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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 "unique_store_allocator.h"
#include <vespa/vespalib/stllike/allocator.h>
namespace vespalib::datastore {
class IUniqueStoreDictionary;
/**
* Builder for related UniqueStore class.
*
* Contains utility method for adding new unique values and mapping
* from enum value to EntryRef value. New unique values must be added
* in sorted order.
*/
template <typename Allocator>
class UniqueStoreBuilder {
using EntryType = typename Allocator::EntryType;
Allocator& _allocator;
IUniqueStoreDictionary& _dict;
std::vector<EntryRef, allocator_large<EntryRef>> _refs;
std::vector<uint32_t, allocator_large<uint32_t>> _refCounts;
public:
UniqueStoreBuilder(Allocator& allocator, IUniqueStoreDictionary& dict, uint32_t uniqueValuesHint);
~UniqueStoreBuilder();
void setupRefCounts();
void makeDictionary();
void add(const EntryType& value) {
EntryRef newRef = _allocator.allocate(value);
_refs.push_back(newRef);
}
EntryRef mapEnumValueToEntryRef(uint32_t enumValue) {
assert(enumValue < _refs.size());
assert(_refCounts[enumValue] < std::numeric_limits<uint32_t>::max());
++_refCounts[enumValue];
return _refs[enumValue];
}
};
}
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