mirror of https://github.com/facebook/rocksdb.git
107 lines
3.3 KiB
C++
107 lines
3.3 KiB
C++
// Copyright (c) Meta Platforms, Inc. and affiliates.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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#pragma once
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#include "db/multi_cf_iterator_impl.h"
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#include "rocksdb/attribute_groups.h"
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namespace ROCKSDB_NAMESPACE {
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class AttributeGroupIteratorImpl : public AttributeGroupIterator {
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public:
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AttributeGroupIteratorImpl(
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const Comparator* comparator,
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const std::vector<ColumnFamilyHandle*>& column_families,
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const std::vector<Iterator*>& child_iterators)
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: impl_(comparator, column_families, child_iterators, ResetFunc(this),
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PopulateFunc(this)) {}
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~AttributeGroupIteratorImpl() override {}
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// No copy allowed
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AttributeGroupIteratorImpl(const AttributeGroupIteratorImpl&) = delete;
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AttributeGroupIteratorImpl& operator=(const AttributeGroupIteratorImpl&) =
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delete;
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bool Valid() const override { return impl_.Valid(); }
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void SeekToFirst() override { impl_.SeekToFirst(); }
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void SeekToLast() override { impl_.SeekToLast(); }
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void Seek(const Slice& target) override { impl_.Seek(target); }
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void SeekForPrev(const Slice& target) override { impl_.SeekForPrev(target); }
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void Next() override { impl_.Next(); }
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void Prev() override { impl_.Prev(); }
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Slice key() const override { return impl_.key(); }
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Status status() const override { return impl_.status(); }
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const IteratorAttributeGroups& attribute_groups() const override {
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assert(Valid());
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return attribute_groups_;
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}
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void Reset() { attribute_groups_.clear(); }
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private:
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class ResetFunc {
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public:
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explicit ResetFunc(AttributeGroupIteratorImpl* iter) : iter_(iter) {}
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void operator()() const {
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assert(iter_);
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iter_->Reset();
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}
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private:
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AttributeGroupIteratorImpl* iter_;
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};
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class PopulateFunc {
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public:
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explicit PopulateFunc(AttributeGroupIteratorImpl* iter) : iter_(iter) {}
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void operator()(const autovector<MultiCfIteratorInfo>& items) const {
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assert(iter_);
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iter_->AddToAttributeGroups(items);
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}
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private:
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AttributeGroupIteratorImpl* iter_;
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};
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MultiCfIteratorImpl<ResetFunc, PopulateFunc> impl_;
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IteratorAttributeGroups attribute_groups_;
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void AddToAttributeGroups(const autovector<MultiCfIteratorInfo>& items);
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};
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class EmptyAttributeGroupIterator : public AttributeGroupIterator {
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public:
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explicit EmptyAttributeGroupIterator(const Status& s) : status_(s) {}
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bool Valid() const override { return false; }
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void Seek(const Slice& /*target*/) override {}
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void SeekForPrev(const Slice& /*target*/) override {}
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void SeekToFirst() override {}
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void SeekToLast() override {}
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void Next() override { assert(false); }
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void Prev() override { assert(false); }
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Slice key() const override {
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assert(false);
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return Slice();
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}
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Status status() const override { return status_; }
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const IteratorAttributeGroups& attribute_groups() const override {
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return kNoIteratorAttributeGroups;
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}
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private:
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Status status_;
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};
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inline std::unique_ptr<AttributeGroupIterator> NewAttributeGroupErrorIterator(
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const Status& status) {
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return std::make_unique<EmptyAttributeGroupIterator>(status);
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}
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} // namespace ROCKSDB_NAMESPACE
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