// @(#)root/roostats:$Id$
// Author: Kyle Cranmer, Lorenzo Moneta, Gregory Schott, Wouter Verkerke
 * Copyright (C) 1995-2008, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *

#ifndef ROOSTATS_HypoTestCalculator
#define ROOSTATS_HypoTestCalculator

//#include "TNamed.h"

#ifndef ROOT_Rtypes
#include "Rtypes.h"

HypoTestCalculator is an interface class for a tools which produce RooStats HypoTestResults.  
The interface currently assumes that any hypothesis test calculator can be configured by specifying:
 <li>a model for the null,</li>
 <li>a model for the alternate,</li>
 <li>a data set, </li>
 <li>a set of parameters of which specify the null (including values and const/non-const status), and </li>
 <li>a set of parameters of which specify the alternate (including values and const/non-const status).</li>
The interface allows one to pass the model, data, and parameters via a workspace and then specify them with names.
The interface will be extended so that one does not need to use a workspace.
After configuring the calculator, one only needs to ask GetHypoTest, which will return a HypoTestResult pointer.
The concrete implementations of this interface should deal with the details of how the nuisance parameters are
dealt with (eg. integration vs. profiling) and which test-statistic is used (perhaps this should be added to the interface).
The motivation for this interface is that we hope to be able to specify the problem in a common way for several concrete calculators.

// class RooAbsPdf;
class RooAbsData;
// class RooArgSet; 
class RooWorkspace; 

namespace RooStats {

   class HypoTestResult;

   class ModelConfig;

   class HypoTestCalculator {


      virtual ~HypoTestCalculator() {}

      // main interface to get a HypoTestResult, pure virtual
      virtual HypoTestResult* GetHypoTest() const = 0;

      // Set a common model for both the null and alternate, add to the the workspace if not already there
      virtual void SetCommonModel(const ModelConfig& model) { 

      // Set the model for the null hypothesis
      virtual void SetNullModel(const ModelConfig& model) = 0;
      // Set the model for the alternate hypothesis
      virtual void SetAlternateModel(const ModelConfig& model) = 0;
      // Set the DataSet
      virtual void SetData(RooAbsData& data) = 0;

      ClassDef(HypoTestCalculator,1)  // Interface for tools doing hypothesis tests