/**
* @param string $modelIri The IRI, which identifies the model.
* @param boolean $useAc Whether to use access control or not.
* @throws Erfurt_Store_Exception if the requested model is not available.
* @return Erfurt_Rdf_Model Returns an instance of Erfurt_Rdf_Model or one of its subclasses.
*/
public function getModel($modelIri, $useAc = true)
{
// check whether model exists and is visible
if (!$this->isModelAvailable($modelIri, $useAc)) {
$systemModelUri = $this->getOption('modelUri');
$systemSchemaUri = $this->getOption('schemaUri');
// check whether requested model is one of the schema models
if (!$useAc && ($modelIri === $systemModelUri || $modelIri === $systemSchemaUri)) {
try {
$this->checkSetup();
} catch (Erfurt_Store_Exception $e) {
if ($e->getCode() === 20) {
// Everything is fine, system models now imported
} else {
throw $e;
}
}
// still not available?
if (!$this->isModelAvailable($modelIri, $useAc)) {
throw new Erfurt_Store_Exception('Model "' . $modelIri . '" is not available.');
}
} else {
throw new Erfurt_Store_Exception('Model "' . $modelIri . '" is not available.');
}
}
// if backend adapter provides its own implementation
if (method_exists($this->_backendAdapter, 'getModel')) {
// … use it
$modelInstance = $this->_backendAdapter->getModel($modelIri);
} else {
//add here the userid to the identifier
$modelType = null;
$identity = null;
$identityObject = Erfurt_App::getInstance()->getAuth()->getIdentity();
if (null !== $identityObject) {
$identity = Erfurt_App::getInstance()->getAuth()->getIdentity()->getUri();
}
if (isset($this->_allowedModels[$identity][$modelIri])) {
$modelType = $this->_allowedModels[$identity][$modelIri];
} else {
// use generic implementation
$owlQuery = new Erfurt_Sparql_SimpleQuery();
$owlQuery->setProloguePart('ASK')->addFrom($modelIri)->setWherePart('{<' . $modelIri . '> <' . EF_RDF_NS . 'type> <' . EF_OWL_ONTOLOGY . '>.}');
if ($this->sparqlAsk($owlQuery, array(Erfurt_Store::USE_AC => $useAc))) {
// instantiate OWL model
$this->_allowedModels[$identity][$modelIri] = self::MODEL_TYPE_OWL;
$modelType = self::MODEL_TYPE_OWL;
} else {
// instantiate RDF-S model
$this->_allowedModels[$identity][$modelIri] = self::MODEL_TYPE_RDFS;
$modelType = self::MODEL_TYPE_RDFS;
}
}
switch ($modelType) {
case self::MODEL_TYPE_OWL:
$modelInstance = new Erfurt_Owl_Model($modelIri);
break;
case self::MODEL_TYPE_RDFS:
$modelInstance = new Erfurt_Rdfs_Model($modelIri);
break;
default:
//should never happen
throw new Erfurt_Store_Exception("Model '{$modelIri}' is not available.");
}
}
// check for edit possibility
if ($this->_checkAc($modelIri, 'edit', $useAc)) {
$modelInstance->setEditable(true);
} else {
$modelInstance->setEditable(false);
}
return $modelInstance;
}
/**
* Resource factory method
*
* @return Erfurt_Owl_Resource
*/
public function getResource($resourceIri)
{
return parent::getResource($resourceIri);
}
