/**
* Convert an RDF/JSON string into the MarmottaClient metadata representation. Returns an array of the form
*
* array(
* "http://xmlns.com/foaf/0.1/name" => array(new Literal("Sepp Huber"))
* )
*
* @param $rdfjson_string
*/
function decode_metadata($uri, $rdfjson_string)
{
$result = array();
$json_array = json_decode($rdfjson_string, true);
foreach ($json_array as $subject => $properties) {
if ($uri == $subject) {
foreach ($properties as $property => $objects) {
$result[$property] = array();
foreach ($objects as $object) {
$result[$property][] = decode_node($object);
}
}
}
}
return $result;
}
/**
* Evaluate the LDPath program passed as second argument starting at the resource identified by the uri given as first argument.
* Returns a map from field names to lists of RDFNode objects, representing the results of the evaluation.
*
* @param $uri
* @param $program
*/
public function evaluateProgram($uri, $program)
{
$serviceUrl = $this->config->getBaseUrl() . LDPathClient::$URL_PROGRAM_SERVICE . urlencode($program) . "&uri=" . urlencode($uri);
try {
$client = new Client();
$request = $client->get($serviceUrl, array("User-Agent" => "Marmotta Client Library (PHP)", "Accept" => "application/json"));
// set authentication if given in configuration
if (!is_null($this->config->getUsername())) {
$request->setAuth($this->config->getUsername(), $this->config->getPassword());
}
$response = $request->send();
$query_result = json_decode($response->getBody(true), true);
$result = array();
foreach ($query_result as $field => $value) {
$result[$field] = array();
foreach ($value as $node) {
$result[$field][] = decode_node($node);
}
}
return $result;
} catch (BadResponseException $ex) {
throw new MarmottaClientException("error evaluating LDPath Query {$path}; " . $ex->getResponse()->getReasonPhrase());
}
}
