library: libTreePlayer #include "TTreeFormula.h"

# TTreeFormula

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

## class TTreeFormula : public TFormula

| Inheritance Chart:

`TObject`

<-

`TNamed`

<-

`TFormula`

<-

`TTreeFormula`

        private:

                        TTreeFormula(const TTreeFormula&)
          TTreeFormula& operator=(const TTreeFormula&)

        protected:

                    Bool_t BranchHasMethod(TLeaf* leaf, TBranch* branch, const char* method, const char* params, UInt_t readentry) const
              virtual void Convert(UInt_t fromVersion)
                      void DefineDimensions(Int_t code, Int_t size, TFormLeafInfoMultiVarDim* info, Int_t& virt_dim)
                    TLeaf* GetLeafWithDatamember(const char* topchoice, const char* nextchice, UInt_t readentry) const
                     Int_t GetRealInstance(Int_t instance, Int_t codeindex)
          virtual Double_t GetValueFromMethod(Int_t i, TLeaf* leaf) const
             virtual void* GetValuePointerFromMethod(Int_t i, TLeaf* leaf) const
            virtual Bool_t IsLeafInteger(Int_t code) const
            virtual Bool_t IsLeafString(Int_t code) const
            virtual Bool_t IsString(Int_t oper) const
                    Bool_t LoadCurrentDim()
                     Int_t RegisterDimensions(Int_t code, Int_t size, TFormLeafInfoMultiVarDim* multidim = 0)
                     Int_t RegisterDimensions(Int_t code, TBranchElement* branch)
                     Int_t RegisterDimensions(Int_t code, TFormLeafInfo* info)
                     Int_t RegisterDimensions(Int_t code, TLeaf* leaf)
                     Int_t RegisterDimensions(const char* size, Int_t code)
                      void ResetDimensions()

        public:

                               TTreeFormula()
                               TTreeFormula(const char* name, const char* formula, TTree* tree)
                       virtual ~TTreeFormula()
                static TClass* Class()
                 virtual Int_t DefinedVariable(TString& variable, Int_t& action)
               virtual TClass* EvalClass() const
              virtual Double_t EvalInstance(Int_t i = 0, const char** stringStack = "0")
                 virtual void* EvalObject(Int_t i = 0)
           virtual const char* EvalStringInstance(Int_t i = 0) const
                virtual TLeaf* GetLeaf(Int_t n) const
                TFormLeafInfo* GetLeafInfo(Int_t code) const
          TTreeFormulaManager* GetManager() const
                  TMethodCall* GetMethodCall(Int_t code) const
                 virtual Int_t GetMultiplicity() const
                 virtual Int_t GetNcodes() const
                 virtual Int_t GetNdata()
               virtual TClass* IsA() const
                virtual Bool_t IsInteger() const
                virtual Bool_t IsString() const
                virtual Bool_t Notify()
                 virtual char* PrintValue(Int_t mode = 0) const
                 virtual char* PrintValue(Int_t mode, Int_t instance) const
                  virtual void SetAxis(TAxis* axis = 0)
                  virtual void SetTree(TTree* tree)
                  virtual void ShowMembers(TMemberInspector& insp, char* parent)
                  virtual void Streamer(TBuffer& b)
                          void StreamerNVirtual(TBuffer& b)
                  virtual void UpdateFormulaLeaves()

### Data Members

        protected:

                        TTree* fTree                    ! pointer to Tree
                       Short_t fCodes[200]              List of leaf numbers referenced in formula
                         Int_t fNdata[200]              ! This caches the physical number of element in the leaf or datamember.
                         Int_t fNcodes                  Number of leaves referenced in formula
                        Bool_t fHasCast                 Record whether the formula contain a cast operation or not
                         Int_t fMultiplicity            Indicator of the variability of the formula
                         Int_t fNindex                  Size of fIndex
                        Int_t* fLookupType              [fNindex] array indicating how each leaf should be looked-up
                     TObjArray fLeaves                  !  List of leaf used in this formula.
                     TObjArray fDataMembers             !  List of leaf data members
                     TObjArray fMethods                 !  List of leaf method calls
                     TObjArray fAliases                 !  List of TTreeFormula for each alias used.
                     TObjArray fLeafNames               List of TNamed describing leaves
                         Int_t fNdimensions[200]        Number of array dimensions in each leaf
                         Int_t fFixedSizes[200][5]      Physical sizes of lower dimensions for each leaf
                       UChar_t fHasMultipleVarDim[200]  True if the corresponding variable is an array with more than one variable dimension.
                         Int_t fCumulSizes[200][5]      Accumulated sizes of lower dimensions for each leaf after variable dimensions has been calculated
                         Int_t fIndexes[200][5]         Index of array selected by user for each leaf
                 TTreeFormula* fVarIndexes[200][5]      Pointer to a variable index.
                        TList* fDimensionSetup          ! list of dimension setups, for delayed creation of the dimension information.
                        TAxis* fAxis                    ! pointer to histogram axis if this is a string
          TTreeFormulaManager* fManager                 ! The dimension coordinator.

        public:

          static const enum TTreeFormula:: kIsCharacter
          static const enum TTreeFormula:: kDirect
          static const enum TTreeFormula:: kDataMember
          static const enum TTreeFormula:: kMethod
          static const enum TTreeFormula:: kIndexOfEntry
          static const enum TTreeFormula:: kEntries
          static const enum TTreeFormula:: kLength
          static const enum TTreeFormula:: kIteration
          static const enum TTreeFormula:: kAlias
          static const enum TTreeFormula:: kAliasString
          static const enum TTreeFormula:: kAlternate
          static const enum TTreeFormula:: kAlternateString

## Class Description

     TTreeFormula now relies on a variety of TFormLeafInfo classes to handle the
     reading of the information.  Here is the list of theses classes:
       TFormLeafInfo
       TFormLeafInfoDirect
       TFormLeafInfoNumerical
       TFormLeafInfoClones
       TFormLeafInfoCollection
       TFormLeafInfoPointer
       TFormLeafInfoMethod
       TFormLeafInfoMultiVarDim
       TFormLeafInfoMultiVarDimDirect
       TFormLeafInfoCast

     The following method are available from the TFormLeafInfo interface:

      AddOffset(Int_t offset, TStreamerElement* element)
      GetCounterValue(TLeaf* leaf) : return the size of the array pointed to.
      GetObjectAddress(TLeafElement* leaf) : Returns the the location of the object pointed to.
      GetMultiplicity() : Returns info on the variability of the number of elements
      GetNdata(TLeaf* leaf) : Returns the number of elements
      GetNdata() : Used by GetNdata(TLeaf* leaf)
      GetValue(TLeaf *leaf, Int_t instance = 0) : Return the value
      GetValuePointer(TLeaf *leaf, Int_t instance = 0) : Returns the address of the value
      GetLocalValuePointer(TLeaf *leaf, Int_t instance = 0) : Returns the address of the value of 'this' LeafInfo
      IsString()
      ReadValue(char *where, Int_t instance = 0) : Internal function to interpret the location 'where'
      Update() : react to the possible loading of a shared library.

TTreeFormula(): TFormula()

    *-*-*-*-*-*-*-*-*-*-*Tree Formula default constructor*-*-*-*-*-*-*-*-*-*
    *-*                  ================================

TTreeFormula(const char *name,const char *expression, TTree *tree) :TFormula()

    *-*-*-*-*-*-*-*-*-*-*Normal Tree Formula constructor*-*-*-*-*-*-*-*-*-*-*
    *-*                  ===============================

~TTreeFormula()

    *-*-*-*-*-*-*-*-*-*-*Tree Formula default destructor*-*-*-*-*-*-*-*-*-*-*
    *-*                  =================================

void DefineDimensions(Int_t code, Int_t size, TFormLeafInfoMultiVarDim * info, Int_t& virt_dim)

     This method is used internally to decode the dimensions of the variables

Int_t RegisterDimensions(const char *info, Int_t code)

     This method is used internally to decode the dimensions of the variables

Int_t RegisterDimensions(Int_t code, Int_t size, TFormLeafInfoMultiVarDim * multidim)

     This method stores the dimension information for later usage.

Int_t RegisterDimensions(Int_t code, TFormLeafInfo *leafinfo)

     This method is used internally to decode the dimensions of the variables

Int_t RegisterDimensions(Int_t code, TBranchElement *branch)

     This method is used internally to decode the dimensions of the variables

Int_t RegisterDimensions(Int_t code, TLeaf *leaf)

     This method is used internally to decode the dimensions of the variables

Int_t DefinedVariable(TString &name, Int_t &action)

    *-*-*-*-*-*Check if name is in the list of Tree/Branch leaves*-*-*-*-*
    *-*        ==================================================

       This member function redefines the function in TFormula
       If a leaf has a name corresponding to the argument name, then
       returns a new code.
       A TTreeFormula may contain more than one variable.
       For each variable referenced, the pointers to the corresponding
       branch and leaf is stored in the object arrays fBranches and fLeaves.

       name can be :
          - Leaf_Name (simple variable or data member of a ClonesArray)
          - Branch_Name.Leaf_Name
          - Branch_Name.Method_Name
          - Leaf_Name[index]
          - Branch_Name.Leaf_Name[index]
          - Branch_Name.Leaf_Name[index1]
          - Branch_Name.Leaf_Name[][index2]
          - Branch_Name.Leaf_Name[index1][index2]
       New additions:
          - Branch_Name.Leaf_Name[OtherLeaf_Name]
          - Branch_Name.Datamember_Name
          - '.' can be replaced by '->'
       and
          - Branch_Name[index1].Leaf_Name[index2]
          - Leaf_name[index].Action().OtherAction(param)
          - Leaf_name[index].Action()[val].OtherAction(param)

       The expected returns values are
         -2 :  the name has been recognized but won't be usable
         -1 :  the name has not been recognized
        >=0 :  the name has been recognized, return the internal code for this name.

TLeaf* GetLeafWithDatamember(const char* topchoice, const char* nextchoice, UInt_t readentry) const

Bool_t BranchHasMethod(TLeaf* leafcur, TBranch * branch, const char* method, const char* params, UInt_t readentry) const

     Return the leaf (if any) of the tree with contains an object of a class
     having a method which has the name provided in the argument.

Int_t GetRealInstance(Int_t instance, Int_t codeindex)

TClass* EvalClass() const

    *-*-*-*-*-*-*-*-*-*-*Evaluate the class of this treeformula*-*-*-*-*-*-*-*-*-*
    *-*                  ======================================

      If the 'value' of this formula is a simple pointer to an object,
      this function returns the TClass corresponding to its type.

void* EvalObject(int instance)

    *-*-*-*-*-*-*-*-*-*-*Evaluate this treeformula*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
    *-*                  =========================

      Return the address of the object pointed to by the formula.
      Return 0 if the formula is not a single object
      The object type can be retrieved using by call EvalClass();

const char* EvalStringInstance(Int_t instance)

Double_t EvalInstance(Int_t instance, const char *stringStackArg[])

    *-*-*-*-*-*-*-*-*-*-*Evaluate this treeformula*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
    *-*                  =========================

TFormLeafInfo* GetLeafInfo(Int_t code) const

    *-*-*-*-*-*-*-*Return DataMember corresponding to code*-*-*-*-*-*
    *-*            =======================================

      function called by TLeafObject::GetValue
      with the value of fLookupType computed in TTreeFormula::DefinedVariable

TLeaf* GetLeaf(Int_t n) const

    *-*-*-*-*-*-*-*Return leaf corresponding to serial number n*-*-*-*-*-*
    *-*            ============================================

TMethodCall* GetMethodCall(Int_t code) const

    *-*-*-*-*-*-*-*Return methodcall corresponding to code*-*-*-*-*-*
    *-*            =======================================

      function called by TLeafObject::GetValue
      with the value of fLookupType computed in TTreeFormula::DefinedVariable

Int_t GetNdata()

    *-*-*-*-*-*-*-*Return number of available instances in the formula-*-*-*-*-*-*
    *-*            ===================================================

Double_t GetValueFromMethod(Int_t i, TLeaf *leaf) const

    *-*-*-*-*-*-*-*Return result of a leafobject method*-*-*-*-*-*-*-*
    *-*            ====================================

void* GetValuePointerFromMethod(Int_t i, TLeaf *leaf) const

    *-*-*-*-*-*-*-*Return result of a leafobject method*-*-*-*-*-*-*-*
    *-*            ====================================

Bool_t IsInteger() const

     return TRUE if the formula corresponds to one single Tree leaf
     and this leaf is short, int or unsigned short, int
     When a leaf is of type integer, the generated histogram is forced
     to have an integer bin width

Bool_t IsLeafInteger(Int_t code) const

     return TRUE if the leaf corresponding to code is short, int or unsigned
     short, int When a leaf is of type integer, the generated histogram is
     forced to have an integer bin width

Bool_t IsString() const

     return TRUE if the formula is a string

Bool_t IsString(Int_t oper) const

     (fOper[i]>=105000 && fOper[i]<110000) || fOper[i] == kStrings)

Bool_t IsLeafString(Int_t code) const

     return TRUE if the leaf or data member corresponding to code is a string

char* PrintValue(Int_t mode) const

    *-*-*-*-*-*-*-*Return value of variable as a string*-*-*-*-*-*-*-*
    *-*            ====================================

          mode = -2 : Print line with ***
          mode = -1 : Print column names
          mode = 0  : Print column values

char* PrintValue(Int_t mode, Int_t instance) const

    *-*-*-*-*-*-*-*Return value of variable as a string*-*-*-*-*-*-*-*
    *-*            ====================================

          mode = -2 : Print line with ***
          mode = -1 : Print column names
          mode = 0  : Print column values

void SetAxis(TAxis *axis)

void Streamer(TBuffer &R__b)

     Stream an object of class TTreeFormula.

void UpdateFormulaLeaves()

     this function is called TTreePlayer::UpdateFormulaLeaves, itself
     called by TChain::LoadTree when a new Tree is loaded.
     Because Trees in a TChain may have a different list of leaves, one
     must update the leaves numbers in the TTreeFormula used by the TreePlayer.

void ResetDimensions()

     Populate the TTreeFormulaManager with the dimension information.

Bool_t LoadCurrentDim()

void Convert(UInt_t oldversion)

     Convert the fOper of a TTTreeFormula version fromVersion to the current in memory version

### Inline Functions

                   TTreeFormula& operator=(const TTreeFormula&)
                    TTreeFormula TTreeFormula(const char* name, const char* formula, TTree* tree)
            TTreeFormulaManager* GetManager() const
                           Int_t GetMultiplicity() const
                           Int_t GetNcodes() const
                          Bool_t Notify()
                            void SetTree(TTree* tree)
                         TClass* Class()
                         TClass* IsA() const
                            void ShowMembers(TMemberInspector& insp, char* parent)
                            void StreamerNVirtual(TBuffer& b)

Author: Rene Brun 19/01/96
Last update: root/treeplayer:$Name: $:$Id: TTreeFormula.cxx,v 1.148 2004/06/17 17:37:10 brun Exp $
Copyright (C) 1995-2000, Rene Brun and Fons Rademakers. *