}
public OlatRootFolderImpl getSharedFolder(OLATResourceable res) {
OlatRootFolderImpl rootFolderImpl = (OlatRootFolderImpl)FileResourceManager.getInstance().getFileResourceRootImpl(res).resolve(SharedFolderManager.FOLDER_NAME);
if (rootFolderImpl == null) return null;
rootFolderImpl.setLocalSecurityCallback(new SharedFolderSecurityCallback(rootFolderImpl.getRelPath()));
return rootFolderImpl;
}