library: libHbook #include "THbookFile.h"

# THbookFile

class description - source file - inheritance tree (.ps)

## class THbookFile : public TNamed

| Inheritance Chart:

`TObject`

<-

`TNamed`

<-

`THbookFile`

        public:

                           THbookFile()
                           THbookFile(const char* fname, Int_t lrecl = 1024)
                           THbookFile(const THbookFile&)
                   virtual ~THbookFile()
              virtual void Browse(TBrowser* b)
            virtual Bool_t cd(const char* dirname)
            static TClass* Class()
              virtual void Close(Option_t* option)
          virtual TObject* Convert1D(Int_t id)
          virtual TObject* Convert2D(Int_t id)
            virtual TFile* Convert2root(const char* rootname, Int_t lrecl = 0, Option_t* option)
          virtual TObject* ConvertCWN(Int_t id)
          virtual TObject* ConvertProfile(Int_t id)
          virtual TObject* ConvertRWN(Int_t id)
                      void DeleteID(Int_t id)
          virtual TObject* FindObject(const char* name) const
          virtual TObject* FindObject(const TObject* obj) const
                  TObject* Get(Int_t id)
               const char* GetCurDir() const
                     Int_t GetEntry(Int_t entry, Int_t id, Int_t atype, Float_t* x)
                     Int_t GetEntryBranch(Int_t entry, Int_t id)
                    TList* GetList() const
                    TList* GetListOfKeys() const
                  Long64_t GetSize() const
                      void InitLeaves(Int_t id, Int_t var, TTreeFormula* formula)
           virtual TClass* IsA() const
            virtual Bool_t IsFolder() const
            virtual Bool_t IsOpen() const
              virtual void ls(const char* path) const
               THbookFile& operator=(const THbookFile&)
              virtual void SetBranchAddress(Int_t id, const char* bname, void* add)
              virtual void ShowMembers(TMemberInspector& insp, char* parent)
              virtual void Streamer(TBuffer& b)
                      void StreamerNVirtual(TBuffer& b)

### Data Members

        protected:

                  Int_t fLun       Fortran logical unit for this file
                  Int_t fLrecl     Record length in Hbook machine words
                 TList* fList      list of objects in memory
                 TList* fKeys      list of Hbook keys (Ids) on disk
                TString fCurDir    name of current directory
          static Bool_t fgPawInit
          static Int_t* fgLuns

## Class Description

      This class is an interface to the Hbook objects in Hbook files
      Any Hbook object (1-D, 2-D, Profile, RWN or CWN can be read
      NB: a THbookFile can only be used in READ mode
          Use the utility in $ROOTSYS/bin/h2root to convert Hbook to Root

     Example of use:
      gSystem->Load("libHbook");
      THbookFile f("myfile.hbook");
      f.ls();
      TH1F *h1 = (TH1F*)f.Get(1);  //import histogram ID=1 in h1
      h1->Fit("gaus");
      THbookTree *T = (THbookTree*)f.Get(111); //import ntuple header
      T->Print();  //show the Hbook ntuple variables
      T->Draw("x","y<0"); // as in normal TTree::Draw

      THbookFile can be browsed via TBrowser.

THbookFile() : TNamed()

THbookFile(const char *fname, Int_t lrecl) :TNamed(fname,"")

      Constructor for an HBook file object

~THbookFile()

void Browse(TBrowser *b)

     to be implemented

Bool_t cd(const char *dirname)

     change directory to dirname

void Close(Option_t *)

     Close the Hbook file

void DeleteID(Int_t id)

TObject* FindObject(const char *name) const

     return object with name in fList in memory

TObject* FindObject(const TObject *obj) const

     return object with pointer obj in fList in memory

TObject* Get(Int_t idd)

     import Hbook object with identifier idd in memory

Int_t GetEntry(Int_t entry, Int_t id, Int_t atype, Float_t *x)

     Read in memory all columns of entry number of ntuple id from the Hbook file

Int_t GetEntryBranch(Int_t entry, Int_t id)

     Read in memory only the branch bname

void InitLeaves(Int_t id, Int_t var, TTreeFormula *formula)

     This function is called from the first entry in TTreePlayer::InitLoop
     It analyzes the list of variables involved in the current query
     and pre-process the internal Hbook tables to speed-up the search
     at the next entries.

Bool_t IsOpen() const

     Returns kTRUE in case file is open and kFALSE if file is not open.

void SetBranchAddress(Int_t id, const char *bname, void *add)

TFile* Convert2root(const char *rootname, Int_t /*lrecl*/, Option_t *option)

     Convert this Hbook file to a Root file with name rootname.
     if rootname="', rootname = hbook file name with .root instead of .hbook
     By default, the Root file is connected and returned
     option:
           - "NO" do not connect the Root file
           - "C"  do not compress file (default is to compress)
           - "L"  do not convert names to lower case (default is to convert)

TObject* ConvertCWN(Int_t id)

     Convert the Column-Wise-Ntuple id to a Root Tree

TObject* ConvertRWN(Int_t id)

     Convert the Row-Wise-Ntuple id to a Root Tree

TObject* ConvertProfile(Int_t id)

     Convert an Hbook profile histogram into a Root TProfile

     the following structure is used in Hbook
        lcid points to the profile in array iq
        lcont = lq(lcid-1)
        lw    = lq(lcont)
        ln    = lq(lw)
          if option S jbyt(iq(lw),1,2) = 1
          if option I jbyt(iq(lw),1,2) = 2

TObject* Convert1D(Int_t id)

     Convert an Hbook 1-d histogram into a Root TH1F

TObject* Convert2D(Int_t id)

     Convert an Hbook 2-d histogram into a Root TH2F

void ls(const char *path) const

     List contents of Hbook directory

### Inline Functions

            const char* GetCurDir() const
               Long64_t GetSize() const
                 TList* GetList() const
                 TList* GetListOfKeys() const
                 Bool_t IsFolder() const
                TClass* Class()
                TClass* IsA() const
                   void ShowMembers(TMemberInspector& insp, char* parent)
                   void Streamer(TBuffer& b)
                   void StreamerNVirtual(TBuffer& b)
             THbookFile THbookFile(const THbookFile&)
            THbookFile& operator=(const THbookFile&)

Author: Rene Brun 18/02/2002
Last update: root/hbook:$Name: $:$Id: THbookFile.cxx,v 1.21 2004/02/19 21:48:06 brun Exp $
Copyright (C) 1995-2002, Rene Brun and Fons Rademakers. *