DataElement.h

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#ifndef DATAELEMENT_H_
#define DATAELEMENT_H_

#include <string>
#include <stdexcept>
#include <boost/variant.hpp>
#include <boost/lexical_cast.hpp>
#include <stdint.h>
#include "nasa_common_logging/Logger.h"
#include "shared_memory_transport/resource.hpp"

class DataElement
{
public:
    // Public typedefs -----------------------------------------------------
    typedef boost::variant<bool, int16_t, int32_t, uint16_t, uint32_t, float> ValueType;

    // Public enums --------------------------------------------------------
    enum ElementSize
    {
        EightBit,    
        SixteenBit,  
        ThirtyTwoBit 
    };

    enum ReadWrite
    {
        Read, 
        Write 
    };

    // Public members ------------------------------------------------------
    ValueType                 value;          
    ReadWrite                 readWrite;      
    std::shared_ptr<SMT::Resource> smtResource;    
    // Public function prototypes ------------------------------------------
    DataElement();
    DataElement(const std::string& type, ReadWrite readWrite, std::shared_ptr<SMT::Resource> resource = nullptr);
    virtual                    ~DataElement();
    template <typename T> T    getValue() const;
    template <typename T> void setValue(const T v);
    const std::type_info*      getType();
    ElementSize                getSize();
    ReadWrite                  getReadWrite();
    void                       setReadWrite(ReadWrite readWrite);
    virtual std::string        toString();
};

// Templated methods ---------------------------------------------------

template <typename T>
T DataElement::getValue() const
{
    // @todo change this to use our copy of the type.
    if (value.type() == typeid(T))
    {
        // Only get from the boost::variant for now.
        return boost::get<T>(value);
    }
    else
    {
        std::stringstream err;
        err << "DataElement::getValue() - Template type must match the underlying variant type.";
        NasaCommonLogging::Logger::log("gov.nasa.robonet.DataElement", log4cpp::Priority::ERROR, err.str());
        throw std::invalid_argument(err.str());
    }
}

template <typename T>
void DataElement::setValue(const T v)
{
    // Assign the value to the boost::variant storage
    value = v;

    // If we have a valid SMT Resource, send the value to it as well.
    if (smtResource){
        smtResource->set<T>(v);
    }
}

#endif /* DATAELEMENT_H_ */