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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include "i_direct_posting_store.h"
#include <vespa/vespalib/datastore/entryref.h>
#include <vector>
namespace search { class IEnumStoreDictionary; }
namespace search::attribute {
/**
* Base adapter class used to implement a specific IDirectPostingStore interface for
* an attribute vector with underlying posting lists (fast-search).
*/
template <typename ParentType, typename PostingStoreType, typename EnumStoreType>
class DirectPostingStoreAdapter : public ParentType {
protected:
const PostingStoreType& _posting_store;
const EnumStoreType& _enum_store;
const IEnumStoreDictionary& _dict;
bool _attr_is_filter;
public:
using IteratorType = typename ParentType::IteratorType;
DirectPostingStoreAdapter(const PostingStoreType& posting_store,
const EnumStoreType& enum_store,
bool attr_is_filter);
vespalib::datastore::EntryRef get_dictionary_snapshot() const override;
bool has_btree_iterator(vespalib::datastore::EntryRef posting_idx) const noexcept override;
std::unique_ptr<queryeval::SearchIterator>
make_bitvector_iterator(vespalib::datastore::EntryRef posting_idx, uint32_t doc_id_limit,
fef::TermFieldMatchData& match_data, bool strict) const override;
bool has_bitvector(vespalib::datastore::EntryRef posting_idx) const noexcept override;
bool has_always_btree_iterator() const noexcept override { return !_attr_is_filter; }
void create(vespalib::datastore::EntryRef idx, std::vector<IteratorType>& dst) const override;
IteratorType create(vespalib::datastore::EntryRef idx) const override;
};
}
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