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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 "matchdata.h"
#include "termfieldmatchdata.h"
namespace search::fef {
class PhraseSplitterQueryEnv;
/**
* This class is used together with PhraseSplitterQueryEnv to split
* all phrase terms in a query environment into separate terms. New
* TermFieldMatchData objects are created for each splitted phrase
* term and managed by this class. Unmodified single terms are served
* from the query environment and match data.
*
* The TermFieldMatchData objects managed by this class are updated
* based on the TermFieldMatchData objects associated with the
* original phrase terms. Positions are adjusted with +1 for each term
* after the first one.
*
* Use this class and PhraseSplitterQueryEnv if you want to handle a
* phrase term the same way as single terms.
**/
class PhraseSplitter
{
const PhraseSplitterQueryEnv& _phrase_splitter_query_env;
TermFieldHandle _skipHandles;
const MatchData *_matchData;
std::vector<TermFieldMatchData> _termMatches; // match objects associated with splitted terms
TermFieldMatchData *resolveSplittedTermField(TermFieldHandle handle) {
return &_termMatches[handle - _skipHandles];
}
const TermFieldMatchData *resolveSplittedTermField(TermFieldHandle handle) const {
return &_termMatches[handle - _skipHandles];
}
public:
/**
* Create a phrase splitter based on the given query environment.
*
* @param queryEnv the query environment to wrap.
* @param field the field where we need to split phrases
**/
PhraseSplitter(const PhraseSplitterQueryEnv &phrase_splitter_query_env);
~PhraseSplitter();
/**
* Copy the source object to the destination object.
* Use the given hit offset when copying position information. pos (x) -> pos (x + hitOffset).
*
* @param dst the destination object.
* @param src the source object.
* @param hitOffset the offset to use when copying position information.
**/
static void copyTermFieldMatchData(TermFieldMatchData & dst, const TermFieldMatchData & src, uint32_t hitOffset);
/**
* Update the underlying TermFieldMatchData objects based on the bound MatchData object.
**/
void update();
/**
* Inherit doc from MatchData.
**/
const TermFieldMatchData * resolveTermField(TermFieldHandle handle) const {
if (_matchData == nullptr) {
return nullptr;
}
return handle < _skipHandles ? _matchData->resolveTermField(handle) : resolveSplittedTermField(handle);
}
void bind_match_data(const fef::MatchData &md) { _matchData = &md; }
const PhraseSplitterQueryEnv& get_query_env() const { return _phrase_splitter_query_env; }
};
}
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