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/*
* Copyright (C) 2022 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_DB_COLUMN_STORAGE_H_
#define SRC_TRACE_PROCESSOR_DB_COLUMN_STORAGE_H_
#include "src/trace_processor/containers/nullable_vector.h"
namespace perfetto {
namespace trace_processor {
// Base class for allowing type erasure when defining plug-in implementations
// of backing storage for columns.
class ColumnStorageBase {
public:
ColumnStorageBase() = default;
virtual ~ColumnStorageBase();
ColumnStorageBase(const ColumnStorageBase&) = delete;
ColumnStorageBase& operator=(const ColumnStorageBase&) = delete;
ColumnStorageBase(ColumnStorageBase&&) = default;
ColumnStorageBase& operator=(ColumnStorageBase&&) noexcept = default;
};
// Class used for implementing storage for non-null columns.
template <typename T>
class ColumnStorage : public ColumnStorageBase {
public:
ColumnStorage() = default;
explicit ColumnStorage(const ColumnStorage&) = delete;
ColumnStorage& operator=(const ColumnStorage&) = delete;
ColumnStorage(ColumnStorage&&) = default;
ColumnStorage& operator=(ColumnStorage&&) noexcept = default;
T Get(uint32_t idx) const { return vector_[idx]; }
void Append(T val) { vector_.emplace_back(val); }
void Set(uint32_t idx, T val) { vector_[idx] = val; }
uint32_t size() const { return static_cast<uint32_t>(vector_.size()); }
void ShrinkToFit() { vector_.shrink_to_fit(); }
template <bool IsDense>
static ColumnStorage<T> Create() {
static_assert(!IsDense, "Invalid for non-null storage to be dense.");
return ColumnStorage<T>();
}
private:
std::vector<T> vector_;
};
// Class used for implementing storage for nullable columns.
template <typename T>
class ColumnStorage<std::optional<T>> : public ColumnStorageBase {
public:
ColumnStorage() = default;
explicit ColumnStorage(const ColumnStorage&) = delete;
ColumnStorage& operator=(const ColumnStorage&) = delete;
ColumnStorage(ColumnStorage&&) = default;
ColumnStorage& operator=(ColumnStorage&&) noexcept = default;
std::optional<T> Get(uint32_t idx) const { return nv_.Get(idx); }
void Append(T val) { nv_.Append(val); }
void Append(std::optional<T> val) { nv_.Append(std::move(val)); }
void Set(uint32_t idx, T val) { nv_.Set(idx, val); }
uint32_t size() const { return nv_.size(); }
bool IsDense() const { return nv_.IsDense(); }
void ShrinkToFit() { nv_.ShrinkToFit(); }
template <bool IsDense>
static ColumnStorage<std::optional<T>> Create() {
return IsDense
? ColumnStorage<std::optional<T>>(NullableVector<T>::Dense())
: ColumnStorage<std::optional<T>>(NullableVector<T>::Sparse());
}
private:
explicit ColumnStorage(NullableVector<T> nv) : nv_(std::move(nv)) {}
NullableVector<T> nv_;
};
} // namespace trace_processor
} // namespace perfetto
#endif // SRC_TRACE_PROCESSOR_DB_COLUMN_STORAGE_H_
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