| /* |
| * Copyright (C) 2018 The Android Open Source Project |
| * |
| * 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. |
| */ |
| |
| #ifndef SRC_TRACE_PROCESSOR_ROW_ITERATORS_H_ |
| #define SRC_TRACE_PROCESSOR_ROW_ITERATORS_H_ |
| |
| #include <stdint.h> |
| #include <vector> |
| |
| namespace perfetto { |
| namespace trace_processor { |
| |
| // Implements a strategy of yielding indices into a storage system to fulfil |
| // a query. |
| class RowIterator { |
| public: |
| virtual ~RowIterator(); |
| |
| virtual void NextRow() = 0; |
| virtual uint32_t Row() = 0; |
| virtual bool IsEnd() = 0; |
| }; |
| |
| // A row iterator which iterates through a range of indicies in either ascending |
| // or descending order and optionally skips rows depending on a bitvector. |
| class RangeRowIterator : public RowIterator { |
| public: |
| RangeRowIterator(uint32_t start_row, uint32_t end_row, bool desc); |
| RangeRowIterator(uint32_t start_row, bool desc, std::vector<bool> row_filter); |
| |
| void NextRow() override; |
| bool IsEnd() override; |
| uint32_t Row() override; |
| |
| uint32_t RowCount() const; |
| |
| private: |
| uint32_t start_row_ = 0; |
| uint32_t end_row_ = 0; |
| bool desc_ = false; |
| std::vector<bool> row_filter_; |
| |
| // In non-desc mode, this is an offset from start_row_ while in desc mode, |
| // this is an offset from end_row_. |
| uint32_t offset_ = 0; |
| }; |
| |
| // A row iterator which yields row indices from a provided vector. |
| class VectorRowIterator : public RowIterator { |
| public: |
| explicit VectorRowIterator(std::vector<uint32_t> row_indices); |
| ~VectorRowIterator() override; |
| |
| void NextRow() override; |
| bool IsEnd() override; |
| uint32_t Row() override; |
| |
| private: |
| std::vector<uint32_t> row_indices_; |
| uint32_t offset_ = 0; |
| }; |
| |
| } // namespace trace_processor |
| } // namespace perfetto |
| |
| #endif // SRC_TRACE_PROCESSOR_ROW_ITERATORS_H_ |