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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 <vespa/vespalib/stllike/string.h>
namespace vespalib {
/**
* This is an abstract class used to visit structured objects. It
* contains a basic interface that is intended to be overridden by
* subclasses. As an extension to this class, the visit.hpp file
* contains various versions of the visit method that maps visitation
* of various types into invocations of the basic interface defined by
* this class.
**/
class ObjectVisitor
{
public:
/**
* Open a (sub-)structure
*
* @param name name of structure
* @param type type of structure
**/
virtual void openStruct(const vespalib::string &name, const vespalib::string &type) = 0;
/**
* Close a (sub-)structure
**/
virtual void closeStruct() = 0;
/**
* Visit a boolean value
*
* @param name variable name
* @param value variable value
**/
virtual void visitBool(const vespalib::string &name, bool value) = 0;
/**
* Visit an integer value
*
* @param name variable name
* @param value variable value
**/
virtual void visitInt(const vespalib::string &name, int64_t value) = 0;
/**
* Visit a floating-point value
*
* @param name variable name
* @param value variable value
**/
virtual void visitFloat(const vespalib::string &name, double value) = 0;
/**
* Visit a string value
*
* @param name variable name
* @param value variable value
**/
virtual void visitString(const vespalib::string &name, const vespalib::string &value) = 0;
/**
* Visit method used to indicate that an optional substructure is
* not present.
*
* @param name variable name
**/
virtual void visitNull(const vespalib::string &name) = 0;
/**
* Visit method invoked by the default implementation of member
* visitation to signal that member visitation is not yet implemented.
*
* @param name variable name
* @param value variable value
**/
virtual void visitNotImplemented() = 0;
/**
* empty
**/
virtual ~ObjectVisitor();
};
} // namespace vespalib
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