/**
* Short description of method unReferenceResource
*
* @access public
* @author Joel Bout, <*****@*****.**>
* @param Resource resource
* @return boolean
*/
public function unReferenceResource(\core_kernel_classes_Resource $resource)
{
$returnValue = (bool) false;
if ($this->isResourceReferenced($resource)) {
$dbWrapper = \core_kernel_classes_DbWrapper::singleton();
//select id to be removed:
$resourceId = Utils::getResourceIdByTable($resource, 'resource_to_table');
if ($resourceId) {
$queries[] = 'DELETE FROM "resource_has_class" WHERE "resource_has_class"."resource_id" = \'' . $resourceId . '\';';
$queries[] = 'DELETE FROM "resource_to_table" WHERE "resource_to_table"."id" = \'' . $resourceId . '\';';
$returnValue = true;
foreach ($queries as $query) {
$result = $dbWrapper->exec($query);
if ($result === false) {
$returnValue = false;
}
}
if ($returnValue !== false) {
if (array_key_exists($resource->getUri(), self::$_resources)) {
unset(self::$_resources[$resource->getUri()]);
}
}
}
}
return (bool) $returnValue;
}
/**
* Short description of method delete
*
* @access public
* @author Joel Bout, <*****@*****.**>
* @param Resource resource
* @param boolean deleteReference
* @return boolean
*/
public function delete(\core_kernel_classes_Resource $resource, $deleteReference = false)
{
$returnValue = (bool) false;
$dbWrapper = \core_kernel_classes_DbWrapper::singleton();
$tableName = ResourceReferencer::singleton()->resourceLocation($resource);
if (empty($tableName)) {
return $returnValue;
}
$uri = $resource->getUri();
$resourceId = HardapiUtils::getResourceIdByTable($resource, $tableName);
if ($resourceId) {
/*
* Delete all the references of the resource first, before the resource is delete of course,
* if the parameter $deleteReference is true
*/
if ($deleteReference) {
$properties = array();
//get the resource classes (type)
$types = '';
foreach ($resource->getTypes() as $type) {
$properties[$type->getUri()] = array();
$types = "'" . $type->getUri() . "',";
}
$types = substr($types, 0, strlen($types) - 1);
if (!empty($types)) {
//get all the properties that have one of the resource class as range
$sqlQuery = 'SELECT "subject", "object" FROM "statements" WHERE "predicate" = \'' . RDFS_RANGE . '\' AND object IN (' . $types . ')';
$result = $dbWrapper->query($sqlQuery);
while ($row = $result->fetch()) {
//fill the properties range: propertyUri => domains:
$propertyUri = $row['subject'];
$rangeUri = $row['object'];
$properties[$rangeUri][$propertyUri] = array();
//get the domain of the property:
$property = new \core_kernel_classes_Property($propertyUri);
foreach ($property->getDomain()->getIterator() as $domain) {
if ($domain instanceof \core_kernel_classes_Class) {
$properties[$rangeUri][$propertyUri][] = $domain->getUri();
}
}
}
//delete the references
$referencer = ResourceReferencer::singleton();
foreach ($properties as $rangeUri => $propertyUris) {
foreach ($propertyUris as $propertyUri => $domains) {
//property -> column
$property = new \core_kernel_classes_Property($propertyUri);
$isMulti = $property->isMultiple() || $property->isLgDependent();
$columnName = '';
if (!$isMulti) {
$columnName = HardapiUtils::getShortName($property);
if (empty($columnName)) {
continue;
}
}
foreach ($domains as $domainUri) {
//classLocations -> table
$classLocations = $referencer->classLocations(new \core_kernel_classes_Class($domainUri));
foreach ($classLocations as $classLocation) {
if ($property->isMultiple()) {
//delete the row in the props table
$query = 'DELETE FROM "' . $classLocation['table'] . 'props"
WHERE "property_uri" = ?
AND ("property_value" = ? OR "property_foreign_uri" = ?)';
$dbWrapper->exec($query, array($propertyUri, $uri, $uri));
} else {
//set the col value to NULL
$query = 'UPDATE "' . $classLocation['table'] . '"
SET "' . $columnName . '" = NULL
WHERE "' . $columnName . '" = ?';
$dbWrapper->exec($query, array($uri));
}
}
}
}
}
}
}
$queries = array();
// Delete records in the main table
$queries[] = 'DELETE FROM "' . $tableName . '" WHERE "id" = \'' . $resourceId . '\'';
// Delete records in the properties table
$queries[] = 'DELETE FROM "' . $tableName . 'props" WHERE "instance_id" = \'' . $resourceId . '\'';
foreach ($queries as $query) {
try {
$result = $dbWrapper->exec($query);
if ($result === false) {
$returnValue = false;
break;
} else {
$returnValue = true;
}
} catch (\PDOException $e) {
throw new Exception("Unable to delete resource ({$resource->getUri()}) ;" . $e->getMessage());
}
}
// Unreference the resource
ResourceReferencer::singleton()->unReferenceResource($resource);
}
return (bool) $returnValue;
}
