logError("Endpoint returned {$response->status_code} {$response->body} View Query <<<{$this->viewQuery}>>> failed against {$this->SparqlEndpoint->uri}");
}
}
//match api:uriTemplate, extract parameters and fill in api:externalRequestTemplate
$externalServiceRequest = $this->ConfigGraph->getExternalServiceRequest();
logDebug("External service request: " . $externalServiceRequest);
try {
$rdfData = $this->retrieveRDFDataFromExternalService($externalServiceRequest, '');
} catch (EmptyResponseException $e) {
logError("EmptyResponseException: " . $e->getMessage());
$this->setStatusCode(HTTP_Not_Found);
$this->errorMessages[] = $e->getMessage();
$this->serve();
exit;
} catch (TimeoutException $e) {
logError("TimeoutException: " . $e->getMessage());
$this->setStatusCode(HTTP_Gateway_Timeout);
$this->errorMessages[] = $e->getMessage();
$this->serve();
exit;
} catch (Exception $e) {
logError("Error while loading data from external service: " . $e->getMessage());
$this->setStatusCode(HTTP_Internal_Server_Error);
$this->errorMessages[] = $e->getMessage();
$this->serve();
exit;
}
if ($this->useDatastore) {
$this->insertRDFDataIntoTripleStore($graphName, $rdfData);
}
//if we went to the external service we cache the path without extension
if ($this->decideToCacheResponse($checkDatastore)) {
LinkedDataApiCache::cacheURI($uriWithoutExtension);
}
}
