//
// $Id: GeometryObserver.cpp,v 1.2 2005/01/10 16:54:16 snyder Exp $
//
// File: GeometryObserver.cpp
// Purpose: 
// Created:  4-APR-2000   John Hobbs
//
// $Revision: 1.2 $
//
//

// Include files
#include "geometry_system/management/GeometryObserver.hpp"
#include "geometry_system/management/absGeometer.hpp"

// Global definitions
using namespace dgs;

// Constructors/Destructors
GeometryObserver::GeometryObserver(absObservedGeometer* myGeometer): 
  d_updated(false),d_myGeometer(myGeometer)
//
// Purpose: 
//
// Arguements:
//
// Returns:
//
{
  if( d_myGeometer ) d_myGeometer->add_observer(this);
}

GeometryObserver::GeometryObserver(const GeometryObserver& rhs):
  d_updated(rhs.d_updated), d_myGeometer(rhs.d_myGeometer)
//
// Purpose: 
//
// Arguements:
//
// Returns:
//
{
  if( d_myGeometer ) d_myGeometer->add_observer(this);
}

GeometryObserver& GeometryObserver::operator =(const GeometryObserver& rhs)
//
// Purpose: 
//
// Arguements:
//
// Returns:
//
{
  d_myGeometer = rhs.d_myGeometer;
  d_updated = rhs.d_updated;
  if( d_myGeometer ) d_myGeometer->add_observer(this);
  return *this;
}

GeometryObserver::~GeometryObserver()
{
  if( d_myGeometer ) d_myGeometer->remove_observer(this);
}


// Accessors
bool GeometryObserver::updated() 
{
  bool now = d_updated;
  d_updated = false;
  return now;
}

bool GeometryObserver::update() 
{
  bool now = d_updated;
  d_updated=true;      // This must precede user_update so that users can
  user_update();       // clear d_updated in user_update if they wish via
  return now;          // a call to updated()
}

// This is a (virtual)NOP.  
void GeometryObserver::user_update() {}