public function deleteObjectTree(Schema $schema, ObjectEntity $entity, $id, Audit $audit)
{
$numTerminated = 0;
// Get a set of ObjectRefs to objects that are 'owned' by the given entity and id.
// Also determine the set of all related link entities.
$ownedEntitiesWithFk = array();
$ownedEntitiesWithoutFk = array();
$ownerEntitiesWithState = array();
$uncheckedEntities = array();
foreach ($entity->getRelationships() as $relationship) {
$otherEntity = $relationship->getOppositeEntity($entity);
$otherEntityName = $otherEntity->getName();
// If this is a link relationship...
if (!$relationship->getFkEntity()->isObjectEntity()) {
// ...then delete any link object referring to the current (to be deleted) object.
$propertyValues = array();
$propertyValues[$relationship->getFkColumnName($entity)] = $id;
$this->terminateLinks($schema, $relationship->getFkEntity(), $propertyValues, $audit);
} else {
if ($relationship->getOwnerEntity() == $entity) {
if ($relationship->getFkEntity() == $otherEntity) {
$ownedEntitiesWithFk[$otherEntityName] = $otherEntity;
} else {
$ownedEntitiesWithoutFk[$otherEntityName] = $otherEntity;
}
} else {
if ($otherEntity->getStateIdColumnName() != NULL) {
$ownerEntitiesWithState[$otherEntityName] = $otherEntity;
} else {
$uncheckedEntities[$otherEntityName] = $otherEntity;
}
}
}
}
// Now fetch the ObjectRefs.
$objectRef = new ObjectRef($entity, $id);
$scope = Scope::parseValue(Scope::VALUE_C_REF . Scope::VALUE_A_REF);
$ownedObjectRefs = $objectRef->fetchAllRelatedObjectRefs($schema->getMySQLi(), array_merge($ownedEntitiesWithFk, $ownedEntitiesWithoutFk), $this->defaultQueryContext, $scope);
// If the object supports the 'terminated' state...
if ($entity->getStateIdColumnName() != NULL) {
// ...then terminate it.
$numTerminated += $this->terminateObject($schema, $entity, $id, $audit);
if ($numTerminated > 0) {
// Traverse the object tree and recursively delete children.
foreach ($ownedObjectRefs as $ownedObjectRef) {
$numTerminated += $this->deleteObjectTree($schema, $ownedObjectRef->getEntity(), $ownedObjectRef->getId(), $audit);
}
}
} else {
// The object does not support the 'terminated' state, so it must be deleted permanently.
// Check if any 'owner-objects-with-state' refer to the given object, either now or in the past.
if (count($ownerEntitiesWithState) > 0) {
$queryContext = new QueryContext(array(RestUrlParams::AT => RestUrlParams::ALL_TIMES), NULL);
$scope = Scope::parseValue(Scope::VALUE_O_REF);
$ownerObjectRefs = $objectRef->fetchAllRelatedObjectRefs($schema->getMySQLi(), $ownerEntitiesWithState, $queryContext, $scope);
if (count($ownerObjectRefs) > 0) {
// Some terminated owner objects are still referring to this object, so we cannot delete it.
return $numTerminated;
}
}
// Split the set of $ownedObjectRefs in two: one set that keeps a foreign key and another that doesn't.
$ownedObjectRefsWithFk = array();
$ownedObjectRefsWithoutFk = array();
foreach ($ownedObjectRefs as $ownedObjectRef) {
if (array_search($ownedObjectRef->getEntity(), $ownedEntitiesWithFk) !== FALSE) {
$ownedObjectRefsWithFk[] = $ownedObjectRef;
} else {
$ownedObjectRefsWithoutFk[] = $ownedObjectRef;
}
}
// First get rid of all owned objects that keep a foreign key to self...
$numTerminated += $this->deleteAndPurgeObjectTrees($schema, $entity, $id, $ownedObjectRefsWithFk, $audit);
// ...then delete the object itself.
// If deleting an _account, then make sure that any reference to it is 'patched'...
$this->patchAccountRefsIfNecessary($schema, $entity, $id, $audit);
// ...and then delete the object itself.
$queryString = "DELETE d FROM " . $entity->getName() . " d" . " WHERE d." . $entity->getObjectIdColumnName() . " = {$id}";
$mySQLi = $schema->getMySQLi();
$queryResult = $mySQLi->query($queryString);
if (!$queryResult) {
throw new Exception("Error deleting objects of entity '" . $entity->getName() . "' - {$mySQLi->error}\n<!--\n{$queryString}\n-->");
}
$numTerminated += $mySQLi->affected_rows;
// Finally, after all foreign keys referring to them have been deleted, delete the remaining owned objects.
$numTerminated += $this->deleteAndPurgeObjectTrees($schema, $entity, $id, $ownedObjectRefsWithoutFk, $audit);
}
return $numTerminated;
}
private function getOwnedObjectRefs(Schema $schema, ObjectEntity $entity, $id, $isPublished)
{
// Find any related objects that are (still) published.
// First create a set of entities that are 'owned' by the given one...
$ownedEntities = array();
foreach ($entity->getRelationships() as $relationship) {
if ($relationship->getOwnerEntity() == $entity) {
$oppositeEntity = $relationship->getOppositeEntity($entity);
if ($oppositeEntity->isObjectEntity()) {
$ownedEntities[] = $oppositeEntity;
}
}
}
// ...and then fetch the published ObjectRefs.
if (count($ownedEntities) == 0) {
return NULL;
}
$objectRef = new ObjectRef($entity, $id);
$params = array(RestUrlParams::PUBLISHED => $isPublished ? 'true' : 'false');
$queryContext = new QueryContext($params, NULL);
$scope = Scope::parseValue(Scope::VALUE_C_REF . Scope::VALUE_A_REF . Scope::VALUE_O_REF);
return $objectRef->fetchAllRelatedObjectRefs($schema->getMySQLi(), $ownedEntities, $queryContext, $scope);
}
