1 /* 2 * Copyright (c) Huawei Technologies Co., Ltd. 2023. All rights reserved. 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 16 #ifndef TABLE_FILTER_CONSTRAINTS_H 17 #define TABLE_FILTER_CONSTRAINTS_H 18 19 #include <string> 20 #include <vector> 21 #include "sqlite3.h" 22 23 namespace SysTuning { 24 namespace TraceStreamer { 25 class FilterConstraints { 26 public: 27 struct Constraint { 28 int32_t idxInaConstraint; // index in sqlite3_index_info.aConstraint[] 29 int32_t col; // Column this constraint refers to 30 unsigned char op; // SQLite op for the constraint 31 bool isSupport = false; 32 }; 33 using OrderBy = sqlite3_index_info::sqlite3_index_orderby; 34 FilterConstraints()35 FilterConstraints() {} ~FilterConstraints()36 ~FilterConstraints() {} 37 void AddConstraint(int32_t idx, int32_t col, unsigned char op, bool isSupport = false); 38 void UpdateConstraint(int32_t idx, bool isSupport); 39 void AddOrderBy(int32_t col, unsigned char desc); 40 void Clear(); 41 GetOrderBys()42 const std::vector<OrderBy> &GetOrderBys() const 43 { 44 return orderBys_; 45 } 46 GetConstraints()47 const std::vector<Constraint> &GetConstraints() const 48 { 49 return constraints_; 50 } 51 52 // idxStr format: C<N> col1 op1 ... colN opN O<M> col1 desc1 ... colM descM 53 // like as "C2 0 2 1 4 O1 0 1" 54 void ToString(std::string &idxStr) const; 55 void FromString(const std::string &idxStr); 56 57 private: 58 void GetColAndOp(const char **p, char **pNext, int32_t &col, unsigned char &op); 59 60 private: 61 std::vector<Constraint> constraints_; 62 std::vector<OrderBy> orderBys_; 63 const std::size_t idxStrSize_ = 512; 64 }; 65 } // namespace TraceStreamer 66 } // namespace SysTuning 67 68 #endif // TABLE_FILTER_CONSTRAINTS_H 69