library: libTree
#include "TBasket.h"

TBasket

class description - header file - source file - inheritance tree (.pdf)

class TBasket : public TKey

Inheritance Chart:

TObject

TNamed

TKey

TBasket

TBasketSQL


    public:

                      TBasket()
                      TBasket(TDirectory* motherDir)
                      TBasket(const char* name, const char* title, TBranch* branch)
                      TBasket(const TBasket&)
              virtual ~TBasket()
         virtual void AdjustSize(Int_t newsize)
       static TClass* Class()
             Long64_t CopyTo(TFile* to)
         virtual void DeleteEntryOffset()
        virtual Int_t DropBuffers()
             TBranch* GetBranch() const
                Int_t GetBufferSize() const
               Int_t* GetDisplacement() const
               Int_t* GetEntryOffset() const
                Int_t GetEntryPointer(Int_t Entry)
                Int_t GetLast() const
                Int_t GetNevBuf() const
                Int_t GetNevBufSize() const
      virtual TClass* IsA() const
                Int_t LoadBasketBuffers(Long64_t pos, Int_t len, TFile* file)
         virtual void MoveEntries(Int_t dentries)
         virtual void PrepareBasket(Long64_t)
                Int_t ReadBasketBuffers(Long64_t pos, Int_t len, TFile* file)
                Int_t ReadBasketBytes(Long64_t pos, TFile* file)
                 void SetBranch(TBranch* branch)
                 void SetNevBufSize(Int_t n)
         virtual void SetReadMode()
         virtual void SetWriteMode()
         virtual void ShowMembers(TMemberInspector& insp, char* parent)
         virtual void Streamer(TBuffer& b)
                 void StreamerNVirtual(TBuffer& b)
                 void Update(Int_t newlast)
         virtual void Update(Int_t newlast, Int_t skipped)
        virtual Int_t WriteBuffer()

Data Members


    protected:

         Int_t fBufferSize    fBuffer length in bytes
         Int_t fNevBufSize    Length in Int_t of fEntryOffset OR fixed length of each entry if fEntryOffset is null!
         Int_t fNevBuf        Number of entries in basket
         Int_t fLast          Pointer to last used byte in basket
        Bool_t fHeaderOnly    True when only the basket header must be read/written
        Int_t* fDisplacement  ![fNevBuf] Displacement of entries in fBuffer(TKey)
        Int_t* fEntryOffset   [fNevBuf] Offset of entries in fBuffer(TKey)
      TBranch* fBranch        Pointer to the basket support branch

Class Description

_______________________________________________________________________

  Manages buffers for branches of a Tree.
  See picture in TTree.

TBasket()

 Default contructor.

TBasket(TDirectory *motherDir)

 Simple Constructor.

TBasket(const char *name, const char *title, TBranch *branch)

 Basket normal constructor.

~TBasket()

 Basket destructor.

void AdjustSize(Int_t newsize)

 Increase the size of the current fBuffer up to newsize.

Long64_t CopyTo(TFile *to)

 Copy the basket of this branch onto the file to.

void DeleteEntryOffset()

  Delete fEntryOffset array.

Int_t DropBuffers()

 Drop buffers of this basket if it is not the current basket.

Int_t GetEntryPointer(Int_t entry)

 Get pointer to buffer for internal entry.

Int_t LoadBasketBuffers(Long64_t pos, Int_t len, TFile *file)

 Load basket buffers in memory without unziping.
 This function is called by TTreeCloner.
 The function returns 0 in case of success, 1 in case of error.

void MoveEntries(Int_t dentries)

 Remove the first dentries of this basket, moving entries at
 dentries to the start of the buffer.

Int_t ReadBasketBuffers(Long64_t pos, Int_t len, TFile *file)

 Read basket buffers in memory and cleanup.

 Read a basket buffer. Check if buffers of previous ReadBasket
 should not be dropped. Remember, we keep buffers in memory up to
 fMaxVirtualSize.
 The function returns 0 in case of success, 1 in case of error

Int_t ReadBasketBytes(Long64_t pos, TFile *file)

 Read basket buffers in memory and cleanup

 Read first bytes of a logical record starting at position pos
 return record length (first 4 bytes of record).

void SetReadMode()

 Set read mode of basket.

void SetWriteMode()

 Set write mode of basket.

void Streamer(TBuffer &b)

 Stream a class object.

void Update(Int_t offset, Int_t skipped)

 Update basket header and EntryOffset table.

Int_t WriteBuffer()

 Write buffer of this basket on the current file.

 The function returns the number of bytes committed to the memory.
 If a write error occurs, the number of bytes returned is -1.
 If no data are written, the number of bytes returned is 0.

TBasket()

Int_t GetBufferSize()

Int_t GetNevBuf()

Int_t GetNevBufSize()

Int_t GetLast()

void SetBranch(TBranch *branch)

void SetNevBufSize(Int_t n)

void Update(Int_t newlast)

Author: Rene Brun 19/01/96
Last update: root/tree:$Name: $:$Id: TBasket.cxx,v 1.43 2006/07/03 08:11:33 brun Exp $
Copyright (C) 1995-2000, Rene Brun and Fons Rademakers. *

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