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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 "elementiterator.h"
#include <vespa/searchlib/fef/matchdata.h>
#include <vespa/searchlib/fef/termfieldmatchdataarray.h>
#include <vespa/searchlib/fef/termfieldmatchdata.h>
#include <vespa/searchlib/common/matching_elements.h>
#include <memory>
#include <vector>
namespace search::queryeval {
/**
* Search iterator for a collection of terms that need to match within
* the same element (array index).
*/
class SameElementSearch : public SearchIterator
{
private:
using It = fef::TermFieldMatchData::PositionsIterator;
fef::TermFieldMatchData &_tfmd;
fef::MatchData::UP _md;
std::vector<ElementIterator::UP> _children;
std::vector<uint32_t> _matchingElements;
bool _strict;
void fetch_matching_elements(uint32_t docid, std::vector<uint32_t> &dst);
bool check_docid_match(uint32_t docid);
bool check_element_match(uint32_t docid);
public:
SameElementSearch(fef::TermFieldMatchData &tfmd,
fef::MatchData::UP md,
std::vector<ElementIterator::UP> children,
bool strict);
void initRange(uint32_t begin_id, uint32_t end_id) override;
void doSeek(uint32_t docid) override;
void doUnpack(uint32_t docid) override;
void visitMembers(vespalib::ObjectVisitor &visitor) const override;
const std::vector<ElementIterator::UP> &children() const { return _children; }
// used during docsum fetching to identify matching elements
// initRange must be called before use.
// doSeek/doUnpack must not be called.
void find_matching_elements(uint32_t docid, std::vector<uint32_t> &dst);
};
}
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