/**
* 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 $abstracts should AbstractExtractor be added?
* TODO: Create an interface ExtractorBuilder with methods addProperties() and createExtractor().
* Give this method an array of ExtractorBuilders.
*/
public function loadMappings($ontology, $context, $abstracts = true)
{
$mappingPages = $this->loadAllPages($this->mappingDir);
$extractor = new ExtractionManager();
$extractor->addExtractor(MappingExtractor::load($mappingPages, $ontology, $context));
$extractor->addExtractor(\dbpedia\mapping\LabelExtractor::load($ontology, $context));
if ($abstracts) {
$extractor->addExtractor(\dbpedia\mapping\AbstractExtractor::load($ontology, $context));
}
$this->destroyAllPages($mappingPages);
return $extractor;
}