private function recursivelyFindChildrenBelongingToTracker(Tracker_Artifact $source_artifact, Tracker $expected_tracker, User $user, array $hierarchy)
{
$artifacts = array();
$children = $source_artifact->getLinkedArtifactsOfHierarchy($user);
if (isset($hierarchy[$source_artifact->getId()])) {
array_walk($children, array($this, 'keepOnlyArtifactsBelongingToParentTracker'), $hierarchy[$source_artifact->getId()]);
array_filter($children);
}
if ($children) {
foreach ($children as $child) {
if ($child->getTracker() == $expected_tracker) {
$artifacts[] = $child;
} else {
$artifacts = array_merge($artifacts, $this->recursivelyFindChildrenBelongingToTracker($child, $expected_tracker, $user, $hierarchy));
}
}
}
return $artifacts;
}
