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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 "i_multi_value_read_view.h"
namespace vespalib { class Stash; }
namespace search::attribute {
/**
* Interface that provides read views for different multi-value attribute types.
*
* The type-safe down-cast functions only return a valid pointer when that particular type is supported.
* Otherwise a nullptr is returned.
* The returned read view is owned by the supplied stash.
*/
class IMultiValueAttribute {
public:
template<typename MultiValueType>
class MultiValueTag {};
template<typename T>
using ArrayTag = MultiValueTag<T>;
using ArrayEnumTag = ArrayTag<vespalib::datastore::AtomicEntryRef>;
template<typename T>
using WeightedSetTag = MultiValueTag<search::multivalue::WeightedValue<T>>;
using WeightedSetEnumTag = WeightedSetTag<vespalib::datastore::AtomicEntryRef>;
virtual ~IMultiValueAttribute() = default;
virtual const IArrayReadView<int8_t>* make_read_view(ArrayTag<int8_t>, vespalib::Stash&) const { return nullptr; }
virtual const IArrayReadView<int16_t>* make_read_view(ArrayTag<int16_t>, vespalib::Stash&) const { return nullptr; }
virtual const IArrayReadView<int32_t>* make_read_view(ArrayTag<int32_t>, vespalib::Stash&) const { return nullptr; }
virtual const IArrayReadView<int64_t>* make_read_view(ArrayTag<int64_t>, vespalib::Stash&) const { return nullptr; }
virtual const IArrayReadView<float>* make_read_view(ArrayTag<float>, vespalib::Stash&) const { return nullptr; }
virtual const IArrayReadView<double>* make_read_view(ArrayTag<double>, vespalib::Stash&) const { return nullptr; }
virtual const IArrayReadView<const char*>* make_read_view(ArrayTag<const char*>, vespalib::Stash&) const { return nullptr; }
virtual const IWeightedSetReadView<int8_t>* make_read_view(WeightedSetTag<int8_t>, vespalib::Stash&) const { return nullptr; }
virtual const IWeightedSetReadView<int16_t>* make_read_view(WeightedSetTag<int16_t>, vespalib::Stash&) const { return nullptr; }
virtual const IWeightedSetReadView<int32_t>* make_read_view(WeightedSetTag<int32_t>, vespalib::Stash&) const { return nullptr; }
virtual const IWeightedSetReadView<int64_t>* make_read_view(WeightedSetTag<int64_t>, vespalib::Stash&) const { return nullptr; }
virtual const IWeightedSetReadView<float>* make_read_view(WeightedSetTag<float>, vespalib::Stash&) const { return nullptr; }
virtual const IWeightedSetReadView<double>* make_read_view(WeightedSetTag<double>, vespalib::Stash&) const { return nullptr; }
virtual const IWeightedSetReadView<const char*>* make_read_view(WeightedSetTag<const char*>, vespalib::Stash&) const { return nullptr; }
virtual const IArrayEnumReadView* make_read_view(ArrayEnumTag, vespalib::Stash&) const { return nullptr; }
virtual const IWeightedSetEnumReadView* make_read_view(WeightedSetEnumTag, vespalib::Stash&) const { return nullptr; }
};
}
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