0fcda94162
Summary: Hardcoded query infrastructure - first concrete version - USEFUL FOR: POCs & pilots Test Plan: manual + jenkins Reviewers: sale, florijan Reviewed By: florijan Subscribers: pullbot, buda Differential Revision: https://phabricator.memgraph.io/D45
60 lines
1.6 KiB
C++
60 lines
1.6 KiB
C++
#pragma once
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#include "logging/loggable.hpp"
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#include "query/stripper.hpp"
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/*
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* Query preprocessing contains:
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* * query stripping
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*
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* This class is here because conceptually process of query preprocessing
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* might have more than one step + in current version of C++ standard
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* isn't trivial to instantiate QueryStripper because of template arguments +
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* it depends on underlying lexical analyser.
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*
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* The preprocessing results are:
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* * stripped query |
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* * stripped arguments |-> StrippedQuery
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* * stripped query hash |
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*/
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class QueryPreprocessor : public Loggable
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{
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private:
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// In C++17 the ints will be removed.
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// as far as I understand in C++17 class template parameters
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// can be deduced just like function template parameters
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// TODO: once C++ 17 will be well suported by comilers
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// refactor this piece of code because it is hard to maintain.
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using QueryStripperT = QueryStripper<int, int, int, int>;
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public:
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using HashT = QueryStripperT::HashT;
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QueryPreprocessor() : Loggable("QueryPreprocessor"),
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stripper(make_query_stripper(TK_LONG, TK_FLOAT, TK_STR, TK_BOOL))
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{
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}
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/**
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* Preprocess the query:
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* * strip parameters
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* * calculate query hash
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*
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* @param query that is going to be stripped
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*
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* @return QueryStripped object
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*/
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auto preprocess(const std::string &query)
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{
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auto preprocessed = stripper.strip(query);
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logger.info("stripped_query = {}", preprocessed.query);
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logger.info("query_hash = {}", preprocessed.hash);
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return stripper.strip(query);
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}
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private:
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QueryStripperT stripper;
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};
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