DelayMeter.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_core_util_DelayMeter_hpp
#define anna_core_util_DelayMeter_hpp

#include <string>

namespace anna {

template <class _TimeUnit> class DelayMeter {
public:
  DelayMeter() { a_timestamp = _TimeUnit::getTime(); }

  DelayMeter(const DelayMeter& other) : a_timestamp(other.a_timestamp), a_topReference(other.a_topReference) { ;}

  void setControlPoint() {
    a_timestamp = _TimeUnit::getTime();
    clearTopReference();
  }

  void setControlPoint(const _TimeUnit& timestamp) {
    a_timestamp = timestamp;
    clearTopReference();
  }

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

  void clearTopReference() { a_topReference = _TimeUnit(0); }

  void clear() { a_timestamp = 0; }

  _TimeUnit getValue() const {
    a_now = (a_topReference == _TimeUnit(0)) ? _TimeUnit::getTime() : a_topReference;
    return (a_now > a_timestamp) ? (a_now - a_timestamp) : _TimeUnit(0);
  }

  _TimeUnit getValue(const _TimeUnit& now) const {
    return ((a_now = now) > a_timestamp) ? (a_now - a_timestamp) : _TimeUnit(0);
  }

  const _TimeUnit& getNow() const { return a_now; }

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

  bool operator> (const _TimeUnit& left) const { return getValue() > left; }

  bool operator< (const _TimeUnit& left) const { return getValue() < left; }

  std::string asString() const { return getValue().asString(); }

  std::string asDebugString(const char* whatis) const {
    std::string result(whatis);
    result += " { TopReference: ";
    result += a_topReference.asString();
    result += " | TimeStamp: ";
    result += a_timestamp.asString();
    result += " | Now: ";
    result += a_now.asString();
    return result += " }";
  }

private:
  _TimeUnit a_topReference;
  _TimeUnit a_timestamp;
  mutable _TimeUnit a_now;
};

}

#endif