STEER/AliRndm.cxx

   1 /**************************************************************************
   2  * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
   3  *                                                                        *
   4  * Author: The ALICE Off-line Project.                                    *
   5  * Contributors are mentioned in the code where appropriate.              *
   6  *                                                                        *
   7  * Permission to use, copy, modify and distribute this software and its   *
   8  * documentation strictly for non-commercial purposes is hereby granted   *
   9  * without fee, provided that the above copyright notice appears in all   *
  10  * copies and that both the copyright notice and this permission notice   *
  11  * appear in the supporting documentation. The authors make no claims     *
  12  * about the suitability of this software for any purpose. It is          *
  13  * provided "as is" without express or implied warranty.                  *
  14  **************************************************************************/
  15
  16 /* $Id$ */
  17
  18 ///////////////////////////////////////////////////////////////////////////////
  19 //                                                                           //
  20 //                                                                           //
  21 ///////////////////////////////////////////////////////////////////////////////
  22
  23 #include "TFile.h"
  24 #include "TError.h"
  25 #include "TRandom3.h"
  26 #include "TSystem.h"
  27
  28 #include "AliRndm.h"
  29
  30 ClassImp(AliRndm)
  31
  32 //_______________________________________________________________________
  33 AliRndm::AliRndm():
  34   fRandom(gRandom)
  35 {
  36   //
  37   // Default ctor
  38   //
  39 }
  40
  41 //_______________________________________________________________________
  42 AliRndm::AliRndm(const AliRndm& rn):
  43   fRandom(gRandom)
  44 {
  45   //
  46   // Copy constructor
  47   //
  48   rn.Copy(*this);
  49 }
  50
  51 //_______________________________________________________________________
  52 void AliRndm::Copy(AliRndm&) const
  53 {
  54   ::Fatal("Copy","Not implemented\n");
  55 }
  56
  57
  58 //_____________________________________________________________________________
  59 void AliRndm::Rndm(Float_t* array, const Int_t size) const
  60 {
  61   //
  62   // Return an array of n random numbers uniformly distributed
  63   // between 0 and 1 not included
  64   //
  65   for(Int_t i=0; i<size; i++)
  66 #ifdef CKNONE
  67     array[i]=fRandom->Rndm();
  68 #else
  69     do array[i]=fRandom->Rndm(); while(0>=array[i] || array[i]>=1);
  70 #endif
  71 }
  72
  73 //_____________________________________________________________________________
  74 void AliRndm::ReadRandom(const char *filename)
  75 {
  76   //
  77   // Reads saved random generator status from filename
  78   //
  79   char *fntmp = gSystem->ExpandPathName(filename);
  80   TFile *file = new TFile(fntmp,"r");
  81   delete [] fntmp;
  82   if(!file) {
  83     printf("AliRndm:: Could not open file %s\n",filename);
  84   } else {
  85     if(!fRandom) fRandom = new TRandom();
  86     fRandom->Read("Random");
  87     file->Close();
  88     delete file;
  89   }
  90 }
  91
  92 //_____________________________________________________________________________
  93 void AliRndm::WriteRandom(const char *filename) const
  94 {
  95   //
  96   // Writes random generator status to filename
  97   //
  98   char *fntmp = gSystem->ExpandPathName(filename);
  99   TFile *file = new TFile(fntmp,"new");
 100   delete [] fntmp;
 101   if(!file) {
 102     printf("AliRndm:: Could not open file %s\n",filename);
 103   } else {
 104     fRandom->Write();
 105     file->Close();
 106     delete file;
 107   }
 108 }