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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 "hnsw_index_type.h"
#include "hnsw_node.h"
#include "hnsw_simple_node.h"
namespace search::tensor {
/*
* Meta data for node during save of hnsw graph.
*/
template <HnswIndexType type>
class HnswIndexSaverMetaDataNode;
/*
* Meta data for node during save of hnsw graph with one node per document and
* identity mapping between nodeid and docid.
*/
template <>
class HnswIndexSaverMetaDataNode<HnswIndexType::SINGLE>
{
uint32_t _refs_offset;
public:
HnswIndexSaverMetaDataNode(uint32_t refs_offset) noexcept
: _refs_offset(refs_offset)
{
}
HnswIndexSaverMetaDataNode(uint32_t refs_offset, const HnswSimpleNode&) noexcept
: _refs_offset(refs_offset)
{
}
uint32_t get_refs_offset() const noexcept { return _refs_offset; }
static constexpr bool identity_mapping = true;
};
/*
* Meta data for node during save of hnsw graph with multiple nodes per document and
* managed mapping between nodeid and docid.
*/
template <>
class HnswIndexSaverMetaDataNode<HnswIndexType::MULTI>
{
uint32_t _refs_offset;
uint32_t _docid;
uint32_t _subspace;
public:
HnswIndexSaverMetaDataNode(uint32_t refs_offset) noexcept
: _refs_offset(refs_offset),
_docid(0),
_subspace(0)
{
}
HnswIndexSaverMetaDataNode(uint32_t refs_offset, const HnswNode& node) noexcept
: _refs_offset(refs_offset),
_docid(node.acquire_docid()),
_subspace(node.acquire_subspace())
{
}
uint32_t get_refs_offset() const noexcept { return _refs_offset; }
uint32_t get_docid() const noexcept { return _docid; }
uint32_t get_subspace() const noexcept { return _subspace; }
static constexpr bool identity_mapping = false;
};
}
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