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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 "simple_dfw.h"
#include <memory>
namespace search {
class MatchingElements;
class MatchingElementsFields;
}
namespace search::attribute { class IAttributeContext; }
namespace vespalib { class Stash; }
namespace search::docsummary {
class DocsumFieldWriterState;
class DynamicDocsumWriter;
/*
* This class reads values from multiple struct field attributes and
* inserts them as an array of struct or a map of struct.
*/
class AttributeCombinerDFW : public SimpleDFW
{
protected:
uint32_t _stateIndex;
const bool _filter_elements;
vespalib::string _fieldName;
std::shared_ptr<MatchingElementsFields> _matching_elems_fields;
AttributeCombinerDFW(const vespalib::string &fieldName, bool filter_elements,
std::shared_ptr<MatchingElementsFields> matching_elems_fields);
protected:
virtual DocsumFieldWriterState* allocFieldWriterState(search::attribute::IAttributeContext &context, vespalib::Stash& stash, const MatchingElements* matching_elements) const = 0;
public:
~AttributeCombinerDFW() override;
bool isGenerated() const override { return true; }
bool setFieldWriterStateIndex(uint32_t fieldWriterStateIndex) override;
static std::unique_ptr<DocsumFieldWriter> create(const vespalib::string &fieldName, search::attribute::IAttributeContext &attrCtx,
bool filter_elements, std::shared_ptr<MatchingElementsFields> matching_elems_fields);
void insertField(uint32_t docid, GetDocsumsState& state, vespalib::slime::Inserter &target) const override;
};
}
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