A TSelector object is used by the TTree::Draw, TTree::Scan, TTree::Process to navigate in a TTree and make selections.

It contains the following main methods:

void TSelector::Init(TTree *t). Called every time a new TTree is attached.
void TSelector::SlaveBegin(). Create e.g. histograms in this method. This method is called (with or without PROOF) before looping on the entries in the Tree. When using PROOF, this method is called on each worker node.
void TSelector::Begin(). Mostly for backward compatibility; use SlaveBegin() instead. Both methods are called before looping on the entries in the Tree. When using PROOF, Begin() is called on the client only.
Bool_t TSelector::Notify(). This method is called at the first entry of a new file in a chain.
Bool_t TSelector::Process(Long64_t entry). This method is called to process an entry. It is the user's responsability to read the corresponding entry in memory (may be just a partial read). Once the entry is in memory one can apply a selection and if the entry is selected histograms can be filled. Processing stops when this function returns kFALSE. This function combines the next two functions in one, avoiding to have to maintain state in the class to communicate between these two functions. See WARNING below about entry. This method is used by PROOF.
Bool_t TSelector::ProcessCut(Long64_t entry). This method is called before processing entry. It is the user's responsability to read the corresponding entry in memory (may be just a partial read). The function returns kTRUE if the entry must be processed, kFALSE otherwise. This method is obsolete, use Process(). See WARNING below about entry.
void TSelector::ProcessFill(Long64_t entry). This method is called for all selected entries. User fills histograms in this function. This method is obsolete, use Process(). See WARNING below about entry.
void TSelector::SlaveTerminate(). This method is called at the end of the loop on all PROOF worker nodes. In local mode this method is called on the client too.
void TSelector::Terminate(). This method is called at the end of the loop on all entries. When using PROOF Terminate() is call on the client only. Typically one performs the fits on the produced histograms or write the histograms to file in this method.

WARNING when a selector is used with a TChain:

in the Process, ProcessCut, ProcessFill function, you must use the pointer to the current Tree to call GetEntry(entry). entry is always the local entry number in the current tree. Assuming that fChain is the pointer to the TChain being processed, use fChain->GetTree()->GetEntry(entry);

Definition at line 39 of file TSelector.h.

Public Types
enum	EAbort { kContinue, kAbortProcess, kAbortFile }

Public Types inherited from TObject
enum	EStatusBits { kCanDelete = BIT(0), kMustCleanup = BIT(3), kObjInCanvas = BIT(3), kIsReferenced = BIT(4), kHasUUID = BIT(5), kCannotPick = BIT(6), kNoContextMenu = BIT(8), kInvalidObject = BIT(13) }

enum	{ kIsOnHeap = 0x01000000, kNotDeleted = 0x02000000, kZombie = 0x04000000, kBitMask = 0x00ffffff }

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

Public Member Functions
	TSelector ()

virtual	~TSelector ()
	Selector destructor. More...

virtual int	Version () const

virtual void	Init (TTree *)

virtual void	Begin (TTree *)

virtual void	SlaveBegin (TTree *)

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

virtual const char *	GetOption () const

virtual Long64_t	GetStatus () const

virtual Int_t	GetEntry (Long64_t, Int_t=0)

virtual Bool_t	ProcessCut (Long64_t)

virtual void	ProcessFill (Long64_t)

virtual Bool_t	Process (Long64_t)

virtual void	SetOption (const char *option)

virtual void	SetObject (TObject *obj)

virtual void	SetInputList (TList *input)

virtual void	SetStatus (Long64_t status)

virtual TList *	GetInputList () const

virtual TList *	GetOutputList () const

virtual void	SlaveTerminate ()

virtual void	Terminate ()

virtual void	Abort (const char *why, EAbort what=kAbortProcess)
	Abort processing. More...

virtual EAbort	GetAbort () const

virtual void	ResetAbort ()

Public Member Functions inherited from TObject
	TObject ()

	TObject (const TObject &object)
	TObject copy ctor. More...

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

virtual	~TObject ()
	TObject destructor. More...

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

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

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

virtual void	Clear (Option_t *="")

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

virtual Int_t	Compare (const TObject *obj) const
	Compare abstract method. More...

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

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

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

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

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

virtual TObject *	DrawClone (Option_t *option="") const
	Draw a clone of this object in the current pad. More...

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

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. More...

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

virtual Bool_t	IsSortable () const

Bool_t	IsOnHeap () const

Bool_t	IsZombie () const

virtual void	ls (Option_t *option="") const
	The ls function lists the contents of a class on stdout. More...

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

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

virtual void	Print (Option_t *option="") const
	This method must be overridden when a class wants to print itself. More...

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

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

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

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

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

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

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

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

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

void *	operator new (size_t sz)

void *	operator new[] (size_t sz)

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

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

void	operator delete (void *ptr)
	Operator delete. More...

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

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

void	SetBit (UInt_t f)

void	ResetBit (UInt_t f)

Bool_t	TestBit (UInt_t f) const

Int_t	TestBits (UInt_t f) const

void	InvertBit (UInt_t f)

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

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

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

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

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

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

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). More...

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

Static Public Member Functions
static TSelector *	GetSelector (const char *filename)
	The code in filename is loaded (interpreted or compiled, see below), filename must contain a valid class implementation derived from TSelector. More...

static Bool_t	IsStandardDraw (const char *selec)
	Find out if this is a standard selection used for Draw actions (either TSelectorDraw, TProofDraw or deriving from them). More...

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

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

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

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

Protected Attributes
Long64_t	fStatus

EAbort	fAbort

TString	fOption

TObject *	fObject

TList *	fInput
	Current object if processing object (vs. TTree) More...

TSelectorList *	fOutput

Private Member Functions
	TSelector (const TSelector &)
	List of objects created during processing. More...

TSelector &	operator= (const TSelector &)

Additional Inherited Members
Protected Member Functions inherited from TObject
void	MakeZombie ()

virtual void	DoError (int level, const char location, const char fmt, va_list va) const
	Interface to ErrorHandler (protected). More...

#include <TSelector.h>

Inheritance diagram for TSelector:

Collaboration diagram for TSelector:

Member Enumeration Documentation

enum TSelector::EAbort

Enumerator
kContinue
kAbortProcess
kAbortFile

Definition at line 42 of file TSelector.h.

Constructor & Destructor Documentation

TSelector::TSelector ( const TSelector & )

private

List of objects created during processing.

TSelector::TSelector ( )

TSelector::~TSelector ( )

virtual

Selector destructor.

Definition at line 100 of file TSelector.cxx.

Member Function Documentation

void TSelector::Abort	(	const char *	why,
		EAbort	what = `kAbortProcess`
	)

virtual

Abort processing.

If what = kAbortProcess, the Process() loop will be aborted. If what = kAbortFile, the current file in a chain will be aborted and the processing will continue with the next file, if there is no next file then Process() will be aborted. Abort() can also be called from Begin(), SlaveBegin(), Init() and Notify(). After abort the SlaveTerminate() and Terminate() are always called. The abort flag can be checked in these methods using GetAbort().

Reimplemented in TSelectorCint, and TPySelector.

Definition at line 114 of file TSelector.cxx.

Referenced by TPySelector::Abort(), TSelectorDraw::Begin(), and TSelVerifyDataSet::SlaveBegin().

virtual void TSelector::Begin ( TTree * )

inlinevirtual

Reimplemented in TProofDrawProfile2D, TProofDrawProfile, TProofDrawHist, TSelEvent, TProofDraw, TSelVerifyDataSet, TSelectorDraw, TSelEventGen, TSelectorCint, TPySelector, TSelHist, TSelHandleDataSet, and TSelectorEntries.

Definition at line 62 of file TSelector.h.

Referenced by TProofPlayerLite::Process(), and TTreePlayer::Process().

virtual EAbort TSelector::GetAbort ( ) const

inlinevirtual

Reimplemented in TSelectorCint.

Definition at line 80 of file TSelector.h.

Referenced by TEventIterTree::GetNextEvent(), TEventIterTree::GetNextPacket(), and TTreePlayer::Process().

virtual Int_t TSelector::GetEntry	(	Long64_t	,
		Int_t	= `0`
	)

inlinevirtual

Reimplemented in TSelectorEntries, TPySelector, and RooProofDriverSelector.

Definition at line 67 of file TSelector.h.

virtual TList* TSelector::GetInputList ( ) const

inlinevirtual

Definition at line 75 of file TSelector.h.

Referenced by TProofPlayerLite::Process().

virtual const char* TSelector::GetOption ( ) const

inlinevirtual

Reimplemented from TObject.

Definition at line 65 of file TSelector.h.

Referenced by TSelectorEntries::Begin(), TSelHist::Begin(), TSelEventGen::Begin(), TSelectorDraw::Begin(), TSelEvent::Begin(), TSelectorEntries::SlaveBegin(), TSelHist::SlaveBegin(), TSelEventGen::SlaveBegin(), and TSelEvent::SlaveBegin().

virtual TList* TSelector::GetOutputList ( ) const

inlinevirtual

Reimplemented in TSelEvent, TSelVerifyDataSet, TSelectorCint, TSelEventGen, TSelHist, TSelHandleDataSet, TSelectorEntries, and RooProofDriverSelector.

Definition at line 76 of file TSelector.h.

Referenced by TProofPlayerLite::Finalize(), TEventIterTree::GetNextEvent(), TEventIterTree::GetNextPacket(), TOutputListSelectorDataMap::Init(), TSessionQueryFrame::OnBtnRetrieve(), TProofPlayerLite::Process(), and TOutputListSelectorDataMap::SetDataMembers().

TSelector * TSelector::GetSelector ( const char * filename )

static

The code in filename is loaded (interpreted or compiled, see below), filename must contain a valid class implementation derived from TSelector.

If filename is of the form file.C, the file will be interpreted. If filename is of the form file.C++, the file file.C will be compiled and dynamically loaded. The corresponding binary file and shared library will be deleted at the end of the function. If filename is of the form file.C+, the file file.C will be compiled and dynamically loaded. At next call, if file.C is older than file.o and file.so, the file.C is not compiled, only file.so is loaded.

The static function returns a pointer to a TSelector object

Definition at line 140 of file TSelector.cxx.

Referenced by TProofPlayer::AssertSelector(), TProofLite::CopyMacroToCache(), TProofPlayerLite::MakeSelector(), TTreePlayer::Process(), TProofPlayerRemote::Process(), and TProofPlayer::ReinitSelector().