1 /* 2 * Copyright (c) 2021 Huawei Device Co., Ltd. 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 22 #include <sqlite3.h> 23 24 namespace SysTuning { 25 namespace TraceStreamer { 26 class FilterConstraints { 27 public: 28 struct Constraint { 29 int idxInaConstraint; // index in sqlite3_index_info.aConstraint[] 30 int col; // Column this constraint refers to 31 unsigned char op; // SQLite op for the constraint 32 bool isSupport = false; 33 }; 34 using OrderBy = sqlite3_index_info::sqlite3_index_orderby; 35 FilterConstraints()36 FilterConstraints() {} ~FilterConstraints()37 ~FilterConstraints() {} 38 void AddConstraint(int idx, int col, unsigned char op, bool isSupport = false); 39 void UpdateConstraint(int idx, bool isSupport); 40 void AddOrderBy(int col, unsigned char desc); 41 void Clear(); 42 GetOrderBys()43 const std::vector<OrderBy>& GetOrderBys() const 44 { 45 return orderBys_; 46 } 47 GetConstraints()48 const std::vector<Constraint>& GetConstraints() const 49 { 50 return constraints_; 51 } 52 53 // idxStr format: C<N> col1 op1 ... colN opN O<M> col1 desc1 ... colM descM 54 // like as "C2 0 2 1 4 O1 0 1" 55 void ToString(std::string& idxStr) const; 56 void FromString(const std::string& idxStr); 57 58 private: 59 std::vector<Constraint> constraints_; 60 std::vector<OrderBy> orderBys_; 61 const std::size_t idxStrSize_ = 512; 62 }; 63 } // namespace TraceStreamer 64 } // namespace SysTuning 65 66 #endif // TABLE_FILTER_CONSTRAINTS_H 67