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//
// $Id: G4PhysicalVolumeStore.cc,v 1.20 2008/07/10 09:41:20 gcosmo Exp $
// GEANT4 tag $Name: geant4-09-03 $
//
// G4PhysicalVolumeStore
//
// Implementation for singleton container
//
// History:
// 25.07.95 P.Kent Initial version
// --------------------------------------------------------------------

#include "G4Types.hh"
#include "G4PhysicalVolumeStore.hh"
#include "G4GeometryManager.hh"
#include "G4LogicalVolume.hh"

// ***************************************************************************
// Static class variables
// ***************************************************************************
//
G4PhysicalVolumeStore* G4PhysicalVolumeStore::fgInstance = 0;
G4VStoreNotifier* G4PhysicalVolumeStore::fgNotifier = 0;
G4bool G4PhysicalVolumeStore::locked = false;

// ***************************************************************************
// Protected constructor: Construct underlying container with
// initial size of 100 entries
// ***************************************************************************
//
G4PhysicalVolumeStore::G4PhysicalVolumeStore()
  : std::vector<G4VPhysicalVolume*>()
{
  reserve(100);
}

// ***************************************************************************
// Destructor
// ***************************************************************************
//
G4PhysicalVolumeStore::~G4PhysicalVolumeStore()
{
  Clean();
}

// ***************************************************************************
// Delete all elements from the store
// ***************************************************************************
//
void G4PhysicalVolumeStore::Clean()
{
  // Do nothing if geometry is closed
  //
  if (G4GeometryManager::GetInstance()->IsGeometryClosed())
  {
    G4cout << "WARNING - Attempt to delete the physical volume store"
           << " while geometry closed !" << G4endl;
    return;
  }

  // Locks store for deletion of volumes. De-registration will be
  // performed at this stage. G4VPhysicalVolumes will not de-register
  // themselves.
  //
  locked = true;

  size_t i=0;
  G4PhysicalVolumeStore* store = GetInstance();
  std::vector<G4VPhysicalVolume*>::iterator pos;

#ifdef G4GEOMETRY_VOXELDEBUG
  G4cout << "Deleting Physical Volumes ... ";
#endif

  for(pos=store->begin(); pos!=store->end(); pos++)
  {
    if (fgNotifier) { fgNotifier->NotifyDeRegistration(); }
    if (*pos) { delete *pos; }
    i++;
  }

#ifdef G4GEOMETRY_VOXELDEBUG
  if (store->size() < i-1)
    { G4cout << "No volumes deleted. Already deleted by user ?" << G4endl; }
  else
    { G4cout << i-1 << " volumes deleted !" << G4endl; }
#endif

  locked = false;
  store->clear();
}

// ***************************************************************************
// Associate user notifier to the store
// ***************************************************************************
//
void G4PhysicalVolumeStore::SetNotifier(G4VStoreNotifier* pNotifier)
{
  GetInstance();
  fgNotifier = pNotifier;
}

// ***************************************************************************
// Add Volume to container
// ***************************************************************************
//
void G4PhysicalVolumeStore::Register(G4VPhysicalVolume* pVolume)
{
  GetInstance()->push_back(pVolume);
  if (fgNotifier) { fgNotifier->NotifyRegistration(); }
}

// ***************************************************************************
// Remove Volume from container and update the list of daughters
// of the mother's logical volume
// ***************************************************************************
//
void G4PhysicalVolumeStore::DeRegister(G4VPhysicalVolume* pVolume)
{
  if (!locked)    // Do not de-register if locked !
  {
    if (fgNotifier) { fgNotifier->NotifyDeRegistration(); }
    G4LogicalVolume* motherLogical = pVolume->GetMotherLogical();
    if (motherLogical) { motherLogical->RemoveDaughter(pVolume); }
    for (iterator i=GetInstance()->begin(); i!=GetInstance()->end(); i++)
    {
      if (**i==*pVolume)
      {
        GetInstance()->erase(i);
        break;
      }
    }
  }
}

// ***************************************************************************
// Retrieve the first volume pointer in the container having that name
// ***************************************************************************
//
G4VPhysicalVolume*
G4PhysicalVolumeStore::GetVolume(const G4String& name, G4bool verbose) const
{
  for (iterator i=GetInstance()->begin(); i!=GetInstance()->end(); i++)
  {
    if ((*i)->GetName() == name) { return *i; }
  }
  if (verbose)
  {
     G4cerr << "ERROR - G4PhysicalVolumeStore::GetVolume()" << G4endl
            << "        Volume " << name << " NOT found in store !" << G4endl
            << "        Returning NULL pointer." << G4endl;
     G4Exception("G4PhysicalVolumeStore::GetVolume()", "InvalidQuery",
                 JustWarning, "Volume NOT found in store !");
  }
  return 0;
}

// ***************************************************************************
// Return ptr to Store, setting if necessary
// ***************************************************************************
//
G4PhysicalVolumeStore* G4PhysicalVolumeStore::GetInstance()
{
  static G4PhysicalVolumeStore worldStore;
  if (!fgInstance)
  {
    fgInstance = &worldStore;
  }
  return fgInstance;
}
