mirror of https://github.com/facebook/rocksdb.git
70 lines
2.3 KiB
C++
70 lines
2.3 KiB
C++
// Copyright (c) Meta Platforms, Inc. and affiliates.
|
|
//
|
|
// This source code is licensed under both the GPLv2 (found in the
|
|
// COPYING file in the root directory) and Apache 2.0 License
|
|
// (found in the LICENSE.Apache file in the root directory).
|
|
|
|
#pragma once
|
|
|
|
#include "rocksdb/iterator.h"
|
|
#include "table/internal_iterator.h"
|
|
|
|
namespace ROCKSDB_NAMESPACE {
|
|
// An iterator wrapper class used to wrap an `InternalIterator` created by API
|
|
// `TableReader::NewIterator`. The `InternalIterator` should be allocated with
|
|
// the default allocator, not on an arena.
|
|
// NOTE: Callers should ensure the wrapped `InternalIterator*` is a valid
|
|
// pointer before constructing a `TableIterator` with it.
|
|
class TableIterator : public Iterator {
|
|
void reset(InternalIterator* iter) noexcept {
|
|
if (iter_ != nullptr) {
|
|
delete iter_;
|
|
}
|
|
iter_ = iter;
|
|
}
|
|
|
|
public:
|
|
explicit TableIterator(InternalIterator* iter) : iter_(iter) {}
|
|
|
|
TableIterator(const TableIterator&) = delete;
|
|
TableIterator& operator=(const TableIterator&) = delete;
|
|
|
|
TableIterator(TableIterator&& o) noexcept {
|
|
iter_ = o.iter_;
|
|
o.iter_ = nullptr;
|
|
}
|
|
|
|
TableIterator& operator=(TableIterator&& o) noexcept {
|
|
reset(o.iter_);
|
|
o.iter_ = nullptr;
|
|
return *this;
|
|
}
|
|
|
|
InternalIterator* operator->() { return iter_; }
|
|
InternalIterator* get() { return iter_; }
|
|
|
|
~TableIterator() override { reset(nullptr); }
|
|
|
|
bool Valid() const override { return iter_->Valid(); }
|
|
void SeekToFirst() override { return iter_->SeekToFirst(); }
|
|
void SeekToLast() override { return iter_->SeekToLast(); }
|
|
void Seek(const Slice& target) override { return iter_->Seek(target); }
|
|
void SeekForPrev(const Slice& target) override {
|
|
return iter_->SeekForPrev(target);
|
|
}
|
|
void Next() override { return iter_->Next(); }
|
|
void Prev() override { return iter_->Prev(); }
|
|
Slice key() const override { return iter_->key(); }
|
|
Slice value() const override { return iter_->value(); }
|
|
Status status() const override { return iter_->status(); }
|
|
Status GetProperty(std::string /*prop_name*/,
|
|
std::string* /*prop*/) override {
|
|
assert(false);
|
|
return Status::NotSupported("TableIterator does not support GetProperty.");
|
|
}
|
|
|
|
private:
|
|
InternalIterator* iter_;
|
|
};
|
|
} // namespace ROCKSDB_NAMESPACE
|