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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 "atomic_utils.h"
#include "readerbase.h"
#include <vespa/vespalib/util/arrayref.h>
#include <vespa/searchcommon/attribute/multi_value_traits.h>
namespace vespalib::datastore {
class AtomicEntryRef;
class EntryRef;
}
namespace vespalib { class GenerationHolder; }
namespace search { class AttributeVector; }
namespace search::attribute {
/**
* Helper functions used to open / load attribute vector data files from disk.
*/
class LoadUtils {
public:
using FileInterfaceUP = std::unique_ptr<FastOS_FileInterface>;
using LoadedBufferUP = std::unique_ptr<fileutil::LoadedBuffer>;
static FileInterfaceUP openFile(const AttributeVector& attr, const vespalib::string& suffix);
static FileInterfaceUP openDAT(const AttributeVector& attr);
static FileInterfaceUP openIDX(const AttributeVector& attr);
static FileInterfaceUP openWeight(const AttributeVector& attr);
static bool file_exists(const AttributeVector& attr, const vespalib::string& suffix);
static LoadedBufferUP loadFile(const AttributeVector& attr, const vespalib::string& suffix);
static LoadedBufferUP loadDAT(const AttributeVector& attr);
static LoadedBufferUP loadIDX(const AttributeVector& attr);
static LoadedBufferUP loadWeight(const AttributeVector& attr);
static LoadedBufferUP loadUDAT(const AttributeVector& attr);
};
/**
* Function for loading mapping from document id to array of enum indexes
* or values from enumerated attribute reader.
*/
template <class MvMapping, class Saver>
uint32_t
loadFromEnumeratedMultiValue(MvMapping &mapping,
ReaderBase &attrReader,
vespalib::ConstArrayRef<atomic_utils::NonAtomicValue_t<multivalue::ValueType_t<typename MvMapping::MultiValueType>>> enumValueToValueMap,
vespalib::ConstArrayRef<uint32_t> enum_value_remapping,
Saver saver) __attribute((noinline));
/**
* Function for loading mapping from document id to enum index or
* value from enumerated attribute reader.
*/
template <class Vector, class Saver>
void
loadFromEnumeratedSingleValue(Vector &vector,
vespalib::GenerationHolder &genHolder,
ReaderBase &attrReader,
vespalib::ConstArrayRef<atomic_utils::NonAtomicValue_t<typename Vector::ValueType>> enumValueToValueMap,
vespalib::ConstArrayRef<uint32_t> enum_value_remapping,
Saver saver) __attribute((noinline));
}
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