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//
// $Id: G4GeometryTolerance.cc,v 1.3 2008/02/15 07:29:51 gcosmo Exp $
// GEANT4 tag $Name: geant4-09-02-ref-02 $
//
// class G4GeometryTolerance
//
// Implementation
//
// Author:
// 30.10.06 - G.Cosmo, first implementation
// --------------------------------------------------------------------

#include "G4GeometryTolerance.hh"
#include "globals.hh"

// ***************************************************************************
// Static class data
// ***************************************************************************
//
G4GeometryTolerance* G4GeometryTolerance::fInstance = 0;
G4bool G4GeometryTolerance::fInitialised = false;
G4double G4GeometryTolerance::fCarTolerance = 1E-9*mm;
G4double G4GeometryTolerance::fAngTolerance = 1E-9*rad;
G4double G4GeometryTolerance::fRadTolerance = 1E-9*mm;

// ***************************************************************************
// Constructor.
// ***************************************************************************
//
G4GeometryTolerance::G4GeometryTolerance()
{
}

// ***************************************************************************
// Empty destructor.
// ***************************************************************************
//
G4GeometryTolerance::~G4GeometryTolerance()
{
}

// ***************************************************************************
// Returns the instance of the singleton.
// Creates it in case it's called for the first time.
// ***************************************************************************
//
G4GeometryTolerance* G4GeometryTolerance::GetInstance()
{
  static G4GeometryTolerance theToleranceManager;
  if (!fInstance)
  {
    fInstance = &theToleranceManager;
  }
  return fInstance;    
}

// ***************************************************************************
// Accessors.
// ***************************************************************************
//
G4double G4GeometryTolerance::GetSurfaceTolerance() const
{
  return fCarTolerance;
}

G4double G4GeometryTolerance::GetAngularTolerance() const
{
  return fAngTolerance;
}

G4double G4GeometryTolerance::GetRadialTolerance() const
{
  return fRadTolerance;
}

// ***************************************************************************
// Sets the tolerance to a value computed on the basis of the world volume
// extent provided as argument. The method can be called only once.
// ***************************************************************************
//
void G4GeometryTolerance::SetSurfaceTolerance(G4double worldExtent)
{
  if (!fInitialised)
  {
    fCarTolerance = worldExtent*1E-11;
    fInitialised = true;
  }
  else
  {
    G4cout << "WARNING - G4GeometryTolerance::SetSurfaceTolerance()" << G4endl
           << "          Tolerance can only be set once. Currently set to: "
           << fCarTolerance/mm << " mm." << G4endl;
    G4Exception("G4GeometryTolerance::SetSurfaceTolerance()",
                "NotApplicable", JustWarning,
                "The tolerance has been already set!");
  }
}