/*****************************************************************************
 * Project: RooFit                                                           *
 *                                                                           *
 * Copyright (c) 2000-2005, Regents of the University of California          *
 *                          and Stanford University. All rights reserved.    *
 *                                                                           *
 * Redistribution and use in source and binary forms,                        *
 * with or without modification, are permitted according to the terms        *
 * listed in LICENSE (http://roofit.sourceforge.net/license.txt)             *
 *****************************************************************************/

#ifndef ROONUMRUNNINGINT
#define ROONUMRUNNINGINT

#include "RooAbsCachedReal.h"
#include "RooRealProxy.h"
#include "RooAbsReal.h"


class RooNumRunningInt : public RooAbsCachedReal {
public:
  RooNumRunningInt(const char *name, const char *title, RooAbsReal& _func, RooRealVar& _x, const char* binningName="cache");
  RooNumRunningInt(const RooNumRunningInt& other, const char* name=0) ;
  virtual TObject* clone(const char* newname) const { return new RooNumRunningInt(*this,newname); }
  virtual ~RooNumRunningInt() ;

protected:

  class RICacheElem: public FuncCacheElem {
  public:
    RICacheElem(const RooNumRunningInt& ri, const RooArgSet* nset) ;
    ~RICacheElem() ;
    virtual RooArgList containedArgs(Action) ;
    void calculate(Bool_t cdfmode) ;
    void addRange(Int_t ixlo, Int_t ixhi, Int_t nbins) ;
    void addPoint(Int_t ix) ;

    RooNumRunningInt* _self ;
    Double_t* _ax ;
    Double_t* _ay ;    
    RooRealVar* _xx ; 

  } ;

  friend class RICacheElem ;
  virtual const char* binningName() const { return _binningName.c_str() ; }
  virtual FuncCacheElem* createCache(const RooArgSet* nset) const ;
  virtual const char* inputBaseName() const ; 
  virtual RooArgSet* actualObservables(const RooArgSet& nset) const ;
  virtual RooArgSet* actualParameters(const RooArgSet& nset) const ;
  virtual void fillCacheObject(FuncCacheElem& cacheFunc) const ;
  virtual Double_t evaluate() const ;
  
  RooRealProxy func ; // Proxy to functions whose running integral is calculated
  RooRealProxy x   ; // Intergrated observable
  std::string _binningName ; // Name of binning to be used for cache histogram

private:

  ClassDef(RooNumRunningInt,1) // Numeric calculator for running integral of a given function

};
 
#endif