case IBTreeConst.ID2NODE_BTREE:
return new org.chaidb.db.index.btree.Id2nodeBTree();
case IBTreeConst.SUPER_BTREE:
return new org.chaidb.db.index.btree.SuperBTree();
case IBTreeConst.HYPER_BTREE:
return new HyperBTree();
case IBTreeConst.PATH_BTREE:
return new PathBTree();
case IBTreeConst.BTREE:
return new BTree();
default: