if (_tree.getVolume().isTemporary()) {
_tree = _tree.getVolume().getTree(_tree.getName(), true);
_treeHolder = new ReentrantResourceHolder(_tree);
_cachedTreeGeneration = -1;
} else {
throw new TreeNotFoundException();
}
}
if (_cachedTreeGeneration != _tree.getGeneration()) {
_cachedTreeGeneration = _tree.getGeneration();
_cacheDepth = _tree.getDepth();