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//
// $Id: G4CrossSectionDataSetRegistry.cc,v 1.6 2009/12/02 15:59:59 vnivanch Exp $
// GEANT4 tag $Name: geant4-09-03 $
//
// -------------------------------------------------------------------
//
// GEANT4 Class file
//
//
// File name:    G4CrossSectionDataSetRegistry
//
// Author  V.Ivanchenko  24.01.2009
//
// Modifications:
//

#include "G4CrossSectionDataSetRegistry.hh"
#include "G4VCrossSectionDataSet.hh"

G4CrossSectionDataSetRegistry* G4CrossSectionDataSetRegistry::theInstance = 0;

G4CrossSectionDataSetRegistry* G4CrossSectionDataSetRegistry::Instance()
{
  if(0 == theInstance) {
    static G4CrossSectionDataSetRegistry manager;
    theInstance = &manager;
  }
  return theInstance;
}

G4CrossSectionDataSetRegistry::G4CrossSectionDataSetRegistry()
{}

G4CrossSectionDataSetRegistry::~G4CrossSectionDataSetRegistry()
{
  Clean();
}

void G4CrossSectionDataSetRegistry::Clean()
{
  size_t n = xSections.size(); 
  if(n > 0) {
    for (size_t i=0; i<n; ++i) {
      if(xSections[i]) {
	G4VCrossSectionDataSet* p = xSections[i];
	xSections[i] = 0;
	delete p;
      }
    }
    xSections.clear();
  }
}

void G4CrossSectionDataSetRegistry::Register(G4VCrossSectionDataSet* p)
{
  if(!p) return;
  size_t n = xSections.size(); 
  if(n > 0) {
    for (size_t i=0; i<n; ++i) {
      if(xSections[i] == p) { return; }
    }
  }
  xSections.push_back(p);
}

void G4CrossSectionDataSetRegistry::DeRegister(G4VCrossSectionDataSet* p)
{
  if(!p) return;
  size_t n = xSections.size(); 
  if(n > 0) {
    for (size_t i=0; i<n; ++i) {
      if(xSections[i] == p) {
        xSections[i] = 0;
	if(i == n-1) { xSections.pop_back(); }
	return;
      }
    }
  }
}