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source: svn/trunk/src/DelphesRootConverter.cc@ 477

Last change on this file since 477 was 457, checked in by Xavier Rouby, 15 years ago

new class for inputing directly rootfiles from Delphes (with GEN tree)
File size: 3.8 KB
Line 
1/***********************************************************************
2** **
3** /----------------------------------------------\ **
4** | Delphes, a framework for the fast simulation | **
5** | of a generic collider experiment | **
6** \------------- arXiv:0903.2225v1 ------------/ **
7** **
8** **
9** This package uses: **
10** ------------------ **
11** ROOT: Nucl. Inst. & Meth. in Phys. Res. A389 (1997) 81-86 **
12** FastJet algorithm: Phys. Lett. B641 (2006) [hep-ph/0512210] **
13** Hector: JINST 2:P09005 (2007) [physics.acc-ph:0707.1198v2] **
14** FROG: [hep-ex/0901.2718v1] **
15** HepMC: Comput. Phys. Commun.134 (2001) 41 **
16** **
17** ------------------------------------------------------------------ **
18** **
19** Main authors: **
20** ------------- **
21** **
22** Severine Ovyn Xavier Rouby **
23** severine.ovyn@uclouvain.be xavier.rouby@cern **
24** **
25** Center for Particle Physics and Phenomenology (CP3) **
26** Universite catholique de Louvain (UCL) **
27** Louvain-la-Neuve, Belgium **
28** **
29** Copyright (C) 2008-2009, **
30** All rights reserved. **
31** **
32***********************************************************************/
33
34#include <iostream>
35#include <fstream>
36#include <iomanip>
37#include <cmath>
38#include "TChain.h"
39#include "TFile.h"
40#include "DelphesRootConverter.h"
41using namespace std;
42
43DelphesRootConverter::DelphesRootConverter(const string& inputFileList, const string& outputFileName, const int& Nevents)
44{
45
46 // Open a stream connected to an event file:
47 ifstream infile(inputFileList.c_str());
48 string filename;
49 if(!infile.is_open()) {
50 cerr << left << setw(30) <<"** ERROR: Can't open "<<""
51 << left << setw(20) << inputFileList <<""
52 << right << setw(19) <<"for input **"<<""<<endl;
53 exit(1);
54 }
55
56 TChain chainGEN("GEN");
57 while(1)
58 {
59 infile >> filename;
60 if(!infile.good()) break;
61 ifstream checking_the_file(filename.c_str());
62 if(!checking_the_file.good())
63 {
64 cerr << left << setw(30) <<"** ERROR: Can't find file "<<""
65 << left << setw(20) << filename <<""
66 << right << setw(19) <<"for input **"<<""<<endl;
67 continue;
68 }
69 else checking_the_file.close();
70
71 chainGEN.Add(filename.c_str());
72 }
73
74 TFile * newFile = TFile::Open(outputFileName.c_str(),"RECREATE");
75 newFile->cd();
76 TTree * copiedChain;
77 int nevents = min(Nevents,(int)chainGEN.GetEntries());
78 if(nevents<0) copiedChain = chainGEN.CopyTree(""); // copy the whole chain
79 else copiedChain = chainGEN.CopyTree("","",nevents); // copy a smaller part of the chain
80 copiedChain->Write();
81 newFile->Close();
82
83}
84
85
86
87
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