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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 "iattributesavetarget.h"
#include <vespa/searchlib/util/bufferwriter.h>
#include <vespa/vespalib/util/arrayref.h>
namespace search::multivalueattributesaver {
/*
* Class to write to count files for multivalue attributes (.idx suffix).
*/
class CountWriter
{
std::unique_ptr<search::BufferWriter> _countWriter;
uint64_t _cnt;
public:
CountWriter(IAttributeSaveTarget &saveTarget);
~CountWriter();
void writeCount(uint32_t count);
};
/*
* Class to write to weight files (or not) for multivalue attributes.
*/
template <bool hasWeight>
class WeightWriter;
/*
* Class to write to weight files for multivalue attributes (.weight suffix).
*/
template <>
class WeightWriter<true>
{
std::unique_ptr<search::BufferWriter> _weightWriter;
public:
WeightWriter(IAttributeSaveTarget &saveTarget)
: _weightWriter(saveTarget.weightWriter().allocBufferWriter())
{}
~WeightWriter() {
_weightWriter->flush();
}
template <typename MultiValueT>
void
writeWeights(vespalib::ConstArrayRef<MultiValueT> values) {
for (const MultiValueT &valueRef : values) {
int32_t weight = valueRef.weight();
_weightWriter->write(&weight, sizeof(int32_t));
}
}
};
/*
* Class to not write to weight files for multivalue attributes.
*/
template <>
class WeightWriter<false>
{
public:
WeightWriter(IAttributeSaveTarget &) {}
~WeightWriter() {}
template <typename MultiValueT>
void writeWeights(vespalib::ConstArrayRef<MultiValueT>) {}
};
}
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