/**
* Resolve a graph pattern query (/all route)
*
* @param string $format The format of the request
*
* @return \Response
*/
public function solveQuery($format = null)
{
$data;
if (!empty($format)) {
$format = ltrim($format, '.');
}
// Ignore the rest of the uri after /all and work with the request parameters as they were given
$cache_string = sha1($this->getRawRequestURI(\Request::root()));
// Check if the response to the query has been cached already
if (Cache::has($cache_string)) {
$data = Cache::get($cache_string);
} else {
// Get the graph pattern query string parameters from the request
list($s, $p, $o) = $this->getTemplateParameters();
// Pass them to our sparql query builder
SparqlQueryBuilder::setParameters(array($s, $p, $o));
$base_uri = null;
// If no parameter has been filled in, the URI we have to match triples with is the root of our application
if ($s == '?s' && $p == '?p' && $o == '?o') {
$base_uri = \Request::root();
}
// Fetch matching triples
$result = $this->triples->getTriples($base_uri, \Request::get('limit', 100), \Request::get('offset', 0));
// If the graph contains no triples, then the graph pattern couldn't resolve to anything, 404 it is
if ($result->countTriples() == 0) {
\App::abort(404, "The resource couldn't be found, nor dereferenced.");
}
$definition = array('resource_name' => "all", 'collection_uri' => "");
$source_definition = array('description' => 'Semantic data collected out the configured semantic data sources.', 'type' => 'Semantic');
$data = new Data();
$data->definition = $definition;
$data->source_definition = $source_definition;
$data->data = $result;
$data->is_semantic = true;
// Add the available, supported formats to the object
$format_helper = new FormatHelper();
$data->formats = $format_helper->getAvailableFormats($data);
// Store in cache for a default of 5 minutes
Cache::put($cache_string, $data, 5);
}
// Add the hydra namespace, it's not present in the easy rdf namespaces by default
\EasyRdf_Namespace::set('hydra', 'http://www.w3.org/ns/hydra/core#');
// Return the formatted response with content negotiation
$response = ContentNegotiator::getResponse($data, $format);
// Pass a Vary header so that browsers know they have to take the accept header
// into consideration when they apply caching client side
$response->header('Vary', 'Accept');
// Allow CORS
$response->header('Access-Control-Allow-Origin', '*');
return $response;
}
