# -*- coding: utf-8 -*-
#
# Copyright 2014, Qunar OPSDEV
#
#    Licensed under the Apache License, Version 2.0 (the "License");
#    you may not use this file except in compliance with the License.
#    You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS,
#    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#    See the License for the specific language governing permissions and
#    limitations under the License.
#
# Author: Jianing Yang <jianingy.yang@gmail.com>
#
# TODO(jianingy): Add LTree Validation([a-z0-9_.]) and Raise Exceptions

import sqlalchemy.types


class LTree(sqlalchemy.types.UserDefinedType):

    def get_col_spec(self):
        return 'LTREE'
