/**
* Prepares everything for SparqlEngine-usage
* Loads the files, creates instances for SparqlEngine and
* Dataset...
*
* @return array First value is the sparql engine, second the dataset
*/
function _prepareSparql()
{
require_once RDFAPI_INCLUDE_DIR . 'sparql/SparqlEngine.php';
require_once RDFAPI_INCLUDE_DIR . 'dataset/DatasetMem.php';
$dataset = new DatasetMem();
$dataset->setDefaultGraph($this);
return array(SparqlEngine::factory($this), $dataset);
}
/**
* tests functions on dataset level
*/
function testDatatset()
{
$_SESSION['test'] = 'Dataset operations tests';
$quad1 = new Quad(new Resource('http://graph1'), new Resource('http://subject1'), new Resource('http://predicate1'), new Resource('http://object1'));
$quad2 = new Quad(new Resource('http://graph2'), new Resource('http://subject2'), new Resource('http://predicate2'), new Literal('http://object2'));
$quad3 = new Quad(new Resource('http://graph3'), new Resource('http://subject3'), new Resource('http://predicate3'), new BlankNode('http://object3'));
$dataset = new DatasetMem('Dataset1');
$dataset2 = new DatasetMem('Dataset2');
$dataset2->addQuad($quad1);
$dataset2->addQuad($quad2);
$dataset->addQuad($quad3);
$dataset->addAll($dataset2);
$it = $dataset->findInNamedGraphs(null, null, null, null);
$i = 0;
while ($it->valid()) {
$i++;
$it->next();
}
$this->assertEqual(3, $i);
$this->assertEqual(3, $dataset->countQuads());
$this->assertTrue($dataset->containsQuad($quad1->getGraphName(), $quad1->getSubject(), $quad1->getPredicate(), $quad1->getObject()));
$this->assertTrue($dataset->containsQuad($quad2->getGraphName(), $quad2->getSubject(), $quad2->getPredicate(), $quad2->getObject()));
$this->assertTrue($dataset->containsQuad($quad3->getGraphName(), $quad3->getSubject(), $quad3->getPredicate(), $quad3->getObject()));
$dataset->removeQuad($quad3);
$this->assertEqual(2, $dataset->countQuads());
$this->assertTrue($dataset->containsQuad($quad1->getGraphName(), $quad1->getSubject(), $quad1->getPredicate(), $quad1->getObject()));
$this->assertTrue($dataset->containsQuad($quad2->getGraphName(), $quad2->getSubject(), $quad2->getPredicate(), $quad2->getObject()));
$this->assertFalse($dataset->containsQuad($quad3->getGraphName(), $quad3->getSubject(), $quad3->getPredicate(), $quad3->getObject()));
}
/**
* Performs a SPARQL query against a model. The model is converted to
* an RDF Dataset. The result can be retrived in SPARQL Query Results XML Format or
* as an array containing the variables an their bindings.
*
* @param String $query the sparql query string
* @param String $resultform the result form ('xml' for SPARQL Query Results XML Format)
* @return String/array
*/
function sparqlQuery($query, $resultform = false)
{
include_once RDFAPI_INCLUDE_DIR . PACKAGE_SPARQL;
include_once RDFAPI_INCLUDE_DIR . PACKAGE_DATASET;
$dataset = new DatasetMem();
$dataset->setDefaultGraph($this);
$parser = new SparqlParser();
$q = $parser->parse($query);
$eng = new SparqlEngine();
return $eng->queryModel($dataset, $q, $resultform);
}
