reading_set.h

#ifndef _READINGSET_H
#define _READINGSET_H
/*
 * Fledge storage client.
 *
 * Copyright (c) 2018 Dianomic Systems
 *
 * Released under the Apache 2.0 Licence
 *
 * Author: Mark Riddoch, Massimiliano Pinto
 */
#include <string>
#include <string.h>
#include <sstream>
#include <iostream>
#include <reading.h>
#include <rapidjson/document.h>
#include <vector>

class ReadingSet {
    public:
        ReadingSet();
        ReadingSet(const std::string& json);
        ReadingSet(const std::vector<Reading *>* readings);
        virtual ~ReadingSet();

        unsigned long           getCount() const { return m_readings.size(); };
        const Reading           *operator[] (const unsigned int idx) {
                            return m_readings[idx];
                        };

        // Return the const reference of readings data
        const std::vector<Reading *>&   getAllReadings() const { return m_readings; };
        // Return the reference of readings
        std::vector<Reading *>*     getAllReadingsPtr() { return &m_readings; };

        // Remove readings from reading set and return reference to readings
        std::vector<Reading *>* moveAllReadings();
        // Delete a reading from reading set and return pointer of deleted reading
        Reading* removeReading(unsigned long id);
        
        // Return the reading id of the last  data element
        unsigned long           getLastId() const { return m_last_id; };
        unsigned long           getReadingId(uint32_t pos);
        void                append(ReadingSet *);
        void                append(ReadingSet&);
        void                append(std::vector<Reading *> &);
        void                removeAll();
        void                clear();
        bool                copy(const ReadingSet& src);

    protected:
        unsigned long           m_count;
        ReadingSet(const ReadingSet&);
        ReadingSet&         operator=(ReadingSet const &);
        std::vector<Reading *>      m_readings;
        // Id of last Reading element
        unsigned long           m_last_id;    // Id of the last Reading
};

class JSONReading : public Reading {
    public:
        JSONReading(const rapidjson::Value& json);
        ~JSONReading() {};

        // Return the reading id
        unsigned long   getId() const { return m_id; };

    private:
        Datapoint   *datapoint(const std::string& name, const rapidjson::Value& json);
                void        escapeCharacter(std::string& stringToEvaluate, std::string pattern);
};

class ReadingSetException : public std::exception
{
    public:
        ReadingSetException(const char *what)
        {
            m_what = strdup(what);
        };
        ~ReadingSetException()
        {
            if (m_what)
                free(m_what);
        };
        virtual const char *what() const throw()
        {
            return m_what;
        };
    private:
        char *m_what;
};
#endif