/usr/include/root/TFileIter.h is in libroot-misc-table-dev 5.34.19+dfsg-1.2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// Author: Valery Fine(fine@bnl.gov) 01/03/2001
/*************************************************************************
* Copyright (C) 1995-2004, Rene Brun and Fons Rademakers. *
* Copyright (C) 2001 [BNL] Brookhaven National Laboratory. *
* All rights reserved. *
* *
* For the licensing terms see $ROOTSYS/LICENSE. *
* For the list of contributors see $ROOTSYS/README/CREDITS. *
*************************************************************************/
#ifndef ROOT_TFileIter
#define ROOT_TFileIter
///////////////////////////////////////////////////////////////////////////
// //
// Class to iterate (read / write ) the events written to /from TFile. //
// //
// - set the current internal cursor directly by different means //
// - set the current cursor to the "next" position if available //
// - gain extra information of the TKey object at the current position //
// - read TObject object from the TFile defined by TKey at the current //
// position //
// //
// - Read "next" object from the file //
// - n-th object from the file //
// - object that is in n object on the file //
// - read current object //
// - return the name of the key of the current object //
// - return the current position //
// - set the current position by the absolute position number //
// - set the current position by relative position number //
// - get the number of keys in the file //
// //
// The event is supposed to assign an unique ID in form of //
// //
// TKey name ::= event Id ::= eventName "." run_number "." event_number //
// //
// //
// and stored as the TKey name of the object written //
// //
// author Valeri Fine //
// //
///////////////////////////////////////////////////////////////////////////
#ifndef ROOT_TString
#include "TString.h"
#endif
#ifndef ROOT_TIterator
#include "TIterator.h"
#endif
#ifndef ROOT_TList
#include "TList.h"
#endif
#ifndef ROOT_TFile
#include "TFile.h"
#endif
class TFileIter : public TListIter {
private:
TFileIter *fNestedIterator; //! The inner TFidrectory interator;
virtual TIterator &operator=(const TIterator &) { return *this; }
virtual Bool_t operator!=(const TIterator &it) const { return TListIter::operator!=(it);}
protected:
TDirectory *fRootFile; // TDirectory/TFile to be iterated over
TString fEventName; // current key name
UInt_t fRunNumber; // current "run number"
UInt_t fEventNumber; // current "event number"
Int_t fCursorPosition; // the position of the current key in the sorted TKey list
Bool_t fOwnTFile; // Bit whether this classs creates TFile on its own to delete
void Initialize();
TObject *ReadObj(const TKey *key) const;
TKey *NextEventKey(UInt_t eventNumber=UInt_t(-1), UInt_t runNumber=UInt_t(-1), const char *name="*");
public:
TFileIter(const char *name, Option_t *option = "",
const char *ftitle = "", Int_t compress = 1,
Int_t netopt = 0);
TFileIter(TFile *file=0);
TFileIter(TDirectory *directory);
TFileIter(const TFileIter &);
virtual ~TFileIter();
// --- draft !!! virtual Int_t Copy(TFile *destFile);
Int_t CurrentCursorPosition() const;
virtual const TFile *GetTFile() const;
virtual const TDirectory *GetTDirectory() const;
static TString MapName(const char *name, const char *localSystemKey = 0
, const char *mountedFileSystemKey = 0);
static const char *GetResourceName();
static const char *GetDefaultMapFileName();
static const char *GetLocalFileNameKey();
static const char *GetForeignFileSystemKey();
static void PurgeKeys(TList *listOfKeys);
virtual Bool_t IsOpen() const;
virtual TObject *NextEventGet(UInt_t eventNumber=UInt_t(-1), UInt_t runNumber=UInt_t(-1), const char *name="*");
virtual Int_t NextEventPut(TObject *obj, UInt_t eventNum, UInt_t runNumber, const char *name=0);
void SetCursorPosition(Int_t cursorPosition);
void SetCursorPosition(const char *keyNameToFind);
Int_t GetObjlen() const;
virtual Int_t TotalKeys() const;
virtual TKey *SkipObjects(Int_t nSkip=1);
virtual TObject *GetObject() const;
virtual Int_t GetDepth() const;
TKey *GetCurrentKey() const;
const char *GetKeyName() const;
TFileIter &operator=(Int_t cursorPosition);
TFileIter &operator=(const char *keyNameToFind);
TFileIter &operator+=(Int_t shift);
TFileIter &operator-=(Int_t shift);
TFileIter &operator++();
TFileIter &operator--();
TObject *operator*() const;
operator const char *() const;
operator const TFile *() const;
operator const TDirectory *() const;
operator int () const;
int operator==(const char *name) const;
int operator!=(const char *name) const;
public: // abstract TIterator methods implementations:
virtual TObject *Next();
virtual TObject *Next(Int_t nSkip);
virtual void Reset();
virtual void Rewind();
TObject *operator()(Int_t nSkip);
TObject *operator()();
ClassDef(TFileIter,0) // TFile class iterator
};
//__________________________________________________________________________
inline const char *TFileIter::GetResourceName() {return "ForeignFileMap";}
//__________________________________________________________________________
inline const char *TFileIter::GetDefaultMapFileName() {return "io.config";}
//__________________________________________________________________________
inline const char *TFileIter::GetLocalFileNameKey() {return "LocalFileSystem";}
//__________________________________________________________________________
inline const char *TFileIter::GetForeignFileSystemKey(){return "MountedFileSystem";}
//__________________________________________________________________________
inline Int_t TFileIter::CurrentCursorPosition() const
{
// return the current
return fNestedIterator ? fNestedIterator->CurrentCursorPosition() : fCursorPosition;
}
//__________________________________________________________________________
inline const TFile *TFileIter::GetTFile() const { return GetTDirectory()->GetFile(); }
//__________________________________________________________________________
inline const TDirectory *TFileIter::GetTDirectory() const
{ return fNestedIterator ? fNestedIterator->GetTDirectory() : fRootFile; }
//__________________________________________________________________________
inline TObject *TFileIter::Next()
{
// Make 1 step over the file objects and returns its pointer
// or 0, if there is no object left in the container
return Next(1);
}
//__________________________________________________________________________
inline void TFileIter::Rewind()
{
// Alias for "Reset" method
Reset();
}
//__________________________________________________________________________
inline void TFileIter::SetCursorPosition(Int_t cursorPosition)
{
// Make <cursorPosition> steps (>0 - forward) over the file
// objects to skip it
if (fNestedIterator)
fNestedIterator->SetCursorPosition(cursorPosition);
else
SkipObjects(cursorPosition - fCursorPosition);
}
//__________________________________________________________________________
inline TFileIter &TFileIter::operator=(const char *keyNameToFind)
{
// Iterate unless the name of the object matches <keyNameToFind>
SetCursorPosition(keyNameToFind); return *this;}
//__________________________________________________________________________
inline TFileIter &TFileIter::operator=(Int_t cursorPosition)
{
// Iterate over <cursorPosition>
SetCursorPosition(cursorPosition);
return *this;
}
//__________________________________________________________________________
inline TFileIter::operator const TDirectory *() const
{ return GetTDirectory(); }
//__________________________________________________________________________
inline TFileIter::operator const TFile *() const
{ return GetTFile (); }
//__________________________________________________________________________
inline TFileIter &TFileIter::operator+=(Int_t shift)
{ SkipObjects(shift); return *this;}
//__________________________________________________________________________
inline TFileIter &TFileIter::operator-=(Int_t shift)
{ return operator+=(-shift);}
//__________________________________________________________________________
inline TFileIter &TFileIter::operator++()
{ SkipObjects( 1); return *this;}
//__________________________________________________________________________
inline TFileIter &TFileIter::operator--()
{ SkipObjects(-1); return *this;}
//__________________________________________________________________________
inline TObject *TFileIter::operator*() const
{ return GetObject();}
//__________________________________________________________________________
inline TFileIter::operator int () const
{ return CurrentCursorPosition(); }
//__________________________________________________________________________
inline TFileIter::operator const char *() const
{
// return the current key name
return GetKeyName();
}
//__________________________________________________________________________
inline int TFileIter::operator==(const char *name) const
{ return name ? !strcmp(name,GetKeyName()):0;}
//__________________________________________________________________________
inline int TFileIter::operator!=(const char *name) const
{ return !(operator==(name)); }
//__________________________________________________________________________
inline TObject *TFileIter::operator()(){ return Next(); }
//__________________________________________________________________________
inline TObject *TFileIter::operator()(Int_t nSkip){ return Next(nSkip);}
#endif
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