#ifndef ALIROOT_PWG2_FORWARD_ALIFORWARDUTIL_H
#define ALIROOT_PWG2_FORWARD_ALIFORWARDUTIL_H
#include <TObject.h>
class TH2D;
class TAxis;

/** 
 * Utilities used in the forward multiplcity analysis 
 * 
 * @ingroup pwg2_forward_analysis 
 */
class AliForwardUtil : public TObject
{
 public:
  /** 
   * Structure to hold histograms 
   *
   * @ingroup pwg2_forward_analysis 
   */
  struct Histos : public TObject
  {	
    /** 
     * Constructor 
     * 
     * 
     */
    Histos() : fFMD1i(0), fFMD2i(0), fFMD2o(0), fFMD3i(0), fFMD3o(0) {}
    /** 
     * Copy constructor 
     * 
     * @param o Object to copy from 
     */
    Histos(const Histos& o) 
      : TObject(o), 
	fFMD1i(o.fFMD1i), 
	fFMD2i(o.fFMD2i), 
	fFMD2o(o.fFMD2o), 
	fFMD3i(o.fFMD3i), 
	fFMD3o(o.fFMD3o)
    {}
    /** 
     * Assignement operator 
     * 
     * @return Reference to this 
     */
    Histos& operator=(const Histos&) { return *this;}
    /** 
     * Destructor
     */
    ~Histos();
    /** 
     * Initialize the object 
     * 
     * @param etaAxis Eta axis to use 
     */
    void Init(const TAxis& etaAxis);
    /** 
     * Make a histogram 
     * 
     * @param d        Detector
     * @param r        Ring 
     * @param etaAxis  Eta axis to use
     * 
     * @return Newly allocated histogram 
     */
    TH2D* Make(UShort_t d, Char_t r, const TAxis& etaAxis) const;
    /** 
     * Clear data 
     * 
     * @param option Not used 
     */
    void  Clear(Option_t* option="");
    // const TH2D* Get(UShort_t d, Char_t r) const;
    /** 
     * Get the histogram for a particular detector,ring
     * 
     * @param d Detector 
     * @param r Ring 
     * 
     * @return Histogram for detector,ring or nul 
     */
    TH2D* Get(UShort_t d, Char_t r) const;
    TH2D* fFMD1i; // Histogram for FMD1i
    TH2D* fFMD2i; // Histogram for FMD2i
    TH2D* fFMD2o; // Histogram for FMD2o
    TH2D* fFMD3i; // Histogram for FMD3i
    TH2D* fFMD3o; // Histogram for FMD3o
  };

};

#endif
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