1 /* 2 * Copyright (C) 2018 The Android Open Source Project 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 17 #ifndef SRC_TRACE_PROCESSOR_STRING_TABLE_H_ 18 #define SRC_TRACE_PROCESSOR_STRING_TABLE_H_ 19 20 #include <limits> 21 #include <memory> 22 23 #include "src/trace_processor/table.h" 24 25 namespace perfetto { 26 namespace trace_processor { 27 28 class QueryConstraints; 29 class TraceStorage; 30 31 // A virtual table that allows to list and query all the strings in the db. 32 class StringTable : public Table { 33 public: 34 enum Column { 35 kStringId = 0, 36 kString = 1, 37 }; 38 // Implementation of the SQLite cursor interface. 39 class Cursor : public Table::Cursor { 40 public: 41 Cursor(StringTable*); 42 ~Cursor() override; 43 44 // Implementation of Table::Cursor. 45 int Filter(const QueryConstraints&, sqlite3_value**) override; 46 int Next() override; 47 int Eof() override; 48 int Column(sqlite3_context*, int N) override; 49 50 private: 51 Cursor(Cursor&) = delete; 52 Cursor& operator=(const Cursor&) = delete; 53 54 Cursor(Cursor&&) noexcept = default; 55 Cursor& operator=(Cursor&&) = default; 56 57 size_t row_ = 0; 58 size_t num_rows_ = 0; 59 60 const TraceStorage* storage_ = nullptr; 61 StringTable* table_ = nullptr; 62 }; 63 64 StringTable(sqlite3*, const TraceStorage* storage); 65 66 static void RegisterTable(sqlite3* db, const TraceStorage* storage); 67 68 // Table implementation. 69 base::Optional<Table::Schema> Init(int, const char* const*) override; 70 std::unique_ptr<Table::Cursor> CreateCursor() override; 71 int BestIndex(const QueryConstraints&, BestIndexInfo*) override; 72 73 private: 74 const TraceStorage* const storage_; 75 }; 76 77 } // namespace trace_processor 78 } // namespace perfetto 79 80 #endif // SRC_TRACE_PROCESSOR_STRING_TABLE_H_ 81