private function removePreviousCrossReferences(Project $project, $revision, $old_commit_message)
{
$GLOBALS['group_id'] = $project->getID();
$references = $this->reference_manager->extractReferences($old_commit_message, $project->getID());
foreach ($references as $reference_instance) {
/* @var $reference Reference */
$reference = $reference_instance->getReference();
if ($reference) {
$cross_reference = new CrossReference($revision, $project->getID(), ReferenceManager::REFERENCE_NATURE_SVNREVISION, '', $reference_instance->getValue(), $reference->getGroupId(), $reference->getNature(), '', '');
$this->reference_manager->removeCrossReference($cross_reference);
}
}
}