Program Listing for File callback_property.h

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#pragma once

#include "property.h"

class InterfaceObject;

template <class T> class CallbackProperty : public Property
{
    public:
        CallbackProperty(T* io, PropertyID id, bool writeEnable, PropertyDataType type, uint16_t maxElements,
                         uint8_t access, uint8_t (*readCallback)(T*, uint16_t, uint8_t, uint8_t*),
                         uint8_t (*writeCallback)(T*, uint16_t, uint8_t, const uint8_t*))
            : Property(id, writeEnable, type, maxElements, access),
              _interfaceObject(io), _readCallback(readCallback), _writeCallback(writeCallback)
        {}
        CallbackProperty(T* io, PropertyID id, bool writeEnable, PropertyDataType type, uint16_t maxElements,
                         uint8_t access, uint8_t (*readCallback)(T*, uint16_t, uint8_t, uint8_t*))
            : Property(id, writeEnable, type, maxElements, access), _interfaceObject(io), _readCallback(readCallback)
        {}

        uint8_t read(uint16_t start, uint8_t count, uint8_t* data) const override
        {
            if (count == 0 || _readCallback == nullptr || start > _maxElements || start + count > _maxElements + 1)
                return 0;

            return _readCallback(_interfaceObject, start, count, data);
        }
        uint8_t write(uint16_t start, uint8_t count, const uint8_t* data) override
        {
            if (count == 0 || start > _maxElements || start + count > _maxElements + 1 || _writeCallback == nullptr)
                return 0;

            return _writeCallback(_interfaceObject, start, count, data);
        }
    private:
        T* _interfaceObject = nullptr;
        uint8_t (*_readCallback)(T*, uint16_t, uint8_t, uint8_t*) = nullptr;
        uint8_t (*_writeCallback)(T*, uint16_t, uint8_t, const uint8_t*) = nullptr;
};