/**
 *  Envelope.h
 *
 *  When you send or receive a message to the rabbitMQ server, it is encapsulated
 *  in an envelope that contains additional meta information as well.
 *
 *  @copyright 2014 - 2017 Copernica BV
 */

/**
 *  Include guard
 */
#pragma once

/**
 *  Dependencies
 */
#include "metadata.h"

/**
 *  Set up namespace
 */
namespace AMQP {

/**
 *  Class definition
 */
class Envelope : public MetaData
{
protected:
    /**
     *  Pointer to the body data (the memory is not managed by the AMQP library!)
     *  @var    const char *
     */
    char *_body;

    /**
     *  Size of the data
     *  @var    uint64_t
     */
    uint64_t _bodySize;
    
    /**
     *  Was the data allocated by this object?
     *  @var    bool
     */
    bool _allocated = false;

public:
    /**
     *  Constructor
     *
     *  The data buffer that you pass to this constructor must be valid during
     *  the lifetime of the Envelope object.
     *
     *  @param  body
     *  @param  size
     */
    Envelope(const char *body, uint64_t size) : MetaData(), _body((char *)body), _bodySize(size) {}

    /**
     *  Disabled copy constructor
     *
     *  @param  envelope    the envelope to copy
     */
    Envelope(const Envelope &envelope) = delete;

    /**
     *  Destructor
     */
    virtual ~Envelope()
    {
        // deallocate the data
        if (_allocated) free(_body);
    }

    /**
     *  Access to the full message data
     *  @return buffer
     */
    const char *body() const
    {
        return _body;
    }

    /**
     *  Size of the body
     *  @return uint64_t
     */
    uint64_t bodySize() const
    {
        return _bodySize;
    }
};

/**
 *  End of namespace
 */
}