RandObj.h

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/***************************************************************************
 *   Copyright (C) 2004 by Olivier Stezowski                               *
 *   stezow(AT)ipnl.in2p3.fr                                                  *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 ***************************************************************************/
 
#ifndef GW_RANDOBJ_H
#define GW_RANDOBJ_H

#ifndef ROOT_TObjArray
#include <TObjArray.h>
#endif

#ifndef GW_RANDOM_H
#include "Random.h"
#endif

#include <vector>

class TH1;

namespace Gw {

class RandObj : public TObject
{
private:
    Random *fRand;                      // unique instance to Rand
    
    TObjArray fObj;                     // used to store a array of pointers to objects 
       
    std::vector<Float_t> fCumu;         // used to store the cumulative function
    std::vector<Float_t> fWeight;       // used to store the weight distribution

    void ComputeCumu();

public:
    RandObj() ;
    virtual ~RandObj() ;

    virtual TObject * Rand();
    

    virtual TObject * Rand(Int_t &);


    virtual void Add(TObject *, Float_t);
    
    virtual void Clear(Option_t *opt = "");
    
    virtual Int_t GetSize() const { return fObj.GetEntries(); }
    virtual TObject * At(Int_t slot) const { return fObj.At(slot); }
    
    virtual Float_t WeightAt(Int_t slot) const { if ( 0 <= slot && slot < fObj.GetEntries() ) return fWeight[slot] ; return 0.0; }
    

    virtual void FillRandom(TH1 *h, Int_t ntimes = 5000);
     
    virtual void ls(Option_t *) const;
    
    ClassDef(RandObj,0); // a class to randomly select object in a TObjArray collection
};
// inline members

}

#endif