// @(#)root/tree:$Id: TChainElement.cxx 20882 2007-11-19 11:31:26Z rdm $
// Author: Rene Brun   11/02/97

/*************************************************************************
 * Copyright (C) 1995-2000, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/

//////////////////////////////////////////////////////////////////////////
//                                                                      //
// A TChainElement describes a component of a TChain.                   //
//                                                                      //
//////////////////////////////////////////////////////////////////////////

#include "TTree.h"
#include "TChainElement.h"

ClassImp(TChainElement)

//______________________________________________________________________________
TChainElement::TChainElement() : TNamed(),fBaddress(0),fBaddressType(0),
                                 fBaddressIsPtr(kFALSE), fBranchPtr(0)
{
   // Default constructor for a chain element.

   fNPackets   = 0;
   fPackets    = 0;
   fEntries    = 0;
   fPacketSize = 100;
   fStatus     = -1;
   ResetBit(kHasBeenLookedUp);
}

//______________________________________________________________________________
TChainElement::TChainElement(const char *name, const char *title)
   :TNamed(name,title),fBaddress(0),fBaddressType(0),
    fBaddressIsPtr(kFALSE), fBranchPtr(0)
{
   // Create a chain element.

   fNPackets   = 0;
   fPackets    = 0;
   fEntries    = 0;
   fPacketSize = 100;
   fStatus     = -1;
   ResetBit(kHasBeenLookedUp);
}

//______________________________________________________________________________
TChainElement::~TChainElement()
{
   // Default destructor for a chain element.

   delete [] fPackets;
}

//_______________________________________________________________________
void TChainElement::CreatePackets()
{
   // Initialize the packet descriptor string.

   fNPackets = 1 + Int_t(fEntries/fPacketSize);
   delete [] fPackets;
   fPackets = new char[fNPackets+1];
   for (Int_t i=0;i<fNPackets;i++) fPackets[i] = ' ';
   fPackets[fNPackets] = 0;

}

//_______________________________________________________________________
void TChainElement::ls(Option_t *) const
{
   // List files in the chain.

   printf("%s tree:%s entries=%lld\n",GetTitle(),GetName(),fEntries);
}

//_______________________________________________________________________
void TChainElement::SetPacketSize(Int_t size)
{
   // Set number of entries per packet for parallel root.

   fPacketSize = size;
}

//_______________________________________________________________________
void TChainElement::SetLookedUp(Bool_t y)
{
   // Set/Reset the looked-up bit
   if (y)
      SetBit(kHasBeenLookedUp);
   else
      ResetBit(kHasBeenLookedUp);
}