# -*- coding: utf-8 -*-
#
# Copyright 2017 Ricequant, Inc
#
# 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.

import bcolz


class SimpleFactorStore(object):
    def __init__(self, f):
        table = bcolz.open(f, 'r')
        self._index = table.attrs['line_map']
        self._table = table[:]

    def get_factors(self, order_book_id):
        try:
            s, e = self._index[order_book_id]
            return self._table[s:e]
        except KeyError:
            return None
