/**
* Loads the ontology
*/
private function loadOntology()
{
if ($this->allowCaching && file_exists(self::ONTOLOGY_FILE)) {
$this->logger->info('Loading ontology from file.');
$this->ontology = unserialize(file_get_contents(self::ONTOLOGY_FILE));
} else {
//Parse ontology schema pages
$this->logger->info('Reading ontology...');
$ontologyPages = $this->loadAllPages($this->ontologySource);
//Load ontology
$ontologyReader = new OntologyReader();
$this->ontology = $ontologyReader->read($ontologyPages);
LabelExtractor::addProperties($this->ontology);
AbstractExtractor::addProperties($this->ontology);
$this->destroyAllPages($ontologyPages);
file_put_contents(self::ONTOLOGY_FILE, serialize($this->ontology));
//Show the extracted ontology
$writer = new ontology\OWLOntologyWriter();
echo $writer->toOWL($this->ontology);
}
}
/**
* @param $abstracts should properties for AbstractExtractor be added to ontology?
* TODO: Create an interface ExtractorBuilder with methods addProperties() and createExtractor().
* Give this method an array of ExtractorBuilders.
*/
public function loadOntology($abstracts = true)
{
$ontologyPages = $this->loadAllPages($this->ontologyDir);
$ontologyReader = new OntologyReader();
$ontology = $ontologyReader->read($ontologyPages);
\dbpedia\mapping\LabelExtractor::addProperties($ontology);
if ($abstracts) {
\dbpedia\mapping\AbstractExtractor::addProperties($ontology);
}
$this->destroyAllPages($ontologyPages);
return $ontology;
}
