#ifndef PROPAGATION_DELAY_MODEL_H

#define PROPAGATION_DELAY_MODEL_H

#include "ns3/ptr.h"

#include "ns3/object.h"

#include "ns3/nstime.h"

namespace ns3 {

class RandomVariable;

class PropagationDelayModel : public Object

{

public:

  virtual ~PropagationDelayModel ();

  virtual Time GetDelay (double distance) const = 0;

};

class RandomPropagationDelayModel : public PropagationDelayModel

{

public:

  RandomPropagationDelayModel (const RandomVariable &variable);

  virtual ~RandomPropagationDelayModel ();

  virtual Time GetDelay (double distance) const;

private:

  RandomVariable *m_variable;

};

class ConstantSpeedPropagationDelayModel : public PropagationDelayModel

{

public:

  ConstantSpeedPropagationDelayModel ();

  ConstantSpeedPropagationDelayModel (double speed);

  virtual Time GetDelay (double distance) const;

  void SetSpeed (double speed);

  double GetSpeed (void) const;

private:

  double m_speed;

};

} // namespace ns3

#endif /* PROPAGATION_DELAY_MODEL_H */