dec13/tut_ana.C

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class FairRunAna;

// Check if file exists and readable
bool checkfile(TString fn)
{
        bool fileok=true;
        TFile fff(fn, "READ");
        if (fff.IsZombie()) fileok=false;
        TTree *t=(TTree*)fff.Get("pndsim");
        if (t==0x0) fileok=false;

        if (!fileok) cout <<"Skipping broken file '"<<fn<<"'"<<endl;
        fff.Close();

        return fileok;
}

// Add many input files to FairRunAna
void attachFiles(FairRunAna* fRun, TString pref, int min, int max)
{
        bool firstfile=true;
        for (int i=min;i<=max;++i) {
                TString fname = TString::Format("%s_%d_pid.root",pref.Data(),i);

                if (checkfile(fname) ) {
                        if (firstfile) fRun->SetInputFile(fname);
                        else fRun->AddFile(fname);
                        firstfile=false;
                }
        }
}

void tut_ana(TString pref="pid_complete.root", int min=-1, int max=1, int nevts=0)
{
        TString OutFile, inParFile;

        // *** add input files
        FairRunAna *fRun= new FairRunAna();

        // *** just open one file
        if (min<0)
        {
                // *** set input file, output file and par file
                OutFile   = "ana.root";
                inParFile = "simparams.root";

                fRun->SetInputFile(pref);
        }
        // *** attach many input files
        else {
                // *** set output file and par file
                OutFile   = TString::Format("%s_ana_%d_%d.root",pref.Data(), min, max);
                inParFile =     TString::Format("%s_%d_par.root",pref.Data(), min);

                attachFiles(fRun, pref, min, max);
        }

        // *** PID table with selection thresholds; can be modified by the user
        TString pidParFile = TString(gSystem->Getenv("VMCWORKDIR"))+"/macro/params/all.par";

        // *** initialization
        FairLogger::GetLogger()->SetLogToFile(kFALSE);
        FairRuntimeDb* rtdb = fRun->GetRuntimeDb();

        // *** setup parameter database
        FairParRootFileIo* parIO = new FairParRootFileIo();
        parIO->open(inParFile);
        FairParAsciiFileIo* parIOPid = new FairParAsciiFileIo();
        parIOPid->open(pidParFile.Data(),"in");

        rtdb->setFirstInput(parIO);
        rtdb->setSecondInput(parIOPid);
        rtdb->setOutput(parIO);

        fRun->SetOutputFile("dummyout.root");
        fRun->Init();

        // *** create an output file for all histograms
        TFile *out = TFile::Open(OutFile,"RECREATE");

        // *** the data reader object
        PndAnalysis* theAnalysis = new PndAnalysis();
        if (nevts==0) nevts= theAnalysis->GetEntries();

        int i=0;

        // *** the event loop
        while (theAnalysis->GetEvent() && i++<nevts)
        {
                if ((i%100)==0) cout<<"evt " << i << endl;

                // ***
                // *** HERE YOUR ANALYSIS CODE GOES!
                // ***

        }

        // *** write out all the histos
        out->cd();
        out->Save();
        out->Close();

}