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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 <vespa/vespalib/datastore/atomic_entry_ref.h>
#include <vespa/vespalib/datastore/array_store.h>
#include <vespa/vespalib/datastore/array_store_dynamic_type_mapper.h>
#include <vespa/vespalib/datastore/dynamic_array_buffer_type.h>
#include <vespa/vespalib/util/address_space.h>
namespace search::attribute {
/**
* Class for mapping from document id to an array of values as reader.
*/
template <typename ElemT, typename RefT = vespalib::datastore::EntryRefT<19> >
class MultiValueMappingReadView
{
using AtomicEntryRef = vespalib::datastore::AtomicEntryRef;
using Indices = vespalib::ConstArrayRef<AtomicEntryRef>;
using ArrayStoreTypeMapper = vespalib::datastore::ArrayStoreDynamicTypeMapper<ElemT>;
using ArrayStore = vespalib::datastore::ArrayStore<ElemT, RefT, ArrayStoreTypeMapper>;
Indices _indices;
const ArrayStore* _store;
public:
constexpr MultiValueMappingReadView()
: _indices(),
_store(nullptr)
{
}
MultiValueMappingReadView(Indices indices, const ArrayStore* store)
: _indices(indices),
_store(store)
{
}
vespalib::ConstArrayRef<ElemT> get(uint32_t doc_id) const { return _store->get(_indices[doc_id].load_acquire()); }
bool valid() const noexcept { return _store != nullptr; }
uint32_t get_committed_docid_limit() const noexcept { return _indices.size(); }
};
}
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