A List of entry numbers in a TTree or TChain.

There are two types of entry lists:

1.

for a TTree (fBlocks data member is non-zero) Entry numbers are stored in TEntryListBlocks, which, in their turn, are stored in the TObjArray fBlocks. The range of the entry numbers is cut into intervals of kBlockSize entries (currently 64000), so that the first block contains information which entries out of the first 64000 pass the selection, the second block - which entries out of the 64000-127999 interval pass the selection, etc. Some blocks, obviously, might be empty. The internal representation of entry numbers in the blocks is described in the TEntryListBlock class description, and this representation might be changed by calling OptimizeStorage() function (when the list is filled via the Enter() function, this is done automatically, except for the last block). Individual entry lists can be merged (functions Merge() and Add()) to make an entry list for a TChain of corresponding TTrees.

2.

for a TChain (fLists data member is non-zero) It contains a TList of sub-lists (TEntryList objects, corresponding to each TTree) Trees and lists are matched by the TTree name and its file name (full path). All sub-lists are returned by the GetLists() function and individual lists are returned by GetEntryList() function. Such lists are no different from the lists for TTrees, described above.

Operations on entry lists

Add() - if the lists are for the same tree, adds all the entries of the second list to the first list. If the lists are for different trees, creates a TEntryList with 2 sublists for each TTree. If the lists are for TChains, merges the ones for the same trees and adds new sublists for the TTrees that were not included in the first TEntryList
Subtract() - if the lists are for the same TTree, removes the entries of the second list from the first list. If the lists are for TChains, loops over all sub-lists
GetEntry(n) - returns the n-th entry number
Next() - returns next entry number. Note, that this function is much faster than GetEntry, and it's called when GetEntry() is called for 2 or more indices in a row.

TTree::Draw() and TChain::Draw()

Use option entrylist to write the results of TTree::Draw and TChain::Draw into an entry list. Example:

tree->Draw(">>elist", "x<0 && y>0", "entrylist");

TEntryList *elist = (TEntryList*)gDirectory->Get("elist");

gDirectory

#define gDirectory

Definition TDirectory.h:385

TEntryList

A List of entry numbers in a TTree or TChain.

Definition TEntryList.h:26

tree

Definition tree.py:1

Example of Loop on TEntryList with a TChain

void loopChain() {
   TFile *fe = TFile::Open("myelist.root");
   TEntryList *myelist = (TEntryList*)fe->Get("myelist");
   TChain *chain = new TChain("ntuple");
   chain->Add("hsimple.root");
   chain->Add("hsimple2.root");
   Long64_t listEntries = myelist->GetN();
   Long64_t chainEntries = chain->GetEntries();
   Int_t treenum = 0;
   chain->SetEntryList(myelist);
 
   for (entry=start;entry < end;entry++) {
      entryNumber = chain->GetEntryNumber(entry);
      if (entryNumber < 0) break;
      localEntry = chain->LoadTree(entryNumber);
      if (localEntry < 0) break;
      ....
      then either call
         branch->GetEntry(localEntry);
      or
         chain->GetEntry(entryNumber);
      In the later case the LoadTree is then somewhat redundant.
      ...
   }
}

When using the TEntryList interface directly, you can get the 'tree number' and entry in the current tree (i.e. value similar to the return value of LoadTree) from calling TEntryList::GetEntryAndTree:

Long64_t treeEntry = myelist->GetEntryAndTree(el,treenum);

TEntryList::GetEntryAndTree

virtual Long64_t GetEntryAndTree(Long64_t index, Int_t &treenum)

Return the index of "index"-th non-zero entry in the TTree or TChain and the # of the corresponding t...

Definition TEntryList.cxx:816

to obtain the entry number within the chain you need to add to it the value of treeEntry+ch->GetTreeOffset()[treenum] such that the loop in the previous example can also be written as:

for (Long64_t el = 0; el < listEntries; el++) {
   Long64_t treeEntry = myelist->GetEntryAndTree(el,treenum);
   Long64_t chainEntry = treeEntry+ch->GetTreeOffset()[treenum];
   printf("el=%lld, treeEntry=%lld, chainEntry=%lld, treenum=%d\n", el, treeEntry, chainEntry, treenum);
 
   ch->LoadTree(chainEntry); // this also returns treeEntry
   needed_branch->GetEntry(treeEntry);
}

TSelectors

To fill an TEntryList from a TSelector correctly, one must add the TEntryList object to the output list of the selector (TSelector::fOutput). This is the only way to make the sub-lists of the TEntryList switch when the current tree of the TChain is changed.

Using a TEntryList as input (TTree::SetEntryList() and TChain::SetEntryList())

while the TTree::SetEntryList() function is only setting the TTree::fEntryList data member, the same function in TChain also finds correspondence between the TTrees of this TChain and the sub-lists of this TEntryList.

TEntryList and the current directory

TEntryList objects are automatically added to the current directory (like TTrees). However, in case of a TEntryList for a chain, only the top-level entry list is added, not the sub-lists for specific trees. Placing entry lists in the current directory allows calling them as a part of a TTreeFormula expression, so if the user wants to extract a sublist from a TChain entry list via the GetEntryList() or some other function, they have to add it to the current directory to be able to use it in TTreeFormula expressions.

TEntryList and TEventList

TTree::SetEventList() and TChain::SetEventList() transform a TEventList into a TEntryList See comments to those functions for more details

Definition at line 25 of file TEntryList.h.

Public Types
enum	{ kBlockSize = 64000 }

Public Types inherited from TObject
enum	{ kIsOnHeap = 0x01000000 , kNotDeleted = 0x02000000 , kZombie = 0x04000000 , kInconsistent = 0x08000000 , kBitMask = 0x00ffffff }

enum	{ kSingleKey = BIT(0) , kOverwrite = BIT(1) , kWriteDelete = BIT(2) }

enum	EDeprecatedStatusBits { kObjInCanvas = BIT(3) }

enum	EStatusBits { kCanDelete = BIT(0) , kMustCleanup = BIT(3) , kIsReferenced = BIT(4) , kHasUUID = BIT(5) , kCannotPick = BIT(6) , kNoContextMenu = BIT(8) , kInvalidObject = BIT(13) }

Public Member Functions
	TEntryList ()
	default c-tor

	TEntryList (const char name, const char title)
	c-tor with name and title

	TEntryList (const char name, const char title, const char treename, const char filename)
	c-tor with name and title, which also sets the treename and the filename

	TEntryList (const char name, const char title, const TTree *tree)
	constructor with name and title, which also sets the tree

	TEntryList (const TEntryList &elist)
	copy c-tor

	TEntryList (const TTree *tree)
	c-tor, which sets the tree

virtual	~TEntryList ()
	Destructor.

virtual void	Add (const TEntryList *elist)
	Add 2 entry lists.

void	AddSubList (TEntryList *elist)
	Add a sub entry list to the current list.

virtual Int_t	Contains (Long64_t entry, TTree *tree=0)

virtual void	DirectoryAutoAdd (TDirectory *)
	Called by TKey and others to automatically add us to a directory when we are read from a file.

virtual Bool_t	Enter (Long64_t entry, TTree *tree=0)
	Add entry #entry to the list.

void	EnterRange (Long64_t start, Long64_t end, TTree *tree=nullptr, UInt_t step=1U)
	Enter all entries in a range in the TEntryList.

virtual TEntryList *	GetCurrentList () const

virtual TDirectory *	GetDirectory () const

virtual Long64_t	GetEntriesToProcess () const

virtual Long64_t	GetEntry (Long64_t index)
	Return the number of the entry #index of this TEntryList in the TTree or TChain See also Next().

virtual Long64_t	GetEntryAndTree (Long64_t index, Int_t &treenum)
	Return the index of "index"-th non-zero entry in the TTree or TChain and the # of the corresponding tree in the chain.

virtual TEntryList *	GetEntryList (const char treename, const char filename, Option_t *opt="")
	Return the entry list, corresponding to treename and filename By default, the filename is first tried as is, and then, if the corresponding list is not found, the filename is expanded to the absolute path, and compared again.

virtual const char *	GetFileName () const

virtual TList *	GetLists () const

virtual Long64_t	GetN () const

virtual Bool_t	GetReapplyCut () const

virtual const char *	GetTreeName () const

virtual Int_t	GetTreeNumber () const

Bool_t	IsValid () const

virtual Int_t	Merge (TCollection *list)
	Merge this list with the lists from the collection.

virtual Long64_t	Next ()
	Return the next non-zero entry index (next after fLastIndexQueried) this function is faster than GetEntry()

virtual void	OptimizeStorage ()
	Checks if the array representation is more economical and if so, switches to it.

virtual void	Print (const Option_t *option="") const
	Print this list.

virtual Int_t	RelocatePaths (const char newloc, const char oldloc=0)
	Relocate the file paths.

virtual Bool_t	Remove (Long64_t entry, TTree *tree=0)
	Remove entry #entry from the list.

virtual void	Reset ()
	Reset this list.

virtual Int_t	ScanPaths (TList *roots, Bool_t notify=kTRUE)
	Scan the paths to find the common roots.

virtual void	SetDirectory (TDirectory *dir)
	Add reference to directory dir. dir can be 0.

virtual void	SetEntriesToProcess (Long64_t nen)

virtual void	SetFileName (const char *filename)

virtual void	SetReapplyCut (Bool_t apply=kFALSE)

virtual void	SetShift (Bool_t shift)

virtual void	SetTree (const char treename, const char filename)
	If a list for a tree with such name and filename exists, sets it as the current sublist If not, creates this list and sets it as the current sublist.

virtual void	SetTree (const TTree *tree)
	If a list for a tree with such name and filename exists, sets it as the current sublist If not, creates this list and sets it as the current sublist The name of the file, where the tree is, is taken as `tree->GetTree()->GetCurrentFile()->GetName()`, and then expanded either to the absolute path, or to full url.

virtual void	SetTreeName (const char *treename)

virtual void	SetTreeNumber (Int_t index)

virtual void	Subtract (const TEntryList *elist)
	Remove all the entries of this entry list, that are contained in elist.

Public Member Functions inherited from TNamed
	TNamed ()

	TNamed (const char name, const char title)

	TNamed (const TNamed &named)
	TNamed copy ctor.

	TNamed (const TString &name, const TString &title)

virtual	~TNamed ()
	TNamed destructor.

virtual void	Clear (Option_t *option="")
	Set name and title to empty strings ("").

virtual TObject *	Clone (const char *newname="") const
	Make a clone of an object using the Streamer facility.

virtual Int_t	Compare (const TObject *obj) const
	Compare two TNamed objects.

virtual void	Copy (TObject &named) const
	Copy this to obj.

virtual void	FillBuffer (char *&buffer)
	Encode TNamed into output buffer.

virtual const char *	GetName () const
	Returns name of object.

virtual const char *	GetTitle () const
	Returns title of object.

virtual ULong_t	Hash () const
	Return hash value for this object.

virtual Bool_t	IsSortable () const

virtual void	ls (Option_t *option="") const
	List TNamed name and title.

TNamed &	operator= (const TNamed &rhs)
	TNamed assignment operator.

virtual void	Print (Option_t *option="") const
	Print TNamed name and title.

virtual void	SetName (const char *name)
	Set the name of the TNamed.

virtual void	SetNameTitle (const char name, const char title)
	Set all the TNamed parameters (name and title).

virtual void	SetTitle (const char *title="")
	Set the title of the TNamed.

virtual Int_t	Sizeof () const
	Return size of the TNamed part of the TObject.

Public Member Functions inherited from TObject
	TObject ()
	TObject constructor.

	TObject (const TObject &object)
	TObject copy ctor.

virtual	~TObject ()
	TObject destructor.

void	AbstractMethod (const char *method) const
	Use this method to implement an "abstract" method that you don't want to leave purely abstract.

virtual void	AppendPad (Option_t *option="")
	Append graphics object to current pad.

virtual void	Browse (TBrowser *b)
	Browse object. May be overridden for another default action.

ULong_t	CheckedHash ()
	Check and record whether this class has a consistent Hash/RecursiveRemove setup (*) and then return the regular Hash value for this object.

virtual const char *	ClassName () const
	Returns name of class to which the object belongs.

virtual void	Delete (Option_t *option="")
	Delete this object.

virtual Int_t	DistancetoPrimitive (Int_t px, Int_t py)
	Computes distance from point (px,py) to the object.

virtual void	Draw (Option_t *option="")
	Default Draw method for all objects.

virtual void	DrawClass () const
	Draw class inheritance tree of the class to which this object belongs.

virtual TObject *	DrawClone (Option_t *option="") const
	Draw a clone of this object in the current selected pad for instance with: `gROOT->SetSelectedPad(gPad)`.

virtual void	Dump () const
	Dump contents of object on stdout.

virtual void	Error (const char method, const char msgfmt,...) const
	Issue error message.

virtual void	Execute (const char method, const char params, Int_t *error=0)
	Execute method on this object with the given parameter string, e.g.

virtual void	Execute (TMethod method, TObjArray params, Int_t *error=0)
	Execute method on this object with parameters stored in the TObjArray.

virtual void	ExecuteEvent (Int_t event, Int_t px, Int_t py)
	Execute action corresponding to an event at (px,py).

virtual void	Fatal (const char method, const char msgfmt,...) const
	Issue fatal error message.

virtual TObject *	FindObject (const char *name) const
	Must be redefined in derived classes.

virtual TObject *	FindObject (const TObject *obj) const
	Must be redefined in derived classes.

virtual Option_t *	GetDrawOption () const
	Get option used by the graphics system to draw this object.

virtual const char *	GetIconName () const
	Returns mime type name of object.

virtual char *	GetObjectInfo (Int_t px, Int_t py) const
	Returns string containing info about the object at position (px,py).

virtual Option_t *	GetOption () const

virtual UInt_t	GetUniqueID () const
	Return the unique object id.

virtual Bool_t	HandleTimer (TTimer *timer)
	Execute action in response of a timer timing out.

Bool_t	HasInconsistentHash () const
	Return true is the type of this object is known to have an inconsistent setup for Hash and RecursiveRemove (i.e.

virtual void	Info (const char method, const char msgfmt,...) const
	Issue info message.

virtual Bool_t	InheritsFrom (const char *classname) const
	Returns kTRUE if object inherits from class "classname".

virtual Bool_t	InheritsFrom (const TClass *cl) const
	Returns kTRUE if object inherits from TClass cl.

virtual void	Inspect () const
	Dump contents of this object in a graphics canvas.

void	InvertBit (UInt_t f)

Bool_t	IsDestructed () const
	IsDestructed.

virtual Bool_t	IsEqual (const TObject *obj) const
	Default equal comparison (objects are equal if they have the same address in memory).

virtual Bool_t	IsFolder () const
	Returns kTRUE in case object contains browsable objects (like containers or lists of other objects).

R__ALWAYS_INLINE Bool_t	IsOnHeap () const

R__ALWAYS_INLINE Bool_t	IsZombie () const

void	MayNotUse (const char *method) const
	Use this method to signal that a method (defined in a base class) may not be called in a derived class (in principle against good design since a child class should not provide less functionality than its parent, however, sometimes it is necessary).

virtual Bool_t	Notify ()
	This method must be overridden to handle object notification.

void	Obsolete (const char method, const char asOfVers, const char *removedFromVers) const
	Use this method to declare a method obsolete.

void	operator delete (void *ptr)
	Operator delete.

void	operator delete[] (void *ptr)
	Operator delete [].

void *	operator new (size_t sz)

void *	operator new (size_t sz, void *vp)

void *	operator new[] (size_t sz)

void *	operator new[] (size_t sz, void *vp)

TObject &	operator= (const TObject &rhs)
	TObject assignment operator.

virtual void	Paint (Option_t *option="")
	This method must be overridden if a class wants to paint itself.

virtual void	Pop ()
	Pop on object drawn in a pad to the top of the display list.

virtual Int_t	Read (const char *name)
	Read contents of object with specified name from the current directory.

virtual void	RecursiveRemove (TObject *obj)
	Recursively remove this object from a list.

void	ResetBit (UInt_t f)

virtual void	SaveAs (const char filename="", Option_t option="") const
	Save this object in the file specified by filename.

virtual void	SavePrimitive (std::ostream &out, Option_t *option="")
	Save a primitive as a C++ statement(s) on output stream "out".

void	SetBit (UInt_t f)

void	SetBit (UInt_t f, Bool_t set)
	Set or unset the user status bits as specified in f.

virtual void	SetDrawOption (Option_t *option="")
	Set drawing option for object.

virtual void	SetUniqueID (UInt_t uid)
	Set the unique object id.

virtual void	SysError (const char method, const char msgfmt,...) const
	Issue system error message.

R__ALWAYS_INLINE Bool_t	TestBit (UInt_t f) const

Int_t	TestBits (UInt_t f) const

virtual void	UseCurrentStyle ()
	Set current style settings in this object This function is called when either TCanvas::UseCurrentStyle or TROOT::ForceStyle have been invoked.

virtual void	Warning (const char method, const char msgfmt,...) const
	Issue warning message.

virtual Int_t	Write (const char *name=0, Int_t option=0, Int_t bufsize=0)
	Write this object to the current directory.

virtual Int_t	Write (const char *name=0, Int_t option=0, Int_t bufsize=0) const
	Write this object to the current directory.

Static Public Member Functions
static Int_t	Relocate (const char fn, const char newroot, const char oldroot=0, const char enlnm=0)
	Relocate entry list 'enlnm' in file 'fn' replacing 'oldroot' with 'newroot' in filenames.

static Int_t	Scan (const char fn, TList roots)
	Scan TEntryList in 'fn' to find the common parts of paths.

Static Public Member Functions inherited from TObject
static Longptr_t	GetDtorOnly ()
	Return destructor only flag.

static Bool_t	GetObjectStat ()
	Get status of object stat flag.

static void	SetDtorOnly (void *obj)
	Set destructor only flag.

static void	SetObjectStat (Bool_t stat)
	Turn on/off tracking of objects in the TObjectTable.

Protected Member Functions
void	GetFileName (const char filename, TString &fn, Bool_t =0)
	To be able to re-localize the entry-list we identify the file by just the name and the anchor, i.e.

Protected Member Functions inherited from TObject
virtual void	DoError (int level, const char location, const char fmt, va_list va) const
	Interface to ErrorHandler (protected).

void	MakeZombie ()

Protected Attributes
TObjArray *	fBlocks
	blocks with indices of passing events (TEntryListBlocks)

TEntryList *	fCurrent
	! currently filled entry list

TDirectory *	fDirectory
	! Pointer to directory holding this tree

Long64_t	fEntriesToProcess
	used on proof to set the number of entries to process in a packet

TString	fFileName
	name of the file, where the tree is

Long64_t	fLastIndexQueried
	! used to optimize GetEntry() function from a loop

Long64_t	fLastIndexReturned
	! used to optimize GetEntry() function from a loop

TList *	fLists
	a list of underlying entry lists for each tree of a chain

Long64_t	fN
	number of entries in the list

Int_t	fNBlocks
	number of TEntryListBlocks

Bool_t	fReapply
	If true, TTree::Draw will 'reapply' the original cut.

Bool_t	fShift
	! true when some sub-lists don't correspond to trees (when the entry list is used as input in TChain)

ULong_t	fStringHash
	! Hash value of a string of treename and filename

TString	fTreeName
	name of the tree

Int_t	fTreeNumber
	! the index of the tree in the chain (used when the entry list is used as input (TTree::SetEntryList())

Protected Attributes inherited from TNamed
TString	fName

TString	fTitle

Private Member Functions
TEntryList &	operator= (const TEntryList &)

Friends
TEntryList	operator\|\| (TEntryList &elist1, TEntryList &elist2)

Additional Inherited Members
Protected Types inherited from TObject
enum	{ kOnlyPrepStep = BIT(3) }

#include <TEntryList.h>

Inheritance diagram for TEntryList:

[legend]

Member Enumeration Documentation

◆ anonymous enum

anonymous enum

Enumerator
kBlockSize

Definition at line 54 of file TEntryList.h.

Constructor & Destructor Documentation

◆ TEntryList() [1/6]

TEntryList::TEntryList ( )

default c-tor

Definition at line 161 of file TEntryList.cxx.

◆ TEntryList() [2/6]

TEntryList::TEntryList	(	const char *	name,
		const char *	title
	)

c-tor with name and title

Definition at line 182 of file TEntryList.cxx.

◆ TEntryList() [3/6]

TEntryList::TEntryList	(	const char *	name,
		const char *	title,
		const TTree *	tree
	)

constructor with name and title, which also sets the tree

Definition at line 208 of file TEntryList.cxx.

◆ TEntryList() [4/6]

TEntryList::TEntryList	(	const char *	name,
		const char *	title,
		const char *	treename,
		const char *	filename
	)

c-tor with name and title, which also sets the treename and the filename

Definition at line 230 of file TEntryList.cxx.

◆ TEntryList() [5/6]

TEntryList::TEntryList ( const TTree * tree )

c-tor, which sets the tree

Definition at line 252 of file TEntryList.cxx.

◆ TEntryList() [6/6]

TEntryList::TEntryList ( const TEntryList & elist )

copy c-tor

Definition at line 275 of file TEntryList.cxx.

◆ ~TEntryList()

TEntryList::~TEntryList ( )

virtual

Destructor.

Definition at line 323 of file TEntryList.cxx.

Member Function Documentation

◆ Add()

void TEntryList::Add ( const TEntryList * elist )

virtual

Add 2 entry lists.

Parameters

[in] elist The list that should be added to the current one.

Note: If you are creating a TEntryList for a TChain and you would like to have a one to one mapping between the sub lists of the TEntryList and the sub trees in the TChain, please do not call this function but use TEntryList::AddSubList instead and pair it with a call to TChain::SetEntryList with option "sync". See the AddSubList function documentation for an example usage. This helps for example in a testing or benchmark scenario where a TChain holds multiple times the same tree in the same file. In that case, this function would not be be able to distinguish different sub entry lists that refer to the same treename and filename. Instead it would create a union of all the sub entry lists into one list.

Reimplemented in TEntryListFromFile, and TEntryListArray.

Definition at line 359 of file TEntryList.cxx.

◆ AddSubList()

void TEntryList::AddSubList ( TEntryList * elist )

Add a sub entry list to the current list.

Parameters

[in] elist an entry list that should be added as a sub list of this list.

This function is specifically targeted at situations where there is a global TEntryList that should hold one or more sub TEntryList objects. For example, if one wants to create a one to one mapping between the sub entry lists and the trees in the files that make a TChain. Note that in such cases this configuration of the entry list should be used in pair with the option "sync" of the function TChain::SetEntryList

// Create a TChain with two files. Each contains a tree with 20 entries
TChain chain{"entries"};
chain.Add("file_20entries_1.root");
chain.Add("file_20entries_2.root");
 
// Create a global, empty TEntryList.
TEntryList elists;
// Create two entry lists. Each one will be referring to a different tree in the chain
TEntryList elist1{"","","entries","file_20entries_1.root"};
TEntryList elist2{"","","entries","file_20entries_2.root"};
 
// Select the first ten entries from the first tree and all entries from the second
for(auto entry = 0; entry < 10; entry++){
    elist1.Enter(entry);
}
for(auto entry = 0; entry < 20; entry++){
    elist2.Enter(entry);
}
 
// Add sub entry lists to the global list
elists.AddSubList(&elist1);
elists.AddSubList(&elist2);
 
// Set the entry list in the chain. Note the usage of option "sync"
chain.SetEntryList(&elists, "sync");

Definition at line 566 of file TEntryList.cxx.

◆ Contains()

Int_t TEntryList::Contains	(	Long64_t	entry,
		TTree *	tree = `0`
	)

virtual

When tree = 0, returns from the current list
When tree != 0, finds the list, corresponding to this tree
When tree is a chain, the entry is assumed to be global index and the local entry is recomputed from the treeoffset information of the chain

Reimplemented in TEntryListArray, and TEntryListFromFile.

Definition at line 584 of file TEntryList.cxx.

◆ DirectoryAutoAdd()

void TEntryList::DirectoryAutoAdd ( TDirectory * dir )

virtual

Called by TKey and others to automatically add us to a directory when we are read from a file.

Definition at line 613 of file TEntryList.cxx.

◆ Enter()

Bool_t TEntryList::Enter	(	Long64_t	entry,
		TTree *	tree = `0`
	)

virtual

Add entry #entry to the list.

When tree = 0, adds to the current list
When tree != 0, finds the list, corresponding to this tree
When tree is a chain, the entry is assumed to be global index and the local entry is recomputed from the treeoffset information of the chain

Reimplemented in TEntryListArray, and TEntryListFromFile.

Definition at line 625 of file TEntryList.cxx.

◆ EnterRange()

void TEntryList::EnterRange	(	Long64_t	start,
		Long64_t	end,
		TTree *	tree = `nullptr`,
		UInt_t	step = `1U`
	)

Enter all entries in a range in the TEntryList.

Parameters

[in]	start	starting entry to enter.
[in]	end	ending entry to enter.
[in]	tree	passed as is to TEntryList::Enter.
[in]	step	step increase of the loop entering the entries.

This is a helper function that enters all entries between start (inclusive) and end (exclusive) to the TEntryList in a loop. It is useful also in PyROOT to avoid having to do the same in a Python loop.

Definition at line 684 of file TEntryList.cxx.

◆ GetCurrentList()

virtual TEntryList * TEntryList::GetCurrentList ( ) const

inlinevirtual

Reimplemented in TEntryListFromFile.

Definition at line 70 of file TEntryList.h.

◆ GetDirectory()

virtual TDirectory * TEntryList::GetDirectory ( ) const

inlinevirtual

Definition at line 76 of file TEntryList.h.

◆ GetEntriesToProcess()

virtual Long64_t TEntryList::GetEntriesToProcess ( ) const

inlinevirtual

Definition at line 74 of file TEntryList.h.

◆ GetEntry()

Long64_t TEntryList::GetEntry ( Long64_t index )

virtual

Return the number of the entry #index of this TEntryList in the TTree or TChain See also Next().

Reimplemented in TEntryListFromFile.

Definition at line 740 of file TEntryList.cxx.

◆ GetEntryAndTree()

Long64_t TEntryList::GetEntryAndTree	(	Long64_t	index,
		Int_t &	treenum
	)

virtual

Return the index of "index"-th non-zero entry in the TTree or TChain and the # of the corresponding tree in the chain.

Reimplemented in TEntryListFromFile.

Definition at line 816 of file TEntryList.cxx.

◆ GetEntryList()

TEntryList * TEntryList::GetEntryList	(	const char *	treename,
		const char *	filename,
		Option_t *	opt = `""`
	)

virtual

Return the entry list, corresponding to treename and filename By default, the filename is first tried as is, and then, if the corresponding list is not found, the filename is expanded to the absolute path, and compared again.

To avoid it, use option "ne"

Reimplemented in TEntryListFromFile.

Definition at line 870 of file TEntryList.cxx.

◆ GetFileName() [1/2]

virtual const char * TEntryList::GetFileName ( ) const

inlinevirtual

Reimplemented in TEntryListFromFile.

Definition at line 79 of file TEntryList.h.

◆ GetFileName() [2/2]

void TEntryList::GetFileName	(	const char *	filename,
		TString &	fn,
		Bool_t *	local = `0`
	)

protected

To be able to re-localize the entry-list we identify the file by just the name and the anchor, i.e.

we drop protocol, host, options, ... The result in the form 'file::anchor' (or 'file', if no anchor is present) is saved in 'fn'. The function optionally (is 'local' is defined) checks file locality (i.e. protocol 'file://') returning the result in '*local' .

Definition at line 851 of file TEntryList.cxx.

◆ GetLists()

virtual TList * TEntryList::GetLists ( ) const

inlinevirtual

Definition at line 75 of file TEntryList.h.

◆ GetN()

virtual Long64_t TEntryList::GetN ( ) const

inlinevirtual

Reimplemented in TEntryListFromFile.

Definition at line 77 of file TEntryList.h.

◆ GetReapplyCut()

virtual Bool_t TEntryList::GetReapplyCut ( ) const

inlinevirtual

Definition at line 81 of file TEntryList.h.

◆ GetTreeName()

virtual const char * TEntryList::GetTreeName ( ) const

inlinevirtual

Reimplemented in TEntryListFromFile.

Definition at line 78 of file TEntryList.h.

◆ GetTreeNumber()

virtual Int_t TEntryList::GetTreeNumber ( ) const

inlinevirtual

Reimplemented in TEntryListFromFile.

Definition at line 80 of file TEntryList.h.

◆ IsValid()

Bool_t TEntryList::IsValid ( ) const

inline

Definition at line 83 of file TEntryList.h.

◆ Merge()

Int_t TEntryList::Merge ( TCollection * list )

virtual

Merge this list with the lists from the collection.

Reimplemented in TEntryListFromFile.

Definition at line 960 of file TEntryList.cxx.

◆ Next()

Long64_t TEntryList::Next ( )

virtual

Return the next non-zero entry index (next after fLastIndexQueried) this function is faster than GetEntry()

Reimplemented in TEntryListFromFile.

Definition at line 979 of file TEntryList.cxx.

◆ operator=()

TEntryList & TEntryList::operator= ( const TEntryList & )

private

◆ OptimizeStorage()

void TEntryList::OptimizeStorage ( )

virtual

Checks if the array representation is more economical and if so, switches to it.

Reimplemented in TEntryListFromFile.

Definition at line 1066 of file TEntryList.cxx.

◆ Print()

void TEntryList::Print ( const Option_t * option = "" ) const

virtual

Print this list.

option = "" - default - print the name of the tree and file
option = "all" - print all the entry numbers

Reimplemented in TEntryListArray, and TEntryListFromFile.

Definition at line 1082 of file TEntryList.cxx.

◆ Relocate()

Int_t TEntryList::Relocate	(	const char *	fn,
		const char *	newroot,
		const char *	oldroot = `0`,
		const char *	enlnm = `0`
	)

static

Relocate entry list 'enlnm' in file 'fn' replacing 'oldroot' with 'newroot' in filenames.

If 'enlnm' is null or '*' all entry lists in the file are relocated. Relocation is mandatory to use the entry-list with the same dataset at a different location (i.e. on a different cluster, machine or disks). This function can be called as many times as need to reach the desired result. The existing 'locations' can be checked qith TEntryList::Scan .

Definition at line 1446 of file TEntryList.cxx.

◆ RelocatePaths()

Int_t TEntryList::RelocatePaths	(	const char *	newroot,
		const char *	oldroot = `0`
	)

virtual

Relocate the file paths.

If oldroot is defined, replace oldroot with newroot in all file names, i.e. oldroot/re/st/of/the/path will become newroot/re/st/of/the/path. Ifoldrootis null, the new path will be justnewroot/path`. Relocation is mandatory to use the entry-list with the same dataset at a different location (i.e. on a different cluster, machine or disks).

Definition at line 1387 of file TEntryList.cxx.

◆ Remove()

Bool_t TEntryList::Remove	(	Long64_t	entry,
		TTree *	tree = `0`
	)

virtual

Remove entry #entry from the list.

When tree = 0, removes from the current list
When tree != 0, finds the list, corresponding to this tree
When tree is a chain, the entry is assumed to be global index and the local entry is recomputed from the treeoffset information of the chain

Reimplemented in TEntryListArray, and TEntryListFromFile.

Definition at line 698 of file TEntryList.cxx.

◆ Reset()

void TEntryList::Reset ( )

virtual

Reset this list.

Reimplemented in TEntryListArray.

Definition at line 1119 of file TEntryList.cxx.

◆ Scan()

Int_t TEntryList::Scan	(	const char *	fn,
		TList *	roots
	)

static

Scan TEntryList in 'fn' to find the common parts of paths.

If 'roots' is defined, add the found roots to the list as TObjStrings. Return the number of common root paths found.

Definition at line 1589 of file TEntryList.cxx.

◆ ScanPaths()

Int_t TEntryList::ScanPaths	(	TList *	roots,
		Bool_t	notify = `kTRUE`
	)

virtual

Scan the paths to find the common roots.

If 'roots' is defined, add the found roots to the list as TObjStrings. Return the number of roots found.

Definition at line 1532 of file TEntryList.cxx.

◆ SetDirectory()

void TEntryList::SetDirectory ( TDirectory * dir )

virtual

Add reference to directory dir. dir can be 0.

Definition at line 1151 of file TEntryList.cxx.

◆ SetEntriesToProcess()

virtual void TEntryList::SetEntriesToProcess ( Long64_t nen )

inlinevirtual

Definition at line 100 of file TEntryList.h.

◆ SetFileName()

virtual void TEntryList::SetFileName ( const char * filename )

inlinevirtual

Definition at line 105 of file TEntryList.h.

◆ SetReapplyCut()

virtual void TEntryList::SetReapplyCut ( Bool_t apply = kFALSE )

inlinevirtual

Definition at line 107 of file TEntryList.h.

◆ SetShift()

virtual void TEntryList::SetShift ( Bool_t shift )

inlinevirtual

Definition at line 101 of file TEntryList.h.

◆ SetTree() [1/2]

void TEntryList::SetTree	(	const char *	treename,
		const char *	filename
	)

virtual

If a list for a tree with such name and filename exists, sets it as the current sublist If not, creates this list and sets it as the current sublist.

! the filename is taken as provided, no extensions to full path or url !

Reimplemented in TEntryListFromFile, and TEntryListArray.

Definition at line 1165 of file TEntryList.cxx.

◆ SetTree() [2/2]

void TEntryList::SetTree ( const TTree * tree )

virtual

If a list for a tree with such name and filename exists, sets it as the current sublist If not, creates this list and sets it as the current sublist The name of the file, where the tree is, is taken as tree->GetTree()->GetCurrentFile()->GetName(), and then expanded either to the absolute path, or to full url.

If, for some reason, you want to provide the filename in a different format, use SetTree(const char *treename, const char *filename), where the filename is taken "as is".

Reimplemented in TEntryListFromFile, and TEntryListArray.

Definition at line 1277 of file TEntryList.cxx.

◆ SetTreeName()

virtual void TEntryList::SetTreeName ( const char * treename )

inlinevirtual

Definition at line 104 of file TEntryList.h.

◆ SetTreeNumber()

virtual void TEntryList::SetTreeNumber ( Int_t index )

inlinevirtual

Reimplemented in TEntryListFromFile.

Definition at line 106 of file TEntryList.h.

◆ Subtract()

void TEntryList::Subtract ( const TEntryList * elist )

virtual

Remove all the entries of this entry list, that are contained in elist.

Reimplemented in TEntryListFromFile, and TEntryListArray.

Definition at line 1313 of file TEntryList.cxx.

Friends And Related Symbol Documentation

◆ operator||

TEntryList operator\|\|	(	TEntryList &	elist1,
		TEntryList &	elist2
	)

friend

Definition at line 1366 of file TEntryList.cxx.

Member Data Documentation

◆ fBlocks

TObjArray* TEntryList::fBlocks

protected

blocks with indices of passing events (TEntryListBlocks)

Definition at line 35 of file TEntryList.h.

◆ fCurrent

TEntryList* TEntryList::fCurrent

protected

! currently filled entry list

Definition at line 32 of file TEntryList.h.

◆ fDirectory

TDirectory* TEntryList::fDirectory

protected

! Pointer to directory holding this tree

Definition at line 48 of file TEntryList.h.

◆ fEntriesToProcess

Long64_t TEntryList::fEntriesToProcess

protected

used on proof to set the number of entries to process in a packet

Definition at line 37 of file TEntryList.h.

◆ fFileName

TString TEntryList::fFileName

protected

name of the file, where the tree is

Definition at line 39 of file TEntryList.h.

◆ fLastIndexQueried

Long64_t TEntryList::fLastIndexQueried

protected

! used to optimize GetEntry() function from a loop

Definition at line 44 of file TEntryList.h.

◆ fLastIndexReturned

Long64_t TEntryList::fLastIndexReturned

protected

! used to optimize GetEntry() function from a loop

Definition at line 45 of file TEntryList.h.

◆ fLists

TList* TEntryList::fLists

protected

a list of underlying entry lists for each tree of a chain

Definition at line 31 of file TEntryList.h.

◆ fN

Long64_t TEntryList::fN

protected

number of entries in the list

Definition at line 36 of file TEntryList.h.

◆ fNBlocks

Int_t TEntryList::fNBlocks

protected

number of TEntryListBlocks

Definition at line 34 of file TEntryList.h.

◆ fReapply

Bool_t TEntryList::fReapply

protected

If true, TTree::Draw will 'reapply' the original cut.

Definition at line 49 of file TEntryList.h.

◆ fShift

Bool_t TEntryList::fShift

protected

! true when some sub-lists don't correspond to trees (when the entry list is used as input in TChain)

Definition at line 46 of file TEntryList.h.

◆ fStringHash

ULong_t TEntryList::fStringHash

protected

! Hash value of a string of treename and filename

Definition at line 40 of file TEntryList.h.

◆ fTreeName

TString TEntryList::fTreeName

protected

name of the tree

Definition at line 38 of file TEntryList.h.

◆ fTreeNumber

Int_t TEntryList::fTreeNumber

protected

! the index of the tree in the chain (used when the entry list is used as input (TTree::SetEntryList())

Definition at line 41 of file TEntryList.h.

Libraries for TEntryList:

[legend]

The documentation for this class was generated from the following files:

tree/tree/inc/TEntryList.h
tree/tree/src/TEntryList.cxx

1.

2.

Operations on entry lists

TTree::Draw() and TChain::Draw()

Example of Loop on TEntryList with a TChain

TSelectors

Using a TEntryList as input (TTree::SetEntryList() and TChain::SetEntryList())

TEntryList and the current directory

TEntryList and TEventList

Public Types

Public Member Functions

Static Public Member Functions

Protected Member Functions

Protected Attributes

Private Member Functions

Friends

Additional Inherited Members

Member Enumeration Documentation

◆ anonymous enum

Constructor & Destructor Documentation

◆ TEntryList() [1/6]

◆ TEntryList() [2/6]

◆ TEntryList() [3/6]

◆ TEntryList() [4/6]

◆ TEntryList() [5/6]

◆ TEntryList() [6/6]

◆ ~TEntryList()

Member Function Documentation

◆ Add()

◆ AddSubList()

◆ Contains()

◆ DirectoryAutoAdd()

◆ Enter()

◆ EnterRange()

◆ GetCurrentList()

◆ GetDirectory()

◆ GetEntriesToProcess()

◆ GetEntry()

◆ GetEntryAndTree()

◆ GetEntryList()

◆ GetFileName() [1/2]

◆ GetFileName() [2/2]

◆ GetLists()

◆ GetN()

◆ GetReapplyCut()

◆ GetTreeName()

◆ GetTreeNumber()

◆ IsValid()

◆ Merge()

◆ Next()

◆ operator=()

◆ OptimizeStorage()

◆ Print()

◆ Relocate()

◆ RelocatePaths()

◆ Remove()

◆ Reset()

◆ Scan()

◆ ScanPaths()

◆ SetDirectory()

◆ SetEntriesToProcess()

◆ SetFileName()

◆ SetReapplyCut()

◆ SetShift()

◆ SetTree() [1/2]

◆ SetTree() [2/2]

◆ SetTreeName()

◆ SetTreeNumber()

◆ Subtract()

Friends And Related Symbol Documentation

◆ operator||

Member Data Documentation

◆ fBlocks

◆ fCurrent

◆ fDirectory

◆ fEntriesToProcess

◆ fFileName

◆ fLastIndexQueried

◆ fLastIndexReturned

◆ fLists