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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_enum_store.h"
#include <vespa/vespalib/datastore/unique_store_string_comparator.h>
#include <functional>
namespace search::attribute {
/**
* Less-than comparator used for comparing next candidate string
* (successor) from vespa::fuzzy::LevenshteinDfa with strings stored
* in an enum store as part of a dictionary iterator seek, skipping
* entries that don't match the fuzzy term.
*
* The code points from the candidate string are not folded during
* the comparison.
*/
class DfaStringComparator : public vespalib::datastore::UniqueStoreStringComparator<IEnumStore::InternalIndex>
{
public:
using ParentType = vespalib::datastore::UniqueStoreStringComparator<IEnumStore::InternalIndex>;
using DataStoreType = ParentType::DataStoreType;
private:
using ParentType::get;
std::reference_wrapper<const std::vector<uint32_t>> _candidate;
public:
DfaStringComparator(const DataStoreType& data_store, const std::vector<uint32_t>& candidate);
bool less(const vespalib::datastore::EntryRef lhs, const vespalib::datastore::EntryRef rhs) const override;
};
}
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