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/*
* 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_