def _init_index(self):
if not INTERVAL_INDEX_GROUP in self.hdf_group:
h5file = self._get_hdf_file()
h5file.createGroup(self.hdf_group, INTERVAL_INDEX_GROUP)
parentgroup = self.hdf_group._f_getChild(INTERVAL_INDEX_GROUP)
self.indexes = {}
for rname in self.get_rnames():
idx = self._Index()
# load index if it exists
if rname in parentgroup:
tree = IntervalTree.fromhdf(parentgroup._f_getChild(rname))
idx.tree = tree
self.indexes[rname] = idx
