Meter.hpp

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// ANNA - Anna is Not Nothingness Anymore                                                         //
//                                                                                                //
// (c) Copyright 2005-2015 Eduardo Ramos Testillano & Francisco Ruiz Rayo                         //
//                                                                                                //
// See project site at http://redmine.teslayout.com/projects/anna-suite                           //
// See accompanying file LICENSE or copy at http://www.teslayout.com/projects/public/anna.LICENSE //


#ifndef anna_timex_Meter_hpp
#define anna_timex_Meter_hpp

#include <anna/core/functions.hpp>

namespace anna {

namespace timex {

class Meter {
public:
  Meter() { a_timestamp = functions::millisecond(); a_topReference = 0; }

  Meter(const Meter& other) : a_timestamp(other.a_timestamp) { a_topReference = 0; ;}

  Millisecond setControlPoint() {
    Millisecond now = functions::millisecond();
    Millisecond result = (now > a_timestamp) ? (now - a_timestamp) : (Millisecond)0;
    a_timestamp = now;
    clearTopReference();
    return result;
  }

  void setTopReference(const Millisecond & topReference) { a_topReference = topReference; }

  void clearTopReference() { a_topReference = 0; }

  Millisecond getDelay() const {
    Millisecond now = (a_topReference == 0) ? functions::millisecond() : a_topReference;
    return (now > a_timestamp) ? (now - a_timestamp) : (Millisecond)0;
  }

  Meter& operator= (const Millisecond & timestamp) { a_timestamp = timestamp; a_topReference = 0; return *this; }

  Meter& operator= (const Meter& other) { a_timestamp = other.a_timestamp; a_topReference = other.a_topReference; return *this; }

private:
  Millisecond a_topReference;
  Millisecond a_timestamp;
};

}
}

#endif