/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef SRC_TRACE_PROCESSOR_ROW_ITERATORS_H_
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#define SRC_TRACE_PROCESSOR_ROW_ITERATORS_H_
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#include <stdint.h>
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#include <vector>
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namespace perfetto {
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namespace trace_processor {
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// Implements a strategy of yielding indices into a storage system to fulfil
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// a query.
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class RowIterator {
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public:
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virtual ~RowIterator();
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virtual void NextRow() = 0;
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virtual uint32_t Row() = 0;
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virtual bool IsEnd() = 0;
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};
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// A row iterator which iterates through a range of indicies in either ascending
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// or descending order and optionally skips rows depending on a bitvector.
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class RangeRowIterator : public RowIterator {
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public:
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RangeRowIterator(uint32_t start_row, uint32_t end_row, bool desc);
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RangeRowIterator(uint32_t start_row, bool desc, std::vector<bool> row_filter);
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void NextRow() override;
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bool IsEnd() override;
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uint32_t Row() override;
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uint32_t RowCount() const;
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private:
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uint32_t start_row_ = 0;
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uint32_t end_row_ = 0;
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bool desc_ = false;
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std::vector<bool> row_filter_;
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// In non-desc mode, this is an offset from start_row_ while in desc mode,
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// this is an offset from end_row_.
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uint32_t offset_ = 0;
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};
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// A row iterator which yields row indices from a provided vector.
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class VectorRowIterator : public RowIterator {
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public:
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explicit VectorRowIterator(std::vector<uint32_t> row_indices);
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~VectorRowIterator() override;
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void NextRow() override;
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bool IsEnd() override;
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uint32_t Row() override;
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private:
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std::vector<uint32_t> row_indices_;
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uint32_t offset_ = 0;
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};
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} // namespace trace_processor
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} // namespace perfetto
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#endif // SRC_TRACE_PROCESSOR_ROW_ITERATORS_H_
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