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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include "i_unique_store_dictionary.h"
#include "i_unique_store_dictionary_read_snapshot.h"
#include <vespa/vespalib/stllike/allocator.h>
#include <cassert>
namespace vespalib::datastore {
class DataStoreBase;
/**
* Enumerator for related UniqueStore class.
*
* Contains utility methods for traversing all unique values (as
* EntryRef value) and mapping from EntryRef value to enum value.
*/
template <typename RefT>
class UniqueStoreEnumerator {
public:
using RefType = RefT;
private:
using UInt32Vector = std::vector<uint32_t, vespalib::allocator_large<uint32_t>>;
using EnumValues = std::vector<UInt32Vector>;
std::unique_ptr<IUniqueStoreDictionaryReadSnapshot> _dict_snapshot;
const DataStoreBase &_store;
EnumValues _enumValues;
uint32_t _next_enum_val;
void allocate_enum_values(DataStoreBase &store);
public:
UniqueStoreEnumerator(const IUniqueStoreDictionary &dict, DataStoreBase &store, bool sort_unique_values);
~UniqueStoreEnumerator();
void enumerateValue(EntryRef ref);
void enumerateValues();
void clear();
template <typename Function>
void
foreach_key(Function &&func) const {
_dict_snapshot->foreach_key(func);
}
uint32_t mapEntryRefToEnumValue(EntryRef ref) const {
if (ref.valid()) {
RefType iRef(ref);
assert(iRef.offset() < _enumValues[iRef.bufferId()].size());
uint32_t enumValue = _enumValues[iRef.bufferId()][iRef.offset()];
assert(enumValue != 0);
return enumValue;
} else {
return 0u;
}
}
uint32_t map_entry_ref_to_enum_value_or_zero(EntryRef ref) const {
if (ref.valid()) {
RefType iRef(ref);
if (iRef.offset() < _enumValues[iRef.bufferId()].size()) {
return _enumValues[iRef.bufferId()][iRef.offset()];
} else {
return 0u;
}
} else {
return 0u;
}
}
};
}
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