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#pragma once
#include <Functions/JSONPath/Generator/VisitorStatus.h>
namespace DB
{
template <typename JSONParser>
class IVisitor
{
public:
virtual const char * getName() const = 0;
/**
* Applies this visitor to document and mutates its state
* @param element simdjson element
*/
virtual VisitorStatus visit(typename JSONParser::Element & element) = 0;
/**
* Applies this visitor to document, but does not mutate state
* @param element simdjson element
*/
virtual VisitorStatus apply(typename JSONParser::Element & element) const = 0;
/**
* Restores visitor's initial state for later use
*/
virtual void reinitialize() = 0;
virtual void updateState() = 0;
bool isExhausted() { return is_exhausted; }
void setExhausted(bool exhausted) { is_exhausted = exhausted; }
virtual ~IVisitor() = default;
private:
/**
* This variable is for detecting whether a visitor's next visit will be able
* to yield a new item.
*/
bool is_exhausted = false;
};
}
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