returns.h

#ifndef _RETURNS_H
#define _RETURNS_H
/*
 * Fledge storage client.
 *
 * Copyright (c) 2018 OSisoft, LLC
 *
 * Released under the Apache 2.0 Licence
 *
 * Author: Mark Riddoch
 */
#include <string>
#include <sstream>
#include <iostream>


class Returns {
    public:
        Returns(const std::string& column) :
                m_column(column) {};
        Returns(const std::string& column, const std::string& alias) :
                m_column(column), m_alias(alias) {};
        Returns(const std::string& column, const std::string& alias, const std::string& format) :
                m_column(column), m_alias(alias), m_format(format) {};
        ~Returns() {};
        void        format(const std::string format)
        {
            m_format = format;
        }
        void        timezone(const std::string timezone)
        {
            m_timezone = timezone;
        }
        std::string toJSON()
        {
        std::ostringstream json;

            if ((! m_alias.empty()) || (! m_format.empty()) || (! m_timezone.empty()))
            {
                json << "{ ";
                json << "\"column\" : \"" << m_column << "\"";
                if (! m_alias.empty())
                    json << ", \"alias\" : \"" << m_alias << "\"";
                if (! m_format.empty())
                    json << ", \"format\" : \"" << m_format << "\"";
                if (! m_timezone.empty())
                    json << ", \"timezone\" : \"" << m_timezone << "\"";
                json << " }";
            }
            else
            {
                json << "\"" << m_column << "\"";
            }
            return json.str();
        }
    private:
        const std::string   m_column;
        const std::string   m_alias;
        std::string     m_format;
        std::string     m_timezone;
};
#endif