1/**
2 * Copyright 2021 Alibaba, Inc. and its affiliates. All Rights Reserved.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 *
16 * \author guonix
17 * \date Nov 2020
18 * \brief
19 */
20
21#pragma once
22
23#include "meta/meta_service.h"
24
25namespace proxima {
26namespace be {
27namespace query {
28
29//! Predefine class
30class MetaWrapper;
31
32//! Alias for ColumnNameList
33using ColumnNameList = std::vector<std::string>;
34using MetaWrapperPtr = std::shared_ptr<MetaWrapper>;
35
36
37/*!
38 * MetaWrapper
39 */
40class MetaWrapper {
41 public:
42 //! Constructor
43 explicit MetaWrapper(meta::MetaServicePtr meta_service);
44
45 public:
46 //! validate collection and columns
47 int validate(const std::string &collection,
48 const ColumnNameList &columns) const;
49
50 //! validate collection
51 int validate_collection(const std::string &collection) const;
52
53 //! validate collection and column
54 int validate_column(const std::string &collection,
55 const std::string &column) const;
56
57 //! list all the columns
58 int list_columns(const std::string &collection, uint64_t revision,
59 ColumnNameList *columns) const;
60
61 //! get data type by column
62 DataTypes get_data_type(const std::string &collection,
63 const std::string &column);
64
65 private:
66 //! Meta service handler
67 meta::MetaServicePtr meta_service_{nullptr};
68};
69
70
71} // namespace query
72} // namespace be
73} // namespace proxima
74